Inspection Procedure 3

When the Clutch Pedal is Depressed, Auto-cruise Control is not Cancelled

Clutch Pedal Position Switch Circuit Part 1:

Clutch Pedal Position Switch Circuit Part 2:

CIRCUIT OPERATION
This circuit indicates the operation status of the clutch pedal position switch. When the clutch pedal position switch is ON (clutch pedal is depressed), the voltage of auto-cruise control-ECU terminal number 13 will indicate 0 volt.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a malfunction of the clutch pedal position switch circuit.

TROUBLESHOOTING HINTS
- Malfunction of the clutch pedal position switch.
- Damaged harness or connector.
- Malfunction of the auto-cruise control-ECU.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the clutch pedal position switch.




1. Disconnect clutch pedal position switch connector C-130.







2. Measure the continuity between the terminals.

Q: Is the clutch pedal position switch in good condition?

YES: Go to Step 2.

NO: Replace the clutch pedal position switch. Then check that the malfunction is eliminated.

STEP 2. Measure the signal voltage at auto-cruise control-ECU connector C-107 by backprobing.

1. Remove the auto-cruise control-ECU mounting nut.




2. Do not disconnect auto-cruise control switch connector C-107.
3. Turn the ignition switch to the "ON" position.




4. Measure the voltage between auto-cruise control-ECU connector C-107 terminal 13 and ground by backprobing.
- voltage should measure 0.5 volts or less. (When clutch pedal is depressed.)
- voltage should measure battery positive voltage. (When clutch pedal is not depressed.)

5. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Are all of the measured voltages satisfied?

YES: Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.

NO: Go to Step 3.













STEP 3. Check clutch pedal position switch connector C-130, auto-cruise control-ECU connector C-107, intermediate connectors C-108 and C-129 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES: Go to Step 4.

NO: Repair or replace connector. Then check that the malfunction is eliminated.







STEP 4. Check the harness wire between clutch pedal position switch connector C-130 terminal 2 and auto-cruise control-ECU connector C-107 terminal 13 for damage.

Q: Is the harness wire in good condition?

YES: Go to Step 5.

NO: Repair the harness wire and then check that the malfunction is eliminated.




STEP 5. Check the harness wire between clutch pedal position switch connector C-130 terminal 1 and ground wire for damage.

Q: Is the harness wire in good condition?

YES: Check that the malfunction is eliminated. If the malfunction is eliminated, replace the auto-cruise control-ECU. Then check that the malfunction is eliminated.

NO: Repair the harness wire and then check that the malfunction is eliminated.