SECTION 9U
CRUISE CONTROL SYSTEM
Caution : Disconnect the negative battery cable before removing or installing any electrical unit or when a tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless otherwise noted.
SPECIFICATIONS
Fastener Tightening Specifications
Application
|
N•m
|
Lb-Ft
|
Lb-In
|
|
Cruise Control Actuator Mounting Bolts
|
6
|
-
|
53
|
|
Hood Release Handle Screw
|
2.5
|
-
|
22
|
SCHEMATIC AND ROUTING DIAGRAM
Cruise Control System
DIAGNOSIS
Cruise Control Diagnosis
Test Description
The number(s) below refer to step(s) on the diagnostic table.
- The electromagnetic clutch in the cruise control actuator is grounded through the brake lamps.
Cruise Control Does Not Operate
| Step |
Action |
Value(s) |
Yes |
No |
| 1 |
Visually inspect the cruise control system and verify the following conditions:
- The electrical connector is correctly attached to the cruise control actuator.
- The actuator and the bracket are not loose.
- The cable is not bent or kinked.
- The cable adjuster is correctly attached to its bracket.
- The cable and bushing are correctly attached to the accelerator assembly.
- The cable is properly adjusted.
Have all of the above conditions been verified?
|
-
|
Go to Step 3
|
Go to Step 2
|
| 2 |
Make repairs to the components of the cruise control system that were faulty in Step 1.
Is the repair complete?
|
-
|
System OK
|
-
|
| 3 |
- Connect a scan tool to the data link connector (DLC).
- Check for engine control diagnostic trouble codes (DTCs).
Is a vehicle speed sensor (VSS) DTC 720, DTC 721, or DTC 722 present?
|
-
|
Go to Step 5
|
Go to Step 4
|
| 4 |
Diagnose the VSS DTC or automatic transaxle DTCs.
After the VSS has been repaired, is the cruise control still inoperative?
|
-
|
Go to Step 5
|
System OK
|
| 5 |
Observe the brake lamps when the brakes are being applied.
Do the brake lamps turn ON when the brakes are applied and turn OFF when the brakes are not applied?
|
-
|
Go to Step 7
|
Go to Step 6
|
| 6 |
Repair the brake lamp system.
Does the cruise control operate after the brake lamp system has been repaired?
|
-
|
System OK
|
Go to Step 7
|
| 7 |
Check fuses F4 and F19.
Is either fuse blown?
|
-
|
Go to Step 8
|
Go to Step 9
|
| 8 |
- Check for a short circuit and repair it, if necessary.
- Replace the blown fuse(s).
Is the repair complete?
|
-
|
System OK
|
-
|
| 9 |
- Turn the ignition ON.
- Check the voltage at fuses F4 and F19.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 11
|
Go to Step 10
|
| 10 |
Repair the power supply to the fuse(s).
Is the repair complete?
|
-
|
System OK
|
-
|
| 11 |
- Disconnect the electrical connector from the cruise control actuator.
- Turn the ignition ON.
- Check the voltage at terminal 3 of the cruise control actuator connector.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 13
|
Go to Step 12
|
| 12 |
Repair the open circuit between fuse F4 and cruise control actuator connector terminal 3.
Is the repair complete?
|
-
|
System OK
|
-
|
| 13 |
With the electrical connector still removed from the cruise control actuator, use an ohmmeter to measure the resistance between cruise control actuator connector terminal 6 and ground.
Is the resistance equal to the specified value?
|
≈ 0 Ω
|
Go to Step 15
|
Go to Step 14
|
| 14 |
Repair the open circuit between ground and terminal 6 of the cruise control actuator connector.
Is the repair complete?
|
-
|
System OK
|
-
|
| 15 |
With the electrical connector still removed from the cruise control actuator, use an ohmmeter to measure the resistance between connector terminal 8 and the brake switch terminal 4.
Is the resistance equal to the specified value?
|
≈ 0 Ω
|
Go to Step 17
|
Go to Step 16
|
| 16 |
Repair the open circuit between the cruise control actuator connector terminal 8 and the brake switch terminal 4.
Is the repair complete?
|
-
|
System OK
|
-
|
| 17 |
- Turn the ignition ON.
- With the electrical connector still removed from the cruise control actuator, use a voltmeter to check the voltage at terminal 8 of the cruise control actuator connector when the brakes are being applied.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 19
|
Go to Step 18
|
| 18 |
Repair the open circuit between fuse Ef19 and terminal 8 of the cruise control actuator connector.
Is the repair complete?
|
-
|
System OK
|
-
|
| 19 |
- Turn the ignition ON.
