Service Manual2005 Diagnostic Trouble Code (DTC) P0301

Evanda

Diagnostic Trouble Code (DTC) P0301

Cylinder 1 Misfire

System Description

The Engine Control Module (ECM) monitors the crankshaft and camshaft positions to detect if the engine is misfiring. The ECM looks for a quick drop in crankshaft speed. This test is executed in blocks of 100 engine revolution tests. It may take between one to several tests to store a Diagnostic Trouble Code (DTC) and illuminate the Malfunction Indicator Lamp (MIL). Under light misfire conditions, it may also take more than one trip to set a DTC. Severe misfire will flash the MIL, indicating that catalyst damage is possible.

Conditions for Setting the DTC

Emission threshold is 0.3% for manual and automatic transaxle.
20 engine cycles have occurred since cranking has started.
A/C compressor clutch has not just engaged or disengaged.
Engine load and engine speed is in a detectable region and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchronization.
Exhaust Gas Recirculation (EGR) flow diagnostic is not in progress.
Fuel level is greater than 12% of rated tank capacity.
Decel Fuel Cutoff (DFCO) not active.
Fuel is not shutoff from high engine speed of 6500 rpm for manual transaxle vehicle or 6500 rpm in drive and 6250 rpm in park for automatic vehicles.
Fuel is not shutoff at 255 km/h (158 mph).
Throttle position change is less than 3% per 125 ms.
Vehicle has not encountered an abusive engine speed of 7000 rpm.
Crankshaft speed patterns are normal.
Throttle position is less than 4% when vehicle speed is greater than 10 km/h (6 mph).
Engine speed is between 600 and 6500 rpm.
Vehicle voltage is between 11 and 16 volts.
Engine Coolant Temperature (ECT) is between -7 °C(20 °F) and 120 °C(248 °F).
The engine speed is less than or equal to 1800 rpm or the crank angle sensing error has not been learned.
There is the correct ratio between Crankshaft Position (CKP) sensor pulses and CMP sensor pulses.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0336, P0337 and P0502 are not set.

Action Taken When the DTC Sets

The MIL will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.

The MIL will illuminate immediately and flash if misfire is present.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault within the freeze frame conditions that the DTC failed.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

An intermittent can also be the result of a defective reluctor wheel. Remove the CKP sensor and inspect the reluctor wheel through the sensor mount hole. Check for porosity and the condition of wheel. If the DTC is intermittent refer to "Symptoms Diagnosis" in this section.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
A visual/physical inspection should include checking the following components:

The wiring for proper connections, pinches or cuts.
The ECM grounds for being clean and tight.
The vacuum hoses for splits, kinks, and proper connections as shown on the Vehicle Emission Information label.
Check thoroughly for any type of leak or restriction.
For air leaks at the throttle body mounting area and intake manifold sealing surfaces.

When all the accumulators are relatively equal, then the misfire is being caused by something that affects the entire engine. When they are not then the misfire is being caused by something that is specific to two or more cylinders.
Whenever the misfire is not present operating the vehicle may be necessary to duplicate the conditions in the Freeze Frame Data in order to detect misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. Whenever the misfire accumulators start to increment, then misfire is present. A history misfire counter will store the number of misfires that have occurred until the DTC is cleared.
Check the fuel for water, alcohol, etc.
A basic engine problem that affects all cylinders is the only possibility at this point. (Cam timing, throttle body leak, restricted air flow, etc.)
Tests the ignition system voltage output using a spark tester.
Replace any spark plugs that are worn, cracked or fouled.
Checks for voltage at the ignition feed circuit.
Whenever the driver circuit is shorted to ground, the light will be on steady. When the driver circuit is shorted to voltage or open, the light will be off.
Since voltage is supplied to the fuel injector on a single circuit, the malfunction could only be a poor connection or open in the fuel injector harness. An open before the harness would result in an "Engine Cranks But Will Not Run" complaint.
Before replacing the ECM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0301 - Cylinder 1 Misfire

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC) Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P0201 or P300 set?	-	Go to applicable DTC	Go to Step 3
3	Perform a visual/physical inspection. Make any repairs that are necessary. Is the repair complete?	-	Go to Step 27	Go to Step 4
4	Start the engine and allow it to idle. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to Step 6
5	Are all counters equal (within a percentage of each other)?	-	Go to Step 7	Go to Step 11
6	Turn the ignition ON, with the engine OFF. Review the Freeze Frame data, and note the parameters. Operate the vehicle within the Freeze Frame conditions and conditions for setting this DTC as noted. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to "Diagnostic Aids"
7	Turn the engine OFF. Install a fuel pressure gauge to the fuel rail. Observe the fuel pressure with the engine running. Is the fuel pressure within the specified value?	284-325 kPa (41-47 psi)	Go to Step 8	Go to "Fuel System Diagnosis"
8	Check the fuel for contamination. Is the fuel OK?	-	Go to Step 9	Go to Step 10
9	Check for a basic engine problem and repair as necessary. Is the repair complete?	-	Go to Step 27	-
10	Replace the contaminated fuel. Is the repair complete?	-	Go to Step 27	-
11	Turn the engine OFF. Disconnect the fuel injector harness connector. Install a spark tester on cylinder #1 spark plug cable. Crank the engine and check for spark. Is a spark observed on all four spark plug cables?	-	Go to Step 12	Go to Step 20
12	Replace the malfunctioning spark plug. Is the repair complete?	-	Go to Step 27	Go to Step 13
13	Turn the engine OFF. Disconnect the cylinder #1 fuel injector connectors from the injector. Install an injector test light on the injector harness connector, terminal 2. Crank the engine and note the test light. Does the injector test light blink?	-	Go to Step 14	Go to Step 15
14	Perform the Fuel Injector Balance Test. Are the fuel injectors OK?	-	Go to Step 9	Go to Step 16
15	Disconnect the injector test light. With a test light connected to ground, probe the ignition feed terminal 1 of the injector harness connector. Crank the engine. Does the test light illuminate?	-	Go to Step 17	Go to Step 19
16	Replace the malfunctioning fuel injector. Is the repair complete?	-	Go to Step 26	-
17	Check the affected fuel injector driver circuit for an open, short, or short to voltage. Is a problem found?	-	Go to Step 18	Go to Step 24
18	Repair the open or the shorted fuel injector driver circuit. Is the repair complete?	-	Go to Step 27	-
19	Repair the open ignition feed circuit between the fuel injector harness connector and the fuel injector connector. Is the repair complete?	-	Go to Step 27	-
20	Measure the resistance of the spark plug cable. Is the resistance of the spark plug cable less than the specified value?	30,000 Ω	Go to Step 21	Go to Step 25
21	Inspect the Engine Control Module (ECM) connector and connections. Are the connections OK?	-	Go to Step 22	Go to Step 23
22	Check the affected cylinders ignition control circuit for an open or short and repair as needed. Is the repair complete?	-	Go to Step 27	Go to Step 26
23	Repair the connector or connections. Is the repair complete?	-	Go to Step 27	-
24	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 27	-
25	Replace the spark plug cable. Is the action complete?	-	Go to Step 27	-
26	Replace the faulty ignition coil. Is the repair complete?	-	Go to Step 27	Go to Step 24
27	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 28	Go to Step 2
28	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0302

