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TROUBLE CODE DIAGNOSIS (1.4 SOHC/DOHC)

Clearing Trouble Codes

Notice : To prevent Engine Control Module (ECM) damage, the key must be OFF when disconnecting or reconnecting the power to the ECM (for example battery cable, ECM pigtail connector, ECM fuse, jumper cables, etc.).

When the ECM sets a Diagnostic Trouble Code (DTC), the Malfunction Indicator Lamp (MIL) lamp will be turned on only for type A, B and E but a DTC will be stored in the ECM's memory for all types of DTC. If the problem is intermittent, the MIL will go out after 10 seconds if the fault is no longer present. The DTC will stay in the ECM's memory until cleared by scan tool. Removing battery voltage for 10 seconds will clear some stored DTCs.
DTCs should be cleared after repairs have been completed. Some diagnostic tables will tell you to clear the codes before using the chart. This allows the ECM to set the DTC while going through the chart, which will help to find the cause of the problem more quickly.

Diagnostic Trouble Codes (1.4 SOHC/DOHC)

DTC
Description
Type
Illuminate MIL
P0106
Manifold Absolute Pressure Rationality
E
Yes
P0107
Manifold Absolute Pressure Low Voltage
A
Yes
P0108
Manifold Absolute Pressure High Voltage
A
Yes
P0112
Intake Air Temperature Low Voltage
E
Yes
P0113
Intake Air Temperature High Voltage
E
Yes
P0117
Engine Coolant Temperature Low Voltage
A
Yes
P0118
Engine Coolant Temperature High Voltage
A
Yes
P0122
Throttle Position Sensor Low Voltage
A
Yes
P0123
Throttle Position Sensor High Voltage
A
Yes
P0131
Front Heated Oxygen Sensor (HO2S1) Low Voltage
A
Yes
P0132
Front Heated Oxygen Sensor (HO2S1) High Voltage
A
Yes
P0133
Front Heated Oxygen Sensor (HO2S1) Slow Response
E
Yes
P0134
Front Heated Oxygen Sensor (HO2S1) No Activity or Open
A
Yes
P0135
Front Heated Oxygen Sensor (HO2S1) Heater Circuit Not Functioning
E
Yes
P0137
Rear Heated Oxygen Sensor (HO2S2) Low Voltage
E
Yes
P0138
Rear Heated Oxygen Sensor (HO2S2) High Voltage
E
Yes
P0140
Rear Heated Oxygen Sensor (HO2S2) No Activity or Open
E
Yes
P0141
Rear Heated Oxygen Sensor (HO2S2) Heater Circuit Not Functioning
E
Yes
P0171
Fuel Trim System Too Lean (1.4L SOHC)
B
Yes
.
Fuel Trim System Too Lean (1.4L DOHC)
A
Yes
P0172
Fuel Trim System Too Rich (1.4L SOHC)
B
Yes
.
Fuel Trim System Too Rich (1.4L DOHC)
A
Yes
P0201
Injector 1 Circuit Fault
A
Yes
P0202
Injector 2 Circuit Fault
A
Yes
P0203
Injector 3 Circuit Fault
A
Yes
P0204
Injector 4 Circuit Fault
A
Yes
P0300
Multiple Cylinder Misfire Detected
B
Yes
P0301
Cylinder 1 Misfire
A
Yes
P0302
Cylinder 2 Misfire
A
Yes
P0303
Cylinder 3 Misfire
A
Yes
P0304
Cylinder 4 Misfire
A
Yes
P0317
Rough Road Sensor Source Not Detected
Cnl
No
P0325
Knock Sensor Internal Malfunction
Cnl
No
P0327
Knock Sensor Circuit Fault
