PROCEDURE
Note. This is specified to H4DOTC engine (model).
START DIAGNOSIS.
Perform the pre-inspection.
Check the cruise control switch operation.
Is the cruise control switch turned ON?
YES
NO
Go to phenomenon 1. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
PERFORM CRUISE CANCEL CONDITIONS DIAGNOSIS .
Perform the cruise cancel conditions diagnosis.
Are any DTC indicated?
YES
Go to " LIST OF DTC ".
NO
CHECK CRUISE CONTROL SET OPERATION.
Check the cruise control set operation.
Can the cruise control be set while driving at 40 km/h (25 MPH)?
YES
NO
Go to phenomenon 2. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK VEHICLE SPEED IS HELD WITHIN SET SPEED.
Make sure the vehicle speed is held within set speed.
Is the vehicle speed held within set speed +/-3 km/h (+/-2 MPH)?
YES
NO
Go to phenomenon 3. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK RES/ACC OPERATION.
Check the RES/ACC operation.
Does the vehicle speed increase or return to set speed after RES/ACC switch has been pressed?
YES
NO
Go to phenomenon 4. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK SET/COAST OPERATION.
Check the SET/COAST operation.
Does the vehicle speed decrease after SET/COAST switch has been pressed?
YES
NO
Go to phenomenon 5. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK CANCEL OPERATION.
Check the CANCEL operation.
Is the cruise control released after CANCEL switch has been pressed?
YES
NO
Go to phenomenon 6. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK CRUISE CONTROL RELEASE OPERATION.
Check the cruise control release operation.
Is the cruise control released after brake pedal has been depressed?
YES
NO
Go to phenomenon 7. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
CHECK CRUISE CONTROL RELEASE OPERATION.
Check the cruise control release operation.
Is the cruise control released after clutch pedal has been depressed? (MT model)
YES
Finish the diagnostics.
NO
Go to phenomenon 8. See DIAGNOSTIC PROCEDURE WITH PHENOMENON .
Battery
Measure the battery voltage and specific gravity of electrolyte.
Standard voltage
12 V, or more
Specific gravity
Above 1.260
Scheme 45
- Cruise control cable
Check the cruise control cable installation.
If NG, install the cable securely.
Scheme 46
- Accelerator cable
Check the movement of accelerator cable when the cruise control throttle is moved by hand.
If NG, check the throttle cam.
Throttle Cam
Check that the throttle cam moves smoothly.
If NG, repair the throttle cam.
Scheme 47
Check that the throttle cam-to-lever clearance (A) or cable (B) inner cable deflection amount (D) is within specifications.
Throttle cam-to-lever clearance
0 - 1 mm (0 - 0.04 in)
Inner cable deflection
1 - 8 mm (0.04 - 0.31 in)
If NG, adjust the clearance with adjusting nut.
Note. Check that the cap (C) is positioned in the groove.
GENERAL TOOL
| TOOL NAME | REMARKS |
|---|---|
| Circuit tester | Used for measuring resistance, voltage and ampere. |
GENERAL TOOL DESCRIPTION
SUPPLEMENTAL RESTRAINT SYSTEM "AIRBAG"
Airbag system wiring harness is routed near the cruise control module and cruise control switch.