Cylinder 2 Misfire

System Description

Conditions for Setting the DTC

Emission threshold is 3.0% for manual and automatic transaxle.
20 engine cycles have occurred since cranking has started.
A/C compressor clutch has not just engaged or disengaged.
Engine load and engine speed is in a detectable region and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchronization.
Exhaust Gas Recirculation (EGR) flow diagnostic is not in progress.
Fuel level is greater than 12% of rated tank capacity.
Decel Fuel Cutoff (DFCO) not active.
Fuel is not shutoff from high engine speed of 6500 rpm for manual transaxle vehicle or 6500 rpm in drive and 6250 rpm in park for automatic transaxle vehicles.
Fuel is not shutoff at 255 km/h (158 mph).
Throttle position change is less than 3% per 125 ms.
Vehicle has not encountered an abusive engine speed of 7000 rpm.
Crankshaft speed patterns are normal.
Throttle position is less than 4% when vehicle speed is greater than 10 km/h (6 mph).
Engine speed is between 600 and 6500 rpm.
Vehicle voltage is between 11 and 16 volts.
Engine Coolant Temperature (ECT) is between -7 °C (20 °F) and 120 °C(248 °F).
The engine speed is less than or equal to 1800 rpm or the crank angle sensing error has not been learned.
There is the correct ratio between Crankshaft Position (CKP) sensor pulses and CMP sensor pulses.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0336, P0337 and P0502 are not set.

Action Taken When the DTC Sets

The MIL will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.

The MIL will illuminate immediately and flash if misfire is present.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault within the freeze frame conditions that the DTC failed.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
A visual/physical inspection should include checking the following components:

The wiring for proper connections, pinches or cuts.
The ECM grounds for being clean and tight.
The vacuum hoses for splits, kinks, and proper connections as shown on the Vehicle Emission Information label. Check thoroughly for any type of leak or restriction.
For air leaks at the throttle body mounting area and intake manifold sealing surfaces.

When all the accumulators are relatively equal, then the misfire is being caused by something that affects the entire engine. When they are not then the misfire is being caused by something that is specific to two or more cylinders.
Whenever the misfire is not present operating the vehicle may be necessary to duplicate the conditions in the Freeze Frame Data in order to detect misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. Whenever the misfire accumulators start to increment, then misfire is present. A history misfire counter will store the number of misfires that have occurred until the DTC is cleared.
Check the fuel for water, alcohol, etc.
A basic engine problem that affects all cylinders is the only possibility at this point. (Cam timing, throttle body leak, restricted air flow, etc.)
Tests the ignition system voltage output using a spark tester.
Replace any spark plugs that are worn, cracked or fouled.
Checks for voltage at the ignition feed circuit.
Whenever the driver circuit is shorted to ground, the light will be on steady. When the driver circuit is shorted to voltage or open, the light will be off.
Since voltage is supplied to the fuel injector on a single circuit, the malfunction could only be a poor connection or open in the fuel injector harness. An open before the harness would result in an "Engine Cranks But Will Not Run" complaint.
Before replacing the ECM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. The replacement ECM must be programmed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0302 - Cylinder 2 Misfire