Cnl
No
P0336
58X Crank Position Sensor Extra/Missing Pulses
E
Yes
P0337
58X Crank Position Sensor No Signal
A
Yes
P0341
Camshaft Position Sensor Rationality
E
Yes
P0342
Camshaft Position Sensor No Signal
A
Yes
P0351
Ignition Control Circuit A Fault (Cylinder 1 and 4)
A
Yes
P0352
Ignition Control Circuit B Fault (Cylinder 2 and 3)
A
Yes
P0401
Exhaust Gas Recirculation Insufficient Flow
Cnl
No
P0402
Exhaust Gas Recirculation Excessive Flow
E
Yes
P0404
Exhaust Gas Recirculation Open Valve Position Error
E
Yes
P0405
Exhaust Gas Recirculation Pintle Position Low Voltage
E
Yes
P0406
Exhaust Gas Recirculation Pintle Position High Voltage
E
Yes
P0420
Catalyst Oxygen Sensor Low Efficiency
A
Yes
P0443
Evaporative Emission System Purge Solenoid Control Circuit
E
Yes
P0461
Fuel Level Stuck
Cnl
No
P0462
Fuel Level Low Voltage
Cnl
No
P0463
Fuel Level High Voltage
Cnl
No
P0502
Vehicle Speed Sensor No Signal (Engine Side)
E
Yes
P0506
Idle Speed rpm Lower Than Desired Idle Speed
E
Yes
P0507
Idle Speed rpm Higher Than Desired Idle Speed
E
Yes
P0532
A/C Pressure Sensor Low Voltage
Cnl
No
P0533
A/C Pressure Sensor High Voltage
Cnl
No
P0562
System Voltage Too Low (Engine Side)
Cnl
No
P0563
System Voltage Too High (Engine Side)
Cnl
No
P0601
ECM Checksum Error (Engine Side)
A
Yes
P0607
Lower Power Counter Error
Cnl
No
P0700
Transaxle Control Module Malfunction
A
Yes
P1106
Manifold Absolute Pressure Intermittent High Voltage
Cnl
No
P1107
Manifold Absolute Pressure Intermittent Low Voltage
Cnl
No
P1111
Intake Air Temperature Intermittent High Voltage
Cnl
No
P1112
Intake Air Temperature Intermittent Low Voltage
Cnl
No
P1114
Engine Coolant Temperature Intermittent Low Voltage
Cnl
No
P1115
Engine Coolant Temperature Intermittent High Voltage
Cnl
No
P1121
Throttle Position Sensor Intermittent High Voltage
Cnl
No
P1122
Throttle Position Sensor Intermittent Low Voltage
Cnl
No
P1133
Front Heated Oxygen Sensor (HO2S1) Too Few Transitions
E
Yes
P1134
Front Heated Oxygen Sensor (HO2S1) Transition Ratio
E
Yes
P1167
Front Heated Oxygen Sensor (HO2S1) Rich in Decel Fuel Cut-off (DFCO)
A
Yes
P1171
Fuel Trim System Lean During Power Enrichment
B
Yes
P1336
58X Crank Position Tooth Error Not Learned
A
Yes
P1380
Rough Road Sensor Rough Road Data Invalid
Cnl
No
P1381
Rough Road Sensor Serial Data Fault
Cnl
No
P1391
G Sensor Rough Road Rationality
Cnl
No
P1392
G Sensor Rough Road Low Voltage
Cnl
No
P1393
G Sensor Rough Road High Voltage
Cnl
No
P1404
Exhaust Gas Recirculation Closed Valve Pintle Error
E
Yes
P1601
SPI Communications Between ECM and TCM
A
Yes
P1607
Lower Power Counter Reset
Cnl
No
P1626
Immobilizer No Response
Cnl
No
P1631
Immobilizer Incorrect Response
Cnl
No
P1650
SPI Communications Between Error with SIDM Chip
Cnl
No
P1655
SPI Communications Between Error with PSVI Chip
E
Yes