| IMPORTANT | All airbag system wiring harness and connectors are colored yellow. Do not use electrical test equipment on these circuits. Be careful not to damage the airbag system wiring harness when servicing the cruise control module and cruise control switch. |
Scheme 48
- Actuator
- Inhibitor switch (AT model)
- Cruise control module
- Cruise control command switch (main switch built - in)
- Cruise indicator light and cruise set indicator light
- Stop light and brake switch
- Clutch switch (MT model)
- Neutral position switch (MT model)
Scheme 49
| Content | Terminal No. | Measuring condition and I/O signal (ignition switch ON and engine idling) |
|---|---|---|
| Cruise indicator light | 1 | Battery voltage is present when main switch is turned OFF. "0 V" voltage is present when main switch is turned ON. |
| Cruise set indicator light | 3 | "0 V" voltage is present when cruise control is set and operated. Battery voltage is present when cruise control is not set and not operated. |
| Inhibitor switch (AT model) | 4 | Battery voltage is present when selector lever is other than "P" or "N" position. "0 V" voltage is present when selector lever is set to "P" or "N" position. |
| Motor B | 5 | ON-and-OFF ("0 V"-and-battery voltage) operation is alternately repeated while cruise control is operating. "0 V" voltage is present when main switch is turned OFF. |
| Ground | 6 | |
| Motor A | 7 | ON-and-OFF ("0 V"-and-battery voltage) operation is alternately repeated while cruise control is operating. "0 V" voltage is present when main switch is turned OFF. |
| RES/ACC switch | 9 | Battery voltage is present when switch is turned to RES/ACC position. "0 V" voltage is present when switch is released. |
| SET/COAST switch | 10 | Battery voltage is present when switch is turned to SET/COAST position. "0 V" voltage is present when switch is released. |
| Main power supply | 11 | Battery voltage is present when ignition switch is turned ON. "0 V" voltage is present when ignition switch is turned OFF. |
| Ignition switch | 12 | Battery voltage is present when ignition switch is turned ON. "0 V" voltage is present when ignition switch is turned OFF. |
| Motor C | 13 | ON-and-OFF ("0 V"-and-battery voltage) operation is alternately repeated while cruise control is operating. "0 V" voltage is present when main switch is turned OFF. |
| Motor clutch | 14 | ON-and-OFF ("0 V"-and-battery voltage) operation is alternately repeated while cruise control is operating. "0 V" voltage is present when vehicle is stopped. |
| Cruise control main switch | 15 | Battery voltage is present while the cruise control main switch is depressed. "0 V" voltage is present when cruise control main switch is turned OFF. |
| Brake switch | 16 | Leave clutch pedal released (MT model), while cruise control main switch is turned ON. Then check that; Battery voltage is present when brake pedal is released. "0" volt is present when brake pedal is depressed. Additionally for MT model, release the brake pedal with the cruise control main switch ON. Then check that; Battery voltage is present when clutch pedal is released. "0" volt is present when clutch pedal is depressed. |
| Data link connector | 17 | |
| Data link connector | 18 | |
| Vehicle speed sensor (MT model) TCM (AT model) | 19 | Lift-up the vehicle until all four wheels are raised off ground, and then rotate any wheel manually. Approx. "5" and "0" volt pulse signals are alternately input to cruise control module. |
| Stop light switch | 20 | Turn ignition switch to OFF. Then check that; Battery voltage is present when brake pedal is depressed. "0" volt is present when brake pedal is released. |
| NOTE: Voltage at terminals 5, 7, 13 and 14 cannot be checked unless vehicle is driving by cruise control operation. | ||
| NOTE |
|---|
| Voltage at terminals 5, 7, 13 and 14 cannot be checked unless vehicle is driving by cruise control operation. |
ELECTRICAL SPECIFICATION
GENERAL
The on-board diagnosis function of the cruise control system uses the Vehicle Diagnostic Interface.
The on-board diagnosis function operates in two categories, which are used depending on the type of problems
Cruise cancel conditions diagnosis
This category of diagnosis requires actual vehicle driving in order to determine the cause, (as when cruise speed is cancelled during driving although cruise cancel condition is not entered).
Cruise control module memory stores the cancel condition (Code No.) which occurred during driving. When there are plural cancel conditions (Code No.), they are shown on the Vehicle Diagnostic Interface.
| IMPORTANT | The cruise control memory stores not only the cruise "cancel" which occurred (although "cancel" operation is not entered by the driver), but also the "cancel" condition input by the driver. The content of memory is cleared when ignition switch or cruise control main switch is turned OFF. |
Real-time diagnosis
The real-time diagnosis function is used to determine whether or not the input signal system is in good order, according to signal emitted from switches, sensors, etc.
Vehicle cannot be driven at cruise speed because problem occurs in the cruise control system or its associated circuits.
Monitor the signal conditions from switches and sensors.
CHECK ACTUATOR MOTOR.
Turn the ignition switch to OFF.
Disconnect the harness connector from cruise control actuator.
Remove the cruise control actuator from mounting bracket.
Pull the cable by hand to check for looseness or status of inner gear engagement.
Are foreign particles caught in the inner gear or does inner gear engage and disengage improperly?
YES
Replace the cruise control actuator.
NO
Check the cruise control cable adjustment.