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check complete?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P0202 or P300 set?	-	Go to applicable DTC	Go to Step 3
3	Perform a visual/physical inspection. Make any repairs that are necessary. Is the repair complete?	-	Go to Step 27	Go to Step 4
4	Start the engine and allow it to idle. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to Step 6
5	Are all counters equal (within a percentage of each other)?	-	Go to Step 7	Go to Step 11
6	Turn the ignition ON, with the engine OFF. Review the Freeze Frame data, and note the parameters. Operate the vehicle within the Freeze Frame conditions and conditions for setting this DTC as noted. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to "Diagnostic Aids"
7	Turn the engine OFF. Install a fuel pressure gauge to the fuel rail. Observe the fuel pressure with the engine running. Is the fuel pressure within the specified value?	284-325 kPa (41-47 psi)	Go to Step 8	Go to "Fuel System Diagnosis"
8	Check the fuel for contamination. Is the fuel OK?	-	Go to Step 9	Go to Step 10
9	Check for a basic engine problem and repair as necessary. Is the repair complete?	-	Go to Step 27	-
10	Replace the contaminated fuel. Is the repair complete?	-	Go to Step 27	-
11	Turn the engine OFF. Disconnect the fuel injector harness connector. Install a spark tester on cylinder #2 spark plug cable. Crank the engine and check for spark. Is a spark observed on all four spark plug cables?	-	Go to Step 12	Go to Step 20
12	Replace the malfunctioning spark plug. Is the repair complete?	-	Go to Step 27	Go to Step 13
13	Turn the engine OFF. Disconnect the cylinder #2 fuel injector connectors from the injector. Install an injector test light on the injector harness connector, terminal 2. Crank the engine and note the test light. Does the injector test light blink?	-	Go to Step 14	Go to Step 15
14	Perform the Fuel Injector Balance Test. Are the fuel injectors OK?	-	Go to Step 9	Go to Step 16
15	Disconnect the injector test light. With a test light connected to ground, probe the ignition feed terminal 1 of the injector harness connector. Crank the engine. Does the test light illuminate?	-	Go to Step 17	Go to Step 19
16	Replace the malfunctioning fuel injector. Is the repair complete?	-	Go to Step 27	-
17	Check the affected fuel injector driver circuit for an open, short, or short to voltage. Is a problem found?	-	Go to Step 18	Go to Step 24
18	Repair the open or the shorted fuel injector driver circuit. Is the repair complete?	-	Go to Step 27	-
19	Repair the open ignition feed circuit between the fuel injector harness connector and the fuel injector connector. Is the repair complete?	-	Go to Step 27	-
20	Measure the resistance of the spark plug cable. Is the resistance of the spark plug cable less than the specified value?	30,000 Ω	Go to Step 21	Go to Step 25
21	Inspect the Engine Control Module (ECM) connector and connections. Are the connections OK?	-	Go to Step 22	Go to Step 23
22	Check the affected cylinders ignition control circuit for an open or short and repair as needed. Is the repair complete?	-	Go to Step 27	Go to Step 26
23	Repair the connector or connections. Is the repair complete?	-	Go to Step 27	-
24	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 27	-
25	Replace the spark plug cable. Is the repair complete?	-	Go to Step 27	-
26	Replace the faulty ignition coil. Is the repair complete?	-	Go to Step 27	Go to Step 24
27	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 28	Go to Step 2
28	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0303

Cylinder 3 Misfire

System Description

Conditions for Setting the DTC

Emission threshold is 3.0% for manual and automatic transaxle.
20 engine cycles have occurred since cranking has started.
A/C compressor clutch has not just engaged or disengaged.
Engine load and engine speed is in a detectable region and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchronization.
Exhaust Gas Recirculation (EGR) flow diagnostic is not in progress.
Fuel level is greater 12% of rated tank capacity.
Decel Fuel Cutoff (DFCO) not active.
Fuel is not shutoff from high engine speed of 6500 rpm for manual transaxle vehicle or 6500 rpm in drive and 6250 rpm in park for automatic transaxle vehicles.
Fuel is not shutoff at 255 km/h (158 mph).
Throttle position change is less than 3% per 125 ms.
Vehicle has not encountered an abusive engine speed of 7000 rpm.
Crankshaft speed patterns are normal.
Throttle position is less than 4% when vehicle speed is greater than 10 km/h (6 mph).
Engine speed is between 600 and 6500 rpm.
Vehicle voltage is between 11 and 16 volts.
Engine Coolant Temperature (ECT) is between -7 °C (20 °F) and 120 °C(248 °F).
The engine speed is less than or equal to 1800 rpm or the crank angle sensing error has not been learned.
There is the correct ratio between Crankshaft Position (CKP) sensor pulses and CMP sensor pulses.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0336, P0337 and P0502 are not set.

Action Taken When the DTC Sets

The MIL will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.

The MIL will illuminate immediately and flash if misfire is present.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault within the freeze frame conditions that the DTC failed.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
A visual/physical inspection should include checking the following components:

The wiring for proper connections, pinches or cuts.
The ECM grounds for being clean and tight.
The vacuum hoses for splits, kinks, and proper connections as shown on the Vehicle Emission Information label. Check thoroughly for any type of leak or restriction.
For air leaks at the throttle body mounting area and intake manifold sealing surfaces.

When all the accumulators are relatively equal, then the misfire is being caused by something that affects the entire engine. When they are not then the misfire is being caused by something that is specific to two or more cylinders.
Whenever the misfire is not present operating the vehicle may be necessary to duplicate the conditions in the Freeze Frame Data in order to detect misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. Whenever the misfire accumulators start to increment, then misfire is present. A history misfire counter will store the number of misfires that have occurred until the DTC is cleared.
Check the fuel for water, alcohol, etc.
A basic engine problem that affects all cylinders is the only possibility at this point. (Cam timing, throttle body leak, restricted air flow, etc.)
Tests the ignition system voltage output using a spark tester.
Replace any spark plugs that are worn, cracked or fouled.
Checks for voltage at the ignition feed circuit.
Whenever the driver circuit is shorted to ground, the light will be on steady. When the driver circuit is shorted to voltage or open, the light will be off.
Since voltage is supplied to the fuel injector on a single circuit, the malfunction could only be a poor connection or open in the fuel injector harness. An open before the harness would result in an "Engine Cranks But Will Not Run" complaint.
Before replacing the ECM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. The replacement ECM must be programmed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0303 - Cylinder 3 Misfire