Diagnostic Trouble Code (DTC) P0106

Manifold Absolute Pressure Rationality

Circuit Description

The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor to control the fuel delivery and the ignition timing. The MAP sensor measures the changes in the intake manifold pressure which results from engine load (intake manifold vacuum) and the rpm changes, and it converts these into voltage outputs. The ECM can detect if the MAP sensor is not responding to the Throttle Position (TP) changes by comparing the actual MAP change to a predicted MAP change based on the amount of TP change that occurs. If the ECM does not see the expected MAP change or more, DTC P0106 will set.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

With the ignition ON and the engine stopped, the manifold pressure is equal to atmospheric pressure and the signal voltage will be high. This information is used by the ECM as an indication of vehicle altitude. Comparison of this reading with a known good vehicle with the same sensor is a good way to check the accuracy of a suspect sensor. Readings should be the same +0.4 volt.
The MAP sensor vacuum source should be thoroughly checked for restrictions at the intake manifold.

Test Description

Numbers below refer to the step numbers on the Diagnostic Table.
  1. 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 occurred. The information is then stored on the scan tool for later reference.
  2. A sensor that displays an ignition ON, engine OFF BARO value that does not appear normal for the altitude the vehicle is in should be considered to be malfunctioning.
  3. While starting the engine, the MAP sensor should detect any changes in the manifold pressure. This test is to determine if the sensor is stuck at a value.
  4. A normal MAP sensor will react as quickly to the throttle changes as they can be made. A sensor should not appear to be lazy or catch up with the throttle movements.
  5. This step checks if the reason for no MAP change was due to a faulty sensor or vacuum source to the sensor.
  6. The MAP sensor vacuum source should be thoroughly checked for restrictions. A drill bit can be used to clean out any casting flash that may exist in the vacuum port.
  7. The MAP sensor vacuum source should be thoroughly checked for restrictions. A drill bit can be used to clean out any casting flash that may exist in the vacuum port.
  8. The MAP Sensor System Performance diagnostic may have to complete several tests before determining if the diagnostic has passed or failed the last test. Operate the vehicle in the Conditions for Setting the DTC several times to ensure that the diagnostic runs enough tests to pass or fail.
  9. If no faults have been found at this point and no additional DTCs were set, refer to "Diagnostic Aids"in this section for additional checks and information.

DTC P0106 - Manifold Absolute Pressure Rationality

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition switch to ON, with the engine not running.
  3. Compare the Barometric Pressure (BARO) reading with a known good vehicle.
Is the BARO reading similar?
-
Go to Step 3
Go to Step 8
3
Start the engine while watching the Manifold Absolute Pressure (MAP) sensor value.
Does the MAP sensor value change while starting the engine?
-
Go to Step 4
Go to Step 5
4
With the engine still running, snap the throttle while watching the MAP sensor display on the scan tool.
Does the MAP sensor value change rapidly with the throttle position changes?
-
Go to Step 9
Go to Step 6
5
  1. Turn the ignition switch OFF.
  2. Remove the MAP sensor and install a vacuum pump to the MAP sensor.
  3. Turn the ignition switch ON, with the engine OFF.
  4. Apply 380 mm Hg (15 in Hg) to the MAP sensor.
Does the MAP sensor value on the scan tool change?
-
Go to Step 7
Go to Step 8
6
  1. Remove the MAP sensor from the manifold port.
  2. Inspect the port and MAP sensor for restrictions and repair as necessary.
Is the repair complete?
-
Go to Step 9
Go to Step 8
7
Repair the restriction in the MAP sensor or vacuum port as necessary.
Is the action complete?
-
Go to Step 9
-
8
Replace the MAP sensor.
Is the action complete?
-
Go to Step 9
-
9
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 10
Go to Step 2
10
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to
applicable DTC table
System OK

T5B11F12
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0107

Manifold Absolute Pressure Low Voltage

Circuit Description

The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor to control the fuel delivery and the ignition timing. The MAP sensor measures the changes in the intake manifold pressure which results from engine load (intake manifold vacuum) and the rpm changes, and it converts these into voltage outputs. The ECM sends a 5 volt reference voltage to the MAP sensor. As the manifold pressure changes, the output of MAP sensor also changes. By monitoring the Map sensor output voltage, the ECM knows the manifold pressure. A low pressure (low voltage) output voltage will be about 1.0 to 1.5 volts while the higher pressure (high voltage) output voltage will be about 4.5 to 4.8 volts at Wide Open Throttle(WOT). The MAP sensor is also used, under certain conditions to measure Barometric Pressure (BARO), allowing the ECM to make adjustments for different altitude.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

With the ignition ON and the engine stopped, the manifold pressure is equal to atmospheric pressure and the signal voltage will be high. This information is used by the ECM as an indication of vehicle altitude. Comparison of this reading with a known good vehicle with the same sensor is a good way to check the accuracy of a suspect sensor. Readings should be the same 12 kPa.
If a DTC P0107 is intermittent, refer to "Manifold Absolute Pressure Check" in this section for further diagnosis.

Important : After repairs, use the scan tool FUEL TRIM RESET function to reset long-term fuel trim to 128 (0%).

Test Description

Numbers below refer to the step numbers on the Diagnostic Table.
  1. 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.
  2. This step will determine if DTC P0107 is the result of a hard failure or an intermittent condition.
  3. Jumpering harness terminals B to C (signal circuit to 5 volts) will determine if the sensor is malfunctioning or if there is a problem with the ECM or wiring.
  4. The scan tool may not display 5 volts. The Important thing is that the ECM recognizes the voltage as more than 4 volts, indicating that the PCM and the signal circuit are OK. A test light that illuminates indicates a short to ground in the signal circuit.
  5. A short to ground in the 5 volt reference circuit could also set additional DTCs.
  6. The replacement ECM must be programmed. Refer to the latest Techline procedure for the ECM reprogramming.