- Turn the cruise control switch OFF.
- With the electrical connector still removed from the cruise control actuator, use a voltmeter to check the voltage at terminal 9 of the connector.
Is the voltage equal to the specified value?
|
≈ 0 Ω
|
Go to Step 21
|
Go to Step 20
|
| 20 |
Repair the short to voltage between the cruise control main switch and the cruise control actuator connector terminal 9.
Is the repair complete?
|
-
|
System OK
|
-
|
| 21 |
- Turn the ignition ON.
- Turn the cruise control switch ON.
- With the electrical connector still removed from the cruise control actuator, use a voltmeter to check the voltage at terminal 9 of the connector.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 23
|
Go to Step 22
|
| 22 |
Repair the open circuit between fuse Ef20 and the cruise control actuator terminal 9.
Is the repair complete?
|
-
|
System OK
|
-
|
| 23 |
- Turn the ignition ON.
- Turn the cruise control switch ON.
- With the electrical connector still removed from the cruise control actuator, check the voltage at terminals 7 and 2 of the connector.
Is the voltage equal to the specified value?
|
≈ 0 Ω
|
Go to Step 26
|
Go to Step 24
|
| 24 |
Replace the cruise control switch.
Is the repair complete?
|
-
|
System OK
|
-
|
| 25 |
Repair the short to voltage between the cruise control switch and the cruise control actuator connector.
Is the repair complete?
|
-
|
System OK
|
-
|
| 26 |
- Turn the ignition ON.
- Turn the cruise control switch ON.
- Select SET on the cruise control switch.
- While holding the switch in the SET position, check the voltage at terminal 2 of the cruise control actuator connector.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 27
|
Go to Step 31
|
| 27 |
- Turn the ignition ON.
- Turn the cruise control switch ON.
- Select RESUME on the cruise control switch.
- While holding the switch in the RESUME position, check the voltage at terminal 7 of the cruise control actuator connector.
Is the voltage equal to the specified value?
|
11-14 v
|
Go to Step 28
|
Go to Step 31
|
| 28 |
- Turn the ignition OFF.
- Disconnect the VSS.
- Use an ohmmeter to check the continuity between the DK GRN/WHT wire at the VSS and terminal 10 of the cruise control actuator connector.
Is the continuity equal to the specified value?
|
≈ 0 Ω
|
Go to Step 30
|
Go to Step 29
|
| 29 |
Repair the open circuit between the VSS and the cruise control actuator connector terminal 10.
Is the repair complete?
|
-
|
System OK
|
-
|
| 30 |
Replace the cruise control actuator connector.
Is the repair complete?
|
-
|
System OK
|
-
|
| 31 |
Replace the cruise control switch.
Is the repair complete?
|
-
|
System OK
|
-
|
MAINTENANCE AND REPAIR
ON-VEHICLE SERVICE
Cruise Control Actuator
Removal Procedure
- Remove the coin storage and the screws.
- Separate the hood release cable from the hood latch release handle.
- Carefully remove the instrument panel under cover by pulling until the retaining clips are free from the slots in the instrument panel.
- Remove the knee bolster. Refer to Section 9G, Interior Trim.
- Disconnect the electrical connector from the cruise control actuator.
- Remove the cruise control actuator mounting bolts.
- Press the release button on the cable adjuster and push the cable toward the adjuster until the spring is compressed.
Notice : When the adjuster button is pressed, do not allow the adjuster spring to expand to a length of more than 2 cm (3/4 inch) or the adjuster rack will come out of the adjuster, and it will have to be reinserted. To keep the adjuster in one piece during adjustment, hold the cable when the adjuster button is pressed.
- Tilt the cable housing and insert a flat-blade screwdriver into one of the slots in the actuator.
- Tilt the cable housing toward the screwdriver. The cable housing retainers will release.
- Pull the guide sleeve and the cable out of the actuator and turn the cable 90 degrees to the axis of the guide sleeve.
- Remove the actuator from the cable.
Installation Procedure
- Insert the cable ball into the actuator cable sleeve.
- Push the cable housing and the sleeve into the actuator until the retainers lock the cable housing in place.
- Install the cruise control actuator mounting bolts.
Tighten
Tighten the cruise control actuator mounting bolts to 6 N•m (53 lb-in).
- Press the cable adjuster button and adjust the cable so that the cable ball nipple is 0.5 mm (0.02 inch) from the bushing on the accelerator assembly.