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check complete?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P0203 or P300 set?	-	Go to applicable DTC	Go to Step 3
3	Perform a visual/physical inspection. Make any repairs that are necessary. Is the repair complete?	-	Go to Step 27	Go to Step 4
4	Start the engine and allow it to idle. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to Step 6
5	Are all counters equal (within a percentage of each other)?	-	Go to Step 7	Go to Step 11
6	Turn the ignition ON, with the engine OFF. Review the Freeze Frame data, and note the parameters. Operate the vehicle within the Freeze Frame conditions and conditions for setting this DTC as noted. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to "Diagnostic Aids"
7	Turn the engine OFF. Install a fuel pressure gauge to the fuel rail. Observe the fuel pressure with the engine running. Is the fuel pressure within the specified value?	284-325 kPa (41-47 psi)	Go to Step 8	Go to "Fuel System Diagnosis"
8	Check the fuel for contamination. Is the fuel OK?	-	Go to Step 9	Go to Step 10
9	Check for a basic engine problem and repair as necessary. Is the repair complete?	-	Go to Step 27	-
10	Replace the contaminated fuel. Is the repair complete?	-	Go to Step 27	-
11	Turn the engine OFF. Disconnect the fuel injector harness connector. Install a spark tester on cylinder #3 spark plug cable. Crank the engine and check for spark. Is a spark observed on all four spark plug cables?	-	Go to Step 12	Go to Step 20
12	Replace the malfunctioning spark plug. Is the repair complete?	-	Go to Step 27	Go to Step 13
13	Turn the engine OFF. Disconnect the cylinder #3 fuel injector connectors from the injector. Install an injector test light on the injector harness connector, terminal 2. Crank the engine and note the test light. Does the injector test light blink?	-	Go to Step 14	Go to Step 15
14	Perform the Fuel Injector Balance Test. Are the fuel injectors OK?	-	Go to Step 9	Go to Step 16
15	Disconnect the injector test light. With a test light connected to ground, probe the ignition feed terminal 1 of the injector harness connector. Crank the engine. Does the test light illuminate?	-	Go to Step 17	Go to Step 19
16	Replace the malfunctioning fuel injector. Is the repair complete?	-	Go to Step 27	-
17	Check the affected fuel injector driver circuit for an open, short, or short to voltage. Is a problem found?	-	Go to Step 18	Go to Step 24
18	Repair the open or the shorted fuel injector driver circuit. Is the repair complete?	-	Go to Step 27	-
19	Repair the open ignition feed circuit between the fuel injector harness connector and the fuel injector connector. Is the repair complete?	-	Go to Step 27	-
20	Measure the resistance of the spark plug cable. Is the resistance of the spark plug cable less than the specified value?	30,000 Ω	Go to Step 21	Go to Step 25
21	Inspect the Engine Control Module (ECM) connector and connections. Are the connections OK?	-	Go to Step 22	Go to Step 23
22	Check the affected cylinders ignition control circuit for an open or short and repair as needed. Is the repair complete?	-	Go to Step 27	Go to Step 26
23	Repair the connector or connections. Is the repair complete?	-	Go to Step 27	-
24	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 27	-
25	Replace the spark plug cable. Is the repair complete?	-	Go to Step 27	-
26	Replace the faulty ignition coil. Is the repair complete?	-	Go to Step 27	Go to Step 24
27	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 28	Go to Step 2
28	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0304

Cylinder 4 Misfire

System Description

Conditions for Setting the DTC

Emission threshold is 3.0% for manual and automatic transaxle.
20 engine cycles have occurred since cranking has started.
A/C compressor clutch has not just engaged or disengaged.
Engine load and engine speed is in a detectable region and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchronization.
Exhaust Gas Recirculation (EGR) flow diagnostic is not in progress.
Fuel level is greater 12% of rated tank capacity.
Decel Fuel Cutoff (DFCO) not active.
Fuel is not shutoff from high engine speed of 6500 rpm for manual transaxle vehicle or 6500 rpm in drive and 6250 rpm in park for automatic transaxle vehicles.
Fuel is not shutoff at 255 km/h (158 mph).
Throttle position change is less than 3% per 125 ms.
Vehicle has not encountered an abusive engine speed of 7000 rpm.
Crankshaft speed patterns are normal.
Throttle position is less than 4% when vehicle speed is greater than 10 km/h (6 mph).
Engine speed is between 600 and 6500 rpm.
Vehicle voltage is between 11 and 16 volts.
Engine Coolant Temperature (ECT) is between -7 °C (20 °F) and 120 °C(248 °F).
The engine speed is less than or equal to 1800 rpm or the crank angle sensing error has not been learned.
There is the correct ratio between Crankshaft Position (CKP) sensor pulses and CMP sensor pulses.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0336, P0337 and P0502 are not set.

Action Taken When the DTC Sets

The MIL will illuminate after two consecutive ignition cycles in which the diagnostic runs with the fault active.

The MIL will illuminate immediately and flash if misfire is present.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault within the freeze frame conditions that the DTC failed.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
A visual/physical inspection should include checking the following components:

The wiring for proper connections, pinches or cuts.
The ECM grounds for being clean and tight.
The vacuum hoses for splits, kinks, and proper connections as shown on the Vehicle Emission Information label. Check thoroughly for any type of leak or restriction.
For air leaks at the throttle body mounting area and intake manifold sealing surfaces.

When all the accumulators are relatively equal, then the misfire is being caused by something that affects the entire engine. When they are not then the misfire is being caused by something that is specific to two or more cylinders.
Whenever the misfire is not present operating the vehicle may be necessary to duplicate the conditions in the Freeze Frame Data in order to detect misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. Whenever the misfire accumulators start to increment, then misfire is present. A history misfire counter will store the number of misfires that have occurred until the DTC is cleared.
Check the fuel for water, alcohol, etc.
A basic engine problem that affects all cylinders is the only possibility at this point. (Cam timing, throttle body leak, restricted air flow, etc.)
Tests the ignition system voltage output using a spark tester.
Replace any spark plugs that are worn, cracked or fouled.
Checks for voltage at the ignition feed circuit.
Whenever the driver circuit is shorted to ground, the light will be on steady. When the driver circuit is shorted to voltage or open, the light will be off.
Since voltage is supplied to the fuel injector on a single circuit, the malfunction could only be a poor connection or open in the fuel injector harness. An open before the harness would result in an "Engine Cranks But Will Not Run" complaint.
Before replacing the ECM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. The replacement ECM must be programmed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0304 - Cylinder 4 Misfire