DTC P0107 Manifold Absolute Pressure Low Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Start the engine.
  3. Read the Manifold Absolute Pressure (MAP).
Does the scan tool display a MAP below the specified value?
12 kPa
Go to Step 3
Go to Step 4
3
  1. Turn the ignition switch OFF.
  2. Disconnect the MAP sensor electrical connector.
  3. Jumper the MAP signal circuit at terminal B to the 5 volt reference circuit at terminal C.
  4. Turn the ignition switch ON.
Does the MAP read more than the specified value?
96 kPa
Go to Step 5
Go to Step 6
4
  1. Turn the ignition switch ON with the engine OFF, review the Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the freeze frame conditions and Conditions For Setting the DTC as noted.
Does the scan tool display MAP below the specified value?
12 kPa
Go to Step 3
Go to
"Diagnostic Aids"
5
Inspect the MAP sensor harness electrical connector terminals for the following conditions:
  • Poor connections.
  • Proper contact tension.
  • Poor terminal to wire connection.
Is a problem found?
-
Go to Step 8
Go to Step 9
6
  1. Turn the ignition switch OFF.
  2. Remove the jumper wire.
  3. Probe the MAP sensor signal circuit terminal B with a test light to B+.
  4. Turn the ignition switch ON.
Does the scan tool read over the specified value?
90 kPa
Go to Step 7
Go to Step 12
7
Check the MAP sensor 5 volt reference circuit at terminal C for an open or short to ground.
Is a problem found?
-
Go to Step 10
Go to Step 11
8
Repair the connection terminals as necessary.
Is the action complete?
-
Go to Step 14
-
9
Replace the MAP sensor.
Is the action complete?
-
Go to Step 14
-
10
Repair the MAP sensor 5 volt reference circuit.
Is the action complete?
-
Go to Step 14
-
11
  1. Turn the ignition OFF.
  2. Replace the Engine Control Module (ECM).
Is the action complete?
-
Go to Step 14
-
12
Check the MAP sensor signal circuit for the following conditions:
  • Open.
  • Short to ground.
  • Short to sensor ground.
Is a problem found?
-
Go to Step 13
Go to Step 11
13
Repair the MAP sensor signal circuit.
Is the action complete?
-
Go to Step 14
-
14
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 15
Go to Step 2
15
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to
applicable DTC table
System OK

T5B11F12
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0108

Manifold Absolute Pressure High Voltage

Circuit Description

The Engine Control Module (ECM) uses the Manifold Absolute Pressure (MAP) sensor to control the fuel delivery and the ignition timing. The MAP sensor measures the changes in the intake manifold pressure which results from engine load (intake manifold vacuum) and the rpm changes, and it converts these into voltage outputs. The ECM sends a 5 volt reference voltage to the MAP sensor. As the manifold pressure changes, the output of MAP sensor also changes. By monitoring the Map sensor output voltage, the ECM knows the manifold pressure. A low pressure (low voltage) output voltage will be about 1.0 to 1.5 volts while the higher pressure (high voltage) output voltage will be about 4.5 to 4.8 volts at Wide Open Throttle(WOT). The MAP sensor is also used, under certain conditions to measure Barometric Pressure (BARO), allowing the ECM to make adjustments for different altitude.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

With the ignition ON and the engine stopped, the manifold pressure is equal to atmospheric pressure and the signal voltage will be high. This information is used by the ECM as an indication of vehicle altitude. Comparison of this reading with a known good vehicle with the same sensor is a good way to check the accuracy of a suspect sensor. Readings should be the same 12 kPa.
If a DTC P0108 is intermittent, refer to "Manifold Absolute Pressure Check" in this section for further diagnosis.
DTC P0108 may set as result of a misfire. If misfire is present, repair the cause of misfire before using this table. The misfire counters may be used to determine which cylinder(s) is misfiring.

Note : After repairs, use the scan tool FUEL TRIM RESET function to reset long-term fuel trim to 128 (0%).
If DTC P0172 is also set, check 5 volt reference circuit for short to voltage.

Test Description

Numbers below refer to the step numbers on the Diagnostic Table.
  1. 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.
  2. This step will determine if DTC P0108 is the result of a hard failure or an intermittent condition.
  3. This step simulates conditions for a DTC P0107. If the ECM recognizes the change, the ECM, the 5 volt reference and the sensor signal circuits are OK.
  4. This step also looks for an open in the sensor ground circuit. If the circuit was open, additional DTCs will also be set. If no other DTCs are set and the circuit is found to be open, then the open must be between the MAP sensor and the electrical connector ground splice.
  5. When the sensor signal circuit is shorted to battery voltage, the TP will be displayed above 0% at all times and A/C High Side will be displayed high. The vehicle will also remain in Open Loop.
  6. The MAP sensor vacuum source should only supply vacuum to the MAP sensor. Check the vacuum port for a restriction caused by casting flash.
  7. Disconnect all sensors that use a 5 volt reference one at a time while monitoring the short on the 5 volt reference circuit. Replace any sensor that may have caused the short on the 5 volt reference circuit.
  8. The replacement ECM must be programmed to the latest Techline procedure for the ECM reprogramming.