Notice : When the adjuster button is pressed, do not allow the adjuster spring to expand to a length of more than 2 cm (3/4 inch) or the adjuster rack will come out of the adjuster, and it will have to be reinserted. To keep the adjuster in one piece during adjustment, hold the cable when the adjuster button is pressed.
- Connect the electrical connector to the cruise control actuator.
- Install the knee bolster. Refer to Section 9G, Interior Trim.
- Align the instrument panel under cover and press the retaining clips into the slots in the instrument panel.
- Install the hood release handle screw.
Tighten
Tighten the hood release handle screw to 2.5 N•m (22 lb-in).
- Install the coin storage with the screw.
Actuator Control Cable
Removal Procedure
- Remove the coin storage and the screws.
- Separate the hood release cable from the hood latch release handle.
- Carefully remove the knee bolster trim panel by pulling until the retaining clips are free from the slots in the instrument panel.
- Remove the knee bolster. Refer to Section 9G, Interior Trim.
- Press the release button on the cable adjuster and push the cable toward the adjuster until the spring is compressed.
Notice : When the adjuster button is pressed, do not allow the adjuster spring to expand to a length of more than 2 cm (3/4 inch) or the adjuster rack will come out of the adjuster, and it will have to be reinserted. To keep the adjuster in one piece during adjustment, hold the cable when the adjuster button is pressed.
- Remove the cable bushing from the accelerator assembly.
- Press the retaining tabs of the cable adjuster and remove the adjuster from the mounting bracket.
- Tilt the cable housing and insert a flat-blade screwdriver into one of the slots in the actuator.
- Tilt the cable housing toward the screwdriver. The cable housing retainers will release.
- Pull the guide sleeve and the cable out of the actuator and turn the cable 90 degrees to the axis of the guide sleeve.
- Remove the actuator from the cable.
Installation Procedure
- Insert the ball of the cable assembly into the slot in the actuator rod and then rotate the cable 90 degrees.
- Push the guide sleeve onto the actuator rod and press the cable housing onto the actuator until it is locked in place by the retainers.
- Clip the cable adjuster into the bracket of the pedal mount assembly.
- Press the cable release button and slide the cable into the adjuster until the spring is fully compressed.
Notice : When the adjuster button is pressed, do not allow the adjuster spring to expand to a length of more than 2 cm (3/4 inch) or the adjuster rack will come out of the adjuster, and it will have to be reinserted. To keep the adjuster in one piece during adjustment, hold the cable when the adjuster button is pressed.
- Install the cable bushing into the pedal assembly.
- Press the cable release button and adjust the cable to achieve a gap of 0.5 mm (0.2 inch) between the bushing and the nipple of the ball.
- Install the knee bolster. Refer to Section 9G, Interior Trim.
- Align the instrument panel under cover and press the retaining clips into the slots in the instrument panel.
- Install the hood release handle screw.
Tighten
Tighten the hood release handle screw to 2.5 N•m (22 lb-in).
- Install the coin storage with the screw.
Cruise Control Switch
GENERAL DESCRIPTION AND SYSTEM OPERATION
Cruise Control System Operation
The purpose of the cruise control system is to automatically maintain a vehicle speed set by the driver. When the cruise control is activated, speed is maintained or increased by means of an electronically controlled cable attached to the accelerator assembly. If the vehicle must be slowed to maintain the speed that was set by the driver, the cruise control system allows the throttle return spring to close the throttle.
If driving conditions require sudden acceleration after the cruise control has been set, speed can be increased in the normal manner by manually pressing the accelerator. The cruise control is disengaged if the brakes (or clutch, with manual transaxle) are applied.
The minimum speed for setting the cruise control is 38.6 km/h (24 mph). When cruise control is operating, the CRUISE indicator lamp is on in the instrument cluster.
The cruise control system is capable of monitoring internal software and hardware faults as well as external faults in the connectors and wire harness. If a fault is detected, cruise control is stopped immediately, and the program logic and hardware logic independently prevent the cruise control from opening the throttle.
The cruise control will function in temperatures ranging from -40°C (-40°F) to 85°C (185°F). Maximum tem-perature could cause the regulation properties to be out of tolerance, but the safety shutdown will still be operational under maximum temperature conditions. If high temperature interferes with cruise control operation, the actuator electromagnetic clutch will open, and the throttle return spring will close the throttle, unless the accelerator pedal is pressed.
Cruise Control Actuator
The cruise control actuator is a single component system. The electronic controls are combined in one housing with the mechanical components. The actuator is mounted in the passenger compartment.
The mechanical components of the cruise control actuator are listed below:
- Permanent field DC motor.
- Single stage belt transfer gearing.