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check complete?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P0201 or P300 set?	-	Go to applicable DTC	Go to Step 3
3	Perform a visual/physical inspection. Make any repairs that are necessary. Is the repair complete?	-	Go to Step 27	Go to Step 4
4	Start the engine and allow it to idle. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to Step 6
5	Are all counters equal (within a percentage of each other)?	-	Go to Step 7	Go to Step 11
6	Turn the ignition ON, with the engine OFF. Review the Freeze Frame data, and note the parameters. Operate the vehicle within the Freeze Frame conditions and conditions for setting this DTC as noted. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to "Diagnostic Aids"
7	Turn the engine OFF. Install a fuel pressure gauge to the fuel rail. Observe the fuel pressure with the engine running. Is the fuel pressure within the specified value?	284-325 kPa (41-47 psi)	Go to Step 8	Go to "Fuel System Diagnosis"
8	Check the fuel for contamination. Is the fuel OK?	-	Go to Step 9	Go to Step 10
9	Check for a basic engine problem and repair as necessary. Is the repair complete?	-	Go to Step 27	-
10	Replace the contaminated fuel. Is the repair complete?	-	Go to Step 27	-
11	Turn the engine OFF. Disconnect the fuel injector harness connector. Install a spark tester on cylinder #4 spark plug cable. Crank the engine and check for spark. Is a spark observed on all four spark plug cables?	-	Go to Step 12	Go to Step 20
12	Replace the malfunctioning spark plug. Is the repair complete?	-	Go to Step 27	Go to Step 13
13	Turn the engine OFF. Disconnect the cylinder #4 fuel injector connectors from the injector. Install an injector test light on the injector harness connector, terminal 2. Crank the engine and note the test light. Does the injector test light blink?	-	Go to Step 14	Go to Step 15
14	Perform the Fuel Injector Balance Test. Are the fuel injectors OK?	-	Go to Step 9	Go to Step 16
15	Disconnect the injector test light. With a test light connected to ground, probe the ignition feed terminal 1 of the injector harness connector. Crank the engine. Does the test light illuminate?	-	Go to Step 17	Go to Step 19
16	Replace the malfunctioning fuel injector. Is the repair complete?	-	Go to Step 27	-
17	Check the affected fuel injector driver circuit for an open, short, or short to voltage. Is a problem found?	-	Go to Step 18	Go to Step 24
18	Repair the open or the shorted fuel injector driver circuit. Is the repair complete?	-	Go to Step 27	-
19	Repair the open ignition feed circuit between the fuel injector harness connector and the fuel injector connector. Is the repair complete?	-	Go to Step 27	-
20	Measure the resistance of the spark plug cable. Is the resistance of the spark plug cable less than the specified value?	30,000 Ω	Go to Step 21	Go to Step 25
21	Inspect the Engine Control Module (ECM) connector and connections. Are the connections OK?	-	Go to Step 22	Go to Step 23
22	Check the affected cylinders ignition control circuit for an open or short and repair as needed. Is the repair complete?	-	Go to Step 27	Go to Step 26
23	Repair the connector or connections. Is the repair complete?	-	Go to Step 27	-
24	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 27	-
25	Replace the spark plug cable. Is the repair complete?	-	Go to Step 27	-
26	Replace the faulty ignition coil. Is the repair complete?	-	Go to Step 27	Go to Step 24
27	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 28	Go to Step 2
28	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0313

Misfire Low Fuel Level

System Description

Conditions for Setting the DTC

Emission threshold is 3.0% for manual and automatic transaxle.
20 engine cycles have occurred since cranking has started.
A/C compressor clutch has not just engaged or disengaged.
Engine load and engine speed is in a detectable region and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchronization.
Exhaust Gas Recirculation (EGR) flow diagnostic is not in progress.
This DTC will store a service reference P0300 code when misfire is detected at low fuel levels.
Fuel level is greater than 15% of rated tank capacity.
Decel Fuel Cutoff (DFCO) not active.
Fuel is not shutoff from high engine speed of 6500 rpm for manual transaxle vehicle or 6500 rpm in drive and 6250 rpm in park for automatic transaxle vehicles.
Fuel is not shutoff at 255 km/h (158 mph).
Throttle position change is less than 3% per 125 ms.
Vehicle has not encountered an abusive engine speed of 7000 rpm.
Crankshaft speed patterns are normal.
Throttle position is less than 4% when vehicle speed is greater than 10 km/h (6 mph).
Engine speed is between 600 and 6500 rpm.
Vehicle voltage is between 11 and 16 volts.
Engine Coolant Temperature (ECT) is between -7°C (20°F) and 120°C (248°F).
The engine speed is less than or equal to 1800 rpm or the crank angle sensing error has not been learned.
There is the correct ratio between Crankshaft Position (CKP) sensor pulses and CMP sensor pulses.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0336, P0337 and P0502 are not set.

Action Taken When the DTC Sets

The MIL will not illuminate.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault within the freeze frame conditions that the DTC failed.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
A visual/physical inspection should include checking the following components:

The wiring for proper connections, pinches or cuts.
The ECM grounds for being clean and tight.
The vacuum hoses for splits, kinks, and proper connections as shown on the Vehicle Emission Information label. Check thoroughly for any type of leak or restriction.
For air leaks at the throttle body mounting area and intake manifold sealing surfaces.