DTC P0108 - Manifold Absolute Pressure High Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Start the engine.
  3. Read the Manifold Absolute Pressure (MAP).
Does the scan tool display a MAP of the specified value or over?
85 kPa
Go to Step 3
Go to Step 4
3
  1. Turn the ignition switch OFF.
  2. Disconnect the MAP sensor electrical connector.
  3. Turn the ignition switch ON.
Does the MAP read less than the specified value?
28 kPa
Go to Step 5
Go to Step 6
4
  1. Turn the ignition switch ON with the engine OFF, review the Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the freeze frame conditions and Conditions For Setting the DTC as noted.
Does the scan tool display MAP equal to or greter than the specified value?
85 kPa
Go to Step 3
Go to
"Diagnostic Aids"
5
Probe the MAP sensor signal ground circuit at terminal A with a test light connected to battery +.
Does the test light illuminate?
-
Go to Step 7
Go to Step 11
6
Check the MAP sensor signal circuit at terminal M8 of ECM for a short to voltage and repair as needed.
Is a repair necessary?
-
Go to Step 14
Go to Step 12
7
With a ohmmeter connected to the ground, probe the 5 volt reference circuit terminal M16.
Is the resistance within near the specified value.
5 v
Go to Step 8
Go to Step 9
8
Check the MAP sensor vacuum source for being plugged or leaking.
Is a problem found?
-
Go to Step 10
Go to Step 13
9
Check the 5 volt reference circuit at terminal M16 for a short to voltage and repair as needed.
Is the repair complete?
-
Go to Step 14
Go to Step 12
10
Repair the vacuum source as needed.
Is the action complete?
-
Go to Step 14
-
11
Check for an open in the MAP sensor ground circuit at terminal 1 and repair as needed.
Is the repair complete?
-
Go to Step 14
Go to Step 12
12
  1. Turn the ignition switch OFF.
  2. Replace the Engine Control Module (ECM).
Is the action complete?
-
Go to Step 14
-
13
Replace the MAP sensor.
Is the action complete?
-
Go to Step 14
-
14
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 15
Go to Step 2
15
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to
applicable DTC table
System OK

T3B11F41
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0112

Intake Air Temperature low Voltage

Circuit Description

The Intake Air Temperature (IAT) sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference and a ground to the sensor. When the air is cold, the resistance is high; therefore the IAT signal voltage will be high. If the intake air is warm, resistance is low; therefore the IAT signal voltage will be low.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

If the vehicle is at ambient temperature, compare the IAT sensor to the Engine Coolant Temperature (ECT) sensor. The IAT sensor and the ECT sensor should be relatively close to each other.
Use the Temperature vs. Resistance Values table to evaluate the possibility of a skewed sensor. Refer to "Temperature vs. Resistance" in this section.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. This step simulates a DTC P0113 condition. If the scan tool displays the specified value, the IAT signal circuit, the ECM are OK.
  3. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0112 - Intake Air Temperature Low Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.
Is the Intake Air Temperature (IAT) value greater than the specified value?
128°C
(262 °F)
Go to Step 4
Go to Step 3
3
  1. Turn the ignition switch ON with the engine OFF, review Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting The DTC as noted.
Is the IAT sensor value greater than the specified value?
128°C
(262 °F)
Go to Step 4
Go to
"Diagnostic Aids"
4
  1. Turn the ignition switch OFF.
  2. Disconnect the IAT sensor electrical connector.
  3. Turn the ignition switch ON.
Is the IAT sensor value below the specified value?
-30 °C
(-22 °F)
Go to Step 5
Go to Step 6
5
Replace IAT sensor.
Is the repair complete?
-
Go to Step 10
-
6
With a test light connected to battery +, probe the IAT sensor signal circuit, terminal 1 at the IAT sensor connector.
Does the test light illuminate?
-
Go to Step 7
Go to Step 9
7
  1. Turn the ignition switch OFF.
  2. Disconnect the Engine Control Module (ECM) connector.
  3. With a test light connected to B+, probe the IAT sensor signal circuit, terminal 1 at the IAT sensor electrical connector.
Does the test light illuminate?
-
Go to Step 8
Go to Step 9
8
Repair the short to ground circuit in the IAT sensor signal circuit as needed.
Is the repair complete?
-
Go to Step 10
-
9
  1. Turn the ignition OFF.
  2. Replace the ECM.
Is the action complete?
-
Go to Step 10
-
10
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run 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 the applicable DTC table
System OK