- Spindle drive.
- Electromagnetic clutch.
- Clutch plate with cable attachment.
- End switches.
- Plastic housing with noise reduction cover.
- Damping unit for clutch plate slap.
The mechanical parts are not serviceable. The entire actuator must be replaced if it is mechanically defective.
The electronics of the cruise control system include the following items:
- A microprocessor which controls speed regulation and monitors input signals.
- A clutch activation circuit which energizes the clutch magnet to couple the DC motor to the control cable.
- A driver circuit which activates the DC motor in a clockwise or counterclockwise direction.
- A control unit for lamp activation.
The electronic parts are not serviceable. The entire actuator must be replaced if there is an electronic defect in one of the systems.
Cruise Control Switch
After the main switch is turned on and the neutral position of the lever switch is detected by the cruise control actuator, the following operations can be performed by using the cruise control lever switch:
Set
If the cruise control is on and the minimum speed is 38.6 km/h (24 mph), but not more than 155 km/h (96 mph), the target speed can be set by selecting the SET button for 10 to 300 milliseconds. If SET is selected for more than 300 milliseconds, the cruise control will be activated in the COAST function. If the accelerator is pressed by the driver after the cruise control has been set, the previous target speed will be maintained when the accelerator is released. If the accelerator is pressed by the driver until the actual speed is more than 35 km/h (22 mph) over the target speed, or until the vehicle exceeds 160 km/h (99 mph), the cruise control will dis-engage.
Coast
If a target speed has been set and COAST is selected for at least 300 milliseconds, the throttle will return to idle, and the vehicle will coast. When the COAST switch is released, the current speed will be maintained as the new target speed. If the vehicle speed drops below 32.2 km/h (20 mph) while coasting, the cruise control will be disengaged. If the switch is released between +32.2 km/h (20 mph) and 38.6 km/h (24 mph), the minimum target speed of 38.6 km/h (24 mph) will be used.
Resume
If the cruise control is on, and the system was dis-engaged by using the brake or clutch, exceeding the maximum speed, failing to maintain the minimum speed, or exceeding the target speed by more than 35 km/h (22 mph), the last memorized speed can be reset by selecting RESUME if the time since disengagement is not greater than 5 seconds. The RESUME function is selected by switching to RESUME for 10 to 300 milli-seconds. If the actual speed is below the target speed when RESUME is selected, the vehicle will accelerate at 3.4 km/h per second (2.1 mph/second) until the vehicle is within 10 km/h (6 mph) of the target speed, and then acceleration will be reduced to achieve a smooth transition from acceleration to cruising. If the actual speed is above the target speed when RESUME is selected, the throttle will be allowed to return to idle until the target speed is achieved. RESUME can be canceled by selecting SET, and then the current speed will be maintained as the new target speed.
Accelerate
If cruise control is on, and the ACCEL switch is selected for more than 300 milliseconds, the vehicle will accelerate. The acceleration is maintained at the rate of 3.4 km/h per second (2.1 mph/second) as long as vehicle performance is sufficient; otherwise, full throttle is applied. When the switch is released, the current speed will be stored and used as the new target speed. The ACCEL switch cannot be used for acceleration above 155 km/h (96 mph). If 155 km/h (96 mph) is attained, acceleration will stop and 155 km/h will be set as the new target speed.
Tap-Up
If the cruise control has been set, and RESUME is selected again for more than 10 milliseconds, but less than 300 milliseconds, the target speed will increase by 2 km/h (1.2 mph) for each time that the RESUME button was selected (or tapped). If the driver has used the accelerator to increase speed over 8 km/h over the current target speed, a tap-up signal will be interpreted as a normal SET signal. The cruise control will not accept a tap-up target speed above 155 km/h (96 mph). If the actual speed has fallen 16.1 km/h (10 mph) below the target speed, tap-up signals are not accepted.
Tap-Down
If the cruise control is already set and SET is selected for between 10 and 300 milliseconds, the target speed will decrease by 2 km/h for each time that SET was selected (or tapped). Tap-down signals will not be accepted for a target speed below 38.6 km/h (24 mph). If the vehicle speed has increased to 8 km/h (5 mph) over the target speed, the cruise control system will interpret a tap-down signal as a SET.
If the cruise control is turned off with the main switch, all cruise control functions are stopped, the actuator cable is driven toward idle, and the electromagnetic clutch for the cable actuator is opened. The cable actuator clutch is not opened immediately to accomplish a smooth transition in vehicle speed. If the cruise control is off for more than 5 seconds, the memorized target speed is erased.