When all the accumulators are relatively equal, then the misfire is being caused by something that affects the entire engine. When they are not then the misfire is being caused by something that is specific to two or more cylinders.
Whenever the misfire is not present operating the vehicle may be necessary to duplicate the conditions in the Freeze Frame Data in order to detect misfire. Depending on the engine load, the conditions may have to be maintained for up to 20 seconds. Whenever the misfire accumulators start to increment, then misfire is present. A history misfire counter will store the number of misfires that have occurred until the DTC is cleared.
Check fuel for water, alcohol, etc.
A basic engine problem that affects all cylinders is the only possibility at this point. (Cam timing, throttle body leak, restricted air flow, etc.)
Tests the ignition system voltage output using a spark tester.
Replace any spark plugs that are worn, cracked or fouled.
Checks for voltage at the ignition feed circuit.
Whenever the driver circuit is shorted to ground, the light will be on steady. When the driver circuit is shorted to voltage or open, the light will be off.
Since voltage is supplied to the fuel injector on a single circuit, the malfunction could only be a poor connection or open in the fuel injector harness. An open before the harness would result in an "Engine Cranks But Will Not Run" complaint.
Before replacing the ECM, check terminals for improper mating, broken locks, or physical damage to the wiring harness. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0313 - Misfire Low Fuel Level

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P0201, P0202, P0203, P0204 set?	-	Go to applicable DTC	Go to Step 3
3	Perform a visual/physical inspection. Make any repairs that are necessary. Is the repair complete?	-	Go to Step 27	Go to Step 4
4	Start the engine and allow it to idle. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to Step 6
5	Are all counters equal (within a percentage of each other)?	-	Go to Step 7	Go to Step 11
6	Turn the ignition ON, with the engine OFF. Review the Freeze Frame data, and note the parameters. Operate the vehicle within the Freeze Frame conditions and conditions for setting this DTC as noted. Are any Misfire Current counters incrementing?	-	Go to Step 5	Go to "Diagnostic Aids"
7	Turn the engine OFF. Install a fuel pressure gauge to the fuel rail. Observe the fuel pressure with the engine running. Is the fuel pressure within the specified value?	284-325 kPa (41-47 psi)	Go to Step 8	Go to "Fuel System Diagnosis"
8	Check the fuel for contamination. Is the fuel OK?	-	Go to Step 9	Go to Step 10
9	Check for a basic engine problem and repair as necessary. Is the repair complete?	-	Go to Step 27	-
10	Replace the contaminated fuel. Is the repair complete?	-	Go to Step 27	-
11	Turn the engine OFF. Disconnect the fuel injector harness connector. Install a spark tester on cylinder #1 spark plug cable. Crank the engine and check for spark. Repeat the above procedure on cylinders #2, #3 and #4. Is a spark observed on all four spark plug cables?	-	Go to Step 12	Go to Step 20
12	Replace any malfunctioning spark plugs if necessary. Is the repair complete?	-	Go to Step 27	Go to Step 13
13	Turn the engine OFF. Disconnect the fuel injector connectors from the injectors. Install an injector test light on the injector harness connector for the cylinders that had misfired. Crank the engine and note the test light. Does the injector test light blink?	-	Go to Step 14	Go to Step 15
14	Perform the Fuel Injector Balance Test. Are the fuel injectors OK?	-	Go to Step 9	Go to Step 16
15	Disconnect the injector test light. With a test light connected to ground, probe the ignition feed terminal 1 of the injector harness connector for each cylinder that had misfire. Crank the engine. Does the test light illuminate?	-	Go to Step 17	Go to Step 19
16	Replace any malfunctioning fuel injectors. Is the repair complete?	-	Go to Step 27	-
17	Check the affected fuel injector driver circuit at terminals M25, M22, M24, and M11 for an open, short, or short to voltage. Is a problem found?	-	Go to Step 18	Go to Step 24
18	Repair the open or the shorted fuel injector driver circuit. Is the repair complete?	-	Go to Step 26	-
19	Repair the open ignition feed circuit between the fuel injector harness connector and the fuel injector connector. Is the repair complete?	-	Go to Step 27	-
20	Measure the resistance of the spark plug cable that the spark plug tester did not spark. Is the resistance of the spark plug cable less than the specified value?	30,000 Ω	Go to Step 21	Go to Step 25
21	Inspect the Engine Control Module (ECM) connector and connections. Are the connections OK?	-	Go to Step 22	Go to Step 23
22	Check the affected cylinders ignition control circuit for an open or short and repair as necessary. Is the repair complete?	-	Go to Step 27	Go to Step 26
23	Repair the connector or connections. Is the repair complete?	-	Go to Step 27	-
24	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 27	-
25	Replace the spark plug cable. Is the repair complete?	-	Go to Step 27	-
26	Replace the faulty ignition coil. Is the repair complete?	-	Go to Step 27	Go to Step 24
27	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 28	Go to Step 2
28	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0317

Rough Road Sensor Source Not Detected

System Description

The Engine Control Module (ECM) identifies engine misfire by detecting variations in crankshaft speed. Crankshaft speed variations can also occur when a vehicle is operating over a rough road. The ECM receives rough road signal by gravity sensing rough road (G) sensor or Electronic Brake Control Module (EBCM) if equipped with the Anti-Lock Brake System (ABS). The ABS can detect if the vehicle is on the rough surface based on wheel acceleration/deceleration data supplied by each wheel speed sensor. This information sent to the ECM by EBCM through serial data line. The G sensor is vertical low g-acceleration sensor. By sensing vertical acceleration caused by bumps or portholes in the road, the ECM determine if the changes in crankshaft speed are due to engine misfire or are driveline induced. If the ECM can not receive any of those signal, a historic Diagnostic Trouble Code (DTC) will be stored.

Conditions for Setting the DTC

ECM can not detect any rough road source.
Engine run time is greater than or equal to 10 seconds.
Vehicle speed is greater than 5 km/h (3.1 mph).

Action Taken When the DTC Sets

The MIL will not illuminate.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

An open signal circuit of G sensor or open serial data line between the ECM and the EBCM will be the cause of this DTC.