T3B11F41
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0113

Intake Air Temperature High Voltage

Circuit Description

The Intake Air Temperature (IAT) sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference and a ground to the sensor. When the air is cold, the resistance is high; therefore the IAT signal voltage will be high. If the intake air is warm, resistance is low; therefore the IAT signal voltage will be low.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. This step simulates a DTC P0112. If the ECM senses the change, the ECM and wiring are OK.
  3. This step will determine if the reason the ECM did not sense the change was due to a open ground or signal circuit or malfunctioning ECM.
  4. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0113 Intake Air Temperature High Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.
Is the Intake Air Temperature (IAT) value less than the specified value?
-30 °C
(-22 °F)
Go to Step 4
Go to Step 3
3
  1. Turn the ignition switch ON with the engine OFF, review Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting The DTC as noted.
Is the IAT sensor value less than the specified value?
-30 °C
(-22 °F)
Go to Step 4
Go to
"Diagnostic Aids"
4
  1. Turn the ignition switch OFF.
  2. Disconnect the IAT sensor electrical connector.
  3. Turn the ignition switch ON.
  4. Jumper the IAT sensor signal circuit terminal 2 and ground circuit terminal 1.
Is the IAT sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 6
Go to Step 5
5
Jumper the IAT sensor signal circuit at terminal 1 to ground.
Is the IAT sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 7
Go to Step 8
6
Check for a poor connection at the IAT sensor connector and repair or replace any malfunctioning terminal as needed.
Is the repair necessary?
-
Go to Step 12
Go to Step 10
7
Check the IAT sensor ground circuit for an open and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 9
8
Check the IAT sensor signal circuit for an open and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 9
9
Check for a poor IAT sensor ground circuit at terminal M64 or a poor IAT sensor signal circuit terminal M7 connection at Engine Control Module (ECM) and repair as needed.
Is the repair necessary?
-
Go to Step 12
Go to Step 11
10
Replace the IAT sensor.
Is the action complete?
-
Go to Step 12
-
11
  1. Turn the ignition OFF.
  2. Replace the ECM.
Is the action complete?
-
Go to Step 12
-
12
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 13
Go to Step 2
13
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to applicable DTC table
System OK

T3B11F42
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0117

Engine Coolant Temperature Low Voltage

Circuit Description

The Engine Coolant Temperature (ECT) sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference and a ground to the sensor. When the engine coolant is cold, the resistance is high; therefore the ECT signal voltage will be high. If the engine coolant is warm, sensor resistance becomes less; therefore the IAT signal voltage drops. At normal engine operating temperature, the voltage will be between 1.5 to 2.0 volts at the ECT signal terminal.
The ECT sensor is used to control following items:

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

After engine start the ECT should rise steadily to 90 °C (194 °F) then stabilize when the thermostat opens.
Use the Temperature vs. Resistance Values table to evaluate the possibility of a skewed sensor. Refer to "Temperature vs. Resistance" in this section.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. This step simulates a DTC P0118 condition. If the ECM senses the change, then the ECM and the ECT wiring are OK.
  3. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0117 - Engine Coolant Temperature Low Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.
Is the Engine Coolant Temperature (ECT) sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 4
Go to Step 3
3
  1. Turn the ignition switch ON with the engine OFF, review Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting The DTC as noted.
Is the ECT sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 4
Go to
"Diagnostic Aids"
4
  1. Turn the ignition switch OFF.
  2. Disconnect the ECT sensor connector.
  3. Turn the ignition switch ON.
Is the ECT sensor value below the specified value?
-30 °C
(-22 °F)
Go to Step 6
Go to Step 5
5
Check the ECT sensor signal circuit at terminal 1 for a short to ground and repair as needed.
Is the repair complete?
-
Go to Step 8
Go to Step 7
6
Replace ECT sensor.
Is the repair complete?
-
Go to Step 8
-
7
  1. Turn the ignition OFF.
  2. Replace the Engine Control Module (ECM).
Is the action complete?
-
Go to Step 8
-
8
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 9
Go to Step 2
9
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to applicable DTC table
System OK

T3B11F42
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0118

Engine Coolant Temperature High Voltage

Circuit Description

The Engine Coolant Temperature (ECT) sensor uses a thermistor to control the signal voltage to the Engine Control Module (ECM). The ECM supplies a 5 volt reference and a ground to the sensor. When the engine coolant is cold, the resistance is high; therefore the ECT signal voltage will be high. If the engine coolant is warm, sensor resistance becomes less; therefore the IAT signal voltage drops. At normal engine operating temperature, the voltage will be between 1.5 to 2.0 volts at the ECT signal terminal.
The ECT sensor is used to control following items:

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

Normal operating temperature for the engine cooling system is between 90 °C(194 °F) and 95°C(203°F).
Use the Temperature vs. Resistance Values table to evaluate the possibility of a skewed sensor. Refer to "Temperature vs. Resistance" in this section.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. This step simulates a DTC P0117 condition. If the ECM senses the change, then the ECM and the ECT wiring are OK.
  3. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0118 - Engine Coolant Temperature High Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.
Is the engine Coolant Temperature (ECT) value less than the specified value?
-30 °C
(-22 °F)
Go to Step 4
Go to Step 3
3
  1. Turn the ignition switch ON with the engine OFF, review Freeze Frame data, and note the parameters.
  2. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting The DTC as noted.
Is the ECT sensor value less than the specified value?
-30 °C
(-22 °F)
Go to Step 4
Go to
"Diagnostic Aids"
4
  1. Turn the ignition switch OFF.
  2. Disconnect the ECT sensor connector.
  3. Turn the ignition switch ON.
  4. Jumper the ECT sensor signal circuit terminal 1 and ground circuit terminal 2.
Is the ECT sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 6
Go to Step 5
5
Jumper the ECT sensor signal circuit at terminal 1 to ground.
Is the ECT sensor value greater than the specified value?
130 °C
(266 °F)
Go to Step 7
Go to Step 8
6
Check for a poor connection at the ECT sensor connector and repair or replace any malfunctioning terminal as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 10
7
Check the ECT sensor ground circuit for an open and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 9
8
Check the ECT sensor signal circuit for an open and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 9
9
Check for a poor ECT sensor ground circuit at terminal M64 or a poor ECT sensor signal circuit terminal M28 connection at Engine Control Module (ECM) and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 11
10
Replace the ECT sensor.
Is the repair complete?
-
Go to Step 12
-
11
  1. Turn the ignition OFF.
  2. Replace the ECM.
Is the action complete?
-
Go to Step 12
-
12
  1. Using the scan tool, clear the Diagnostic Trouble Codes(DTVCs.)
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scantool indicate that this diagnostic has run and passed?
-
Go to Step 13
Go to Step 2
13
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
 -
Go to applicable DTC table
System OK

T5B11F17
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0122

Throttle Position Sensor Low Voltage

Circuit Description

The Engine Control Module (ECM) supplies a 5 volt reference voltage signal and a ground to the Throttle Position (TP) sensor. The TP sensor sends a voltage signal back to the ECM relative to the throttle plate opening. The voltage signal will vary from approximately 0.33 volts at closed throttle, to over 4.3 volts at Wide Open Throttle (WOT).
The TP signal is used by the ECM for fuel control and for most of the ECM controlled outputs. The TP signal is one of the most important inputs used by the ECM for fuel control and most of the ECM controlled outputs.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

If the DTC P0122 cannot be duplicated, the information included in the Freeze Frame data can be useful. Use a scan tool information data to determine the status of the DTC. If the dc occurs intermittently, using the Diagnostic table may help isolate the problem.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. The TP sensor has an auto zeroing feature. If the voltage reading is between 0.2 to 0.9 volts, the ECM will assume the TP sensor is at a closed throttle position (0%).
  3. Simulates a high voltage signal which will identify an open in the signal circuit.
  4. If additional DTCs are set, check the 5v reference circuits for a short to ground.
  5. If the test light illuminates while probing the TP signal circuit, then the TP signal circuit is shorted to ground.
  6. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.
  7. If no faults have been found at this point and no additional DTCs were set, refer to "Diagnostic Aids"for additional checks and information.

DTC P0122 - Throttle Position Sensor Low Voltage

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
  1. Install a scan tool to the Data Link Connector DLC).
  2. Turn the ignition ON.
Is the Throttle Position (TP) sensor voltage below the specified value?
0.20 V
Go to Step 4
Go to Step 3
3
  1. Turn the ignition ON.
  2. Review the Freeze Frame data and note the parameters.
  3. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC as noted.
Is the TP sensor voltage below the specified value?
0.20 V
Go to Step 4
Go to Step 12
4
  1. Turn the ignition OFF.
  2. Disconnect the TP sensor connector.
  3. Turn the ignition ON.
  4. Jump the 5 volt reference circuit terminal 2 and the TP signal circuit terminal 3 at the TP sensor connector.
Is the TP sensor voltage over the specified value?
4.0 V
Go to Step 10
Go to Step 5
5
Connect a test light between B+ and the TP sensor signal circuit terminal 3.
Is the TP sensor voltage greater than the specified value?
4.0 V
Go to Step 6
Go to Step 8
6
Check the TP sensor 5 volt reference circuit for an open or short to ground and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 7
7
Check the 5 volt reference circuit for a poor connection at terminal M32 of the Engine Control Module (ECM) and repair as needed.
Is a repair necessary?
-
Go to Step 12
Go to Step 11
8
Check the TP sensor signal circuit between terminal C of the TP sensor and terminal M6 of the ECM for an open or a short to ground and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 9
9
Check the TP sensor signal circuit, terminal M6 of the ECM for a poor connection and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 11
10
Replace the TP sensor.
Is the action complete?
-
Go to Step 12
-
11
  1. Turn the ignition OFF.
  2. Replace the ECM.
Is the action complete?
-
Go to Step 12
-
12
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 13
Go to Step 2
13
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to applicable DTC table
System OK