DTC P0317 - Rough Road Sensor Source Not Detected

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check complete?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Request Diagnostic Trouble Codes (DTCs) Are DTCs P1380, P1381, P1391, P1392 or P1393 set?	-	Go to applicable DTC	Go to Step 3
3	Is the vehicle equipped with the Anti-lock Brake System (ABS)?	-	Go to Step 8	Go to Step 4
4	Disconnect the gravity sensing rough road (G) sensor connector. Disconnect the Engine control Module (ECM) connector. Measure resistance between terminal 2 of the G sensor and terminal K21 of the ECM. Is the resistance within the specified value?	0 Ω	Go to Step 6	Go to Step 5
5	Repair open circuit. Is the repair complete?	-	Go to Step 10	Go to Step 6
6	Reconnect the ECM and G sensor connectors. Turn the ignition ON. Probe the voltage at terminal 2 of G sensor. Is the voltage within the specified value?	2.35-2.65 V	Go to Step 9	Go to Step 7
7	Turn the ignition OFF. Replace the G sensor. Is the repair complete?	-	Go to Step 10	-
8	Repair open circuit. Is the repair complete?	-	Go to Step 10	Go to Step 9
9	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 10	-
10	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 11	Go to Step 2
11	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0325

Knock Sensor Internal Malfunction

System Description

The Knock Sensor (KS) system is used to detect engine detonation, allowing the Engine Control Module (ECM) to retard the ignition control spark timing based on the KS signal being received. The KS produces an AC signal so that under a no-knock condition the signal on the KS circuit measures about 0.007 volts AC. The KS signal's amplitude and frequency depend upon the amount of knock being experienced. The ECM contains a nonreplaceable knock filter module called a Digitally Controlled Signal-to-Noise Enhancement Filter (DSNEF) module. This filter module in the ECM determines whether or not knock is occurring by comparing the signal level on the KS circuit with the voltage level on the noise channel. The noise channel allows the ECM to reject any false knock signal by knowing the amount of normal engine mechanical noise present. Normal engine noise varies depending on engine speed and load. When the ECM determines that an abnormally low noise channel voltage level is being experienced, Diagnostic Trouble Code (DTC) P0325 will set.

Conditions for Setting the DTC

DSNEF A/D reading is less than 1.0% or greater than 80% any of the 4 cylinders.
Vacuum is less than the predetermined value (10 to 50 kPa, based on rpm).
The rpm is greater than 1600.
DTCs P0106, P0107, and P0108 are not set.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will not illuminate.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

A history DTC will clear after 40 consecutive warm-up cycles without a fault.
DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Check and correct any abnormal engine noise before using the diagnostic table.

Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions:

Backed-out terminals
Improper mating
Broken locks
Improperly formed
Damaged terminals
Poor terminal-to-wire connection
Physical damage to the wiring harness

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
If the conditions for the test as described above are met, a DTC P0325 will set and MIL will illuminate.
If the engine has an internal knock or audible noise that causes a knocking type noise on the engine block, the knock sensor may be responding to the noise.
The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0325 - Knock Sensor Internal Malfunction

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Clear the Diagnostic Trouble Codes (DTCs). Start the engine. Operate the vehicle within the Conditions for Setting the DTC as noted. Is the DTC set again.	-	Go to Step 3	Go to Step 6
3	Listen to the engine while rising and lowing the engine speed. Is a knock or audible noise present?	-	Go to Step 4	Go to Step 5
4	Repair mechanical engine problem or a loose bracket or components as needed. Is the repair complete?	-	Go to Step 6	-
5	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 6	-
6	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 7	Go to Step 2
7	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0327

Knock Sensor Circuit Fault

System Description

Conditions for Setting the DTC

Minimum difference between cylinders is greater than 0.4%.
Vacuum is less than the predetermined value (10 to 50 kPa, based on rpm).
The rpm is greater than 1600.
DTCs P0106, P0107 and P0108 are not set.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will not illuminate.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

A history DTC will clear after 40 consecutive warm-up cycles without a fault.
DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

Check and correct any abnormal engine noise before using the diagnostic table.

Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions:

Backed-out terminals
Improper mating
Broken locks
Improperly formed
Damaged terminals
Poor terminal-to-wire connection
Physical damage to the wiring harness

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
If the conditions for the test as described above are met, a DTC P0327 will set and MIL will illuminate.
If the engine has an internal knock or audible noise that causes a knocking type noise on the engine block, the KS may be responding to the noise.
Checking the internal resistance of the KS or the wiring to the KS is OK.
Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections or physical damage to the wiring harness.
The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0327 - Knock Sensor Circuit Fault

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Clear the Diagnostic Trouble Codes (DTCs). Start the engine. Operate the vehicle within the Conditions for Setting the DTC as noted. Is the DTC set again.	-	Go to Step 3	Go to Step 6
3	Listen to the engine while rising and lowing the engine speed. Is a knock or audible noise present?	-	Go to Step 4	Go to Step 5
4	Repair mechanical engine problem or a loose bracket or components as needed. Is the repair complete?	-	Go to Step 11	-
5	Turn the ignition OFF. Disconnect the Engine Control Module (ECM) connector. With a ohmmeter connected ground, measure the resistance of the Knock Sensor (KS) through the KS signal circuit, terminal M18. Is the resistance between the specified value?	90-110 kΩ	Go to Step 6	Go to Step 8
6	Check for a poor connection at the ECM connector KS signal circuit and repair as needed. Is the repair complete?	-	Go to Step 11	Go to Step 7
7	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 11	-
8	Check the KS connector for a poor connection and repair as needed. Is the repair complete?	-	Go to Step 11	Go to Step 9
9	Check the KS signal circuit for an open or a short to ground or voltage and repair as needed. Is the repair complete?	-	Go to Step 11	-
10	Turn the ignition OFF. Replace the KS. Is the repair complete?	-	Go to Step 11	-
11	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 12	Go to Step 2
12	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0336

58X Crank Position Sensor Extra/Missing Pulses

Circuit Description

The 58X reference signal is produced by the Crankshaft Position (CKP) sensor. During one crankshaft revolution, 58 crankshaft pulses will be produced. The Engine Control Module (ECM) uses the 58X reference signal to calculate engine rpm and CKP. The ECM constantly monitors the number of pulses on the 58X reference circuit and compares them to the number of Camshaft Position (CMP) signal pulses being received. If the ECM receives and incorrect number of pulses on the 58X reference circuit, Diagnostic Trouble Code (DTC) P0336 will set.

Conditions for Setting the DTC

Engine is running.
Extra or missing pulses detected between consecutive 58X reference pulses.
Number of extra or missing teeth is greater than or equal to 2 per revolution.
Above condition is detected in 10 of 100 crankshaft rotations.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate after three consecutive with a fail.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffer.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn OFF after four consecutive ignition cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
The DTC(s) can be cleared using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation. Check for:

Poor connection - Inspect the ECM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections.
Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ECM, turn the ignition ON and observe a voltmeter connected to the 58X reference circuit at the ECM harness connector while moving the connectors and the wiring harnesses related to the ECM. A change in voltage will indicate the location of the fault.
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

DTC P0336 - 58X Crank Position Sensor Extra/Missing Pulses

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Attempt to start the engine. Does the engine start?	-	Go to Step 3	Go to "Engine Cranks But Will Not Run"
3	Turn the ignition OFF. Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON, with the engine OFF. Review and record Failure Records information. Clear the Diagnostic Trouble Codes (DTCs). Start the engine and idle for 1 minute. Is DTC P0336 set?	-	Go to Step 4	Go to "Diagnostic Aids"
4	Turn the ignition OFF. Disconnect the Engine Control Module (ECM) connector and Crankshaft Position (CKP) sensor. Check for an open or short to ground in the 58X reference circuit between CKP sensor connector and the ECM harness connector. Is a problem found?	-	Go to Step 5	Go to Step 6
5	Repair an open or short to ground in the 58X reference circuit between the CKP sensor connector and the ECM harness connector. Is the repair complete?	-	Go to Step 11	-
6	Reconnect the ECM and CKP sensor. Connect a voltmeter to measure the voltage at terminal M21 of the ECM connector. Observe the voltage while cranking the engine. Is the voltage near the specified value?	1.6 v	Go to Step 9	Go to Step 7
7	Check the connections at CKP sensor and repair or replace the terminals. Is the repair complete?	-	Go to Step 11	Go to Step 8
8	Turn the ignition OFF. Replace the CKP sensor. Is the repair complete?	-	Go to Step 11	-
9	Check the connections at ECM and repair or replace the terminals. Is the repair complete?	-	Go to Step 11	Go to Step 10
10	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 11	-
11	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 12	Go to Step 2
12	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P0337

58X Crank Position Sensor No Signal

Circuit Description

The 58X reference signal is produced by the Crankshaft Position (CKP) sensor. During one crankshaft revolution, 58 crankshaft pulses will be produced. The Engine Control Module (ECM) uses the 58X reference signal to calculate engine rpm and CKP. The ECM constantly monitors the number of pulses on the 58X reference circuit and compares them to the number of Camshaft Position (CMP) signal pulses being received. If the ECM does not receive any 58X reference pulses on the 58X reference circuit while cranking, Diagnostic Trouble Code (DTC) P0337 will set.

Conditions for Setting the DTC

58X reference pulse not seen during cranking.
DTCs P0341 and P0342 are not set.
Change in voltage drop is greater than 0.6 volts and change in Manifold Absolute Pressure (MAP) is greater than 1.2 kPa (0.17 psi) for manual transaxle.
Change in voltage drop is greater than 1.2 volts and change in MAP is greater than 0.8 kpa (0.12 psi) for automatic transaxle.
58X reference pulse not seen for 8 seconds.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffer.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn OFF after four consecutive ignition cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm-up cycles have occurred without a fault.
The DTC(s) can be cleared using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed-through wire insulation or a wire broken inside the insulation. Check for:

Poor connection - Inspect the ECM harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connections.
Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the ECM, turn the ignition ON and observe a voltmeter connected to the 58X reference circuit at the ECM harness connector while moving the connectors and the wiring harnesses related to the ECM. A change in voltage will indicate the location of the fault.
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

DTC P0337 - 58X Crank Position Sensor No Signal

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Turn the ignition OFF. Install a scan tool to the Data Link Connector (DLC). Start the engine. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC as noted. Is Diagnostic Trouble Code (DTC) P0337 set?	-	Go to Step 3	Go to Step 10
3	Turn the ignition OFF. Disconnect the Crankshaft Position (CKP) sensor connector. Turn the ignition ON. Using a voltmeter, check the voltage between the CKP sensor wiring harness connector (Engine Control Module [ECM] side) terminal 1 and ground. Does the voltage within the value specified?	1.4 volts	Go to Step 4	Go to Step 5
4	Using a voltmeter, check the voltage between the CKP sensor wiring harness connector (ECM side) terminal 2 and ground. Does the voltage within the value specified?	1.4 volts	Go to Step 6	Go to Step 5
5	Turn the ignition OFF. Disconnect the ECM connector. Turn the ignition ON. Using a voltmeter, check the out put voltage of the ECM terminal M21 and M5. Does the voltage within the value specified?	11-14 volts	Go to Step 8	Go to Step 9
6	Reconnect the CKP sensor. Using a voltmeter, back probe the ECM connector terminal M21 and M5. Observe the voltage while cranking the engine. Does the voltage fluctuate between the specified value?	1.3-1.6 volts	Go to "Diagnostic Aids"	Go to Step 7
7	Turn the ignition OFF. Replace the CKP sensor. Is the repair complete?	-	Go to Step 10	-
8	Check the CKP sensor high and low circuits for an open, short to ground or voltage and repair as needed. Is the repair complete?	-	Go to Step 10	-
9	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 10	-
10	Using the scan tool, clear the DTCs. Start the engine and idle at normal operating temperature. Operate the vehicle within the conditions for setting this DTC as supported in the text. Does the scan tool indicate that this diagnostic ran and passed?	-	Go to Step 11	Go to Step 2
11	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to "Applicable DTC table"	System OK