T5B11F17
Display graphicTranslations of text in graphics


Diagnostic Trouble Code (DTC) P0123

Throttle Position Sensor High Voltage

Circuit Description

The Engine Control Module (ECM) supplies a 5 volt reference voltage signal and a ground to the Throttle Position (TP) sensor. The TP sensor sends a voltage signal back to the ECM relative to the throttle plate opening. The voltage signal will vary from approximately 0.33 volts at closed throttle, to over 4.3 volts at Wide Open Throttle (WOT).
The TP signal is used by the ECM for fuel control and for most of the ECM controlled outputs. The TP signal is one of the most important inputs used by the ECM for fuel control and most of the ECM controlled outputs.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

If the DTC P0123 cannot be duplicated, the information included in the Freeze Frame data can be useful. Use a scan tool information data to determine the status of the DTC. If the dc occurs intermittently, using the Diagnostic table may help isolate the problem.
With ignition ON and the throttle at closed position, the voltage should read between 0.2 and 0.90 volts and increase steadily to over 4.3 volts at WOT.
DTCs P0123 and P0113 stored at the same time could be result of an open sensor ground circuit.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.
  1. 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.
  2. With the throttle closed, the TP sensor voltage should read less than 0.90 volts. If the TP sensor voltage does not read less than 0.90 volts check for a binding or sticking throttle cable.
  3. With the TP sensor disconnected, the TP sensor voltage should be less than 0.2 volts if the ECM and wiring are OK.
  4. Probing the ground circuit with a test light checks the circuit for high resistance which will cause a DTC P0123 to set.
  5. A shorted 5 volt reference circuit will also set additional DTCs.
  6. The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.

DTC P0123 - Throttle Position Sensor High Voltage

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
  1. Install a scan tool to the Data Link Connector (DLC).
  2. Turn the ignition ON.
Is the Throttle Position (TP) sensor voltage greater than the specified value?
1.0 V
Go to Step 4
Go to Step 3
3
  1. Turn the ignition ON.
  2. Review the Freeze Frame data and note the parameters.
  3. Operate the vehicle within the Freeze Frame conditions and Conditions for Setting the DTC as noted.
Is the TP sensor voltage greater than the specified value?
3.9 V
Go to Step 4
Go to Step 12
4
  1. Turn the ignition OFF.
  2. Disconnect the TP sensor connector.
  3. Turn the ignition ON.
Is the TP sensor voltage less than the specified value?
0.2 V
Go to Step 5
Go to Step 6
5
Probe the TP sensor ground circuit, terminal 1 at the TP sensor connector with a test light connected to B+.
Does the test light illuminate?
-
Go to Step 7
Go to Step 9
6
Check the TP sensor signal circuit for an short to voltage and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 11
7
Check the 5 volt reference circuit for a short to B+ and repair as needed.
Is the repair complete?
-
Go to Step 12
Go to Step 8
8
Check the TP sensor electric connector for a poor connection and repair as needed.
Is a repair necessary?
-
Go to Step 12
Go to Step 10
9
Check the TP sensor ground circuit for an open and repair as needed.
Is the repair necessary?
-
Go to Step 12
Go to Step 11
10
Replace the TP sensor.
Is the action complete?
-
Go to Step 12
-
11
  1. Turn the ignition OFF.
  2. Replace the Engine Control Module (ECM).
Is the action complete?
-
Go to Step 12
-
12
  1. Using the scan tool, clear the Diagnostic Trouble Codes (DTCs).
  2. Start the engine and idle at normal operating temperature.
  3. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text.
Does the scan tool indicate that this diagnostic has run and passed?
-
Go to Step 13
Go to Step 2
13
Check if any additional DTCs are set.
Are any DTCs displayed that have not been diagnosed?
-
Go to applicable DTC table
System OK


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