Inspection Procedure 2
Inspection Procedure 2: When the Clutch Pedal is Depressed, Cruise Control is not Cancelled [M/T.]Clutch Switch System Circuit:
CIRCUIT OPERATION
- Terminal number 85 of the ECM connector B-109 monitors the clutch switch state.
- The clutch switch turns ON/OFF when the clutch pedal is depressed/released, and the input signal to the ECM changes. According to this change, the ECM judges the clutch switch status.
COMMENT
The cause is probably a malfunction of the clutch switch circuit.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Damaged harness or connector.
- Malfunction of the clutch switch.
- Malfunction of the ECM.
DIAGNOSIS PROCEDURE
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Using scan tool MB991958, check data list item 78: Clutch switch.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector. Reading and Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading and Clearing Diagnostic Trouble Codes
- Item 78: Clutch switch.
- When the clutch pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the clutch pedal is released, the display on scan tool MB991958 should be "OFF."
Q: Is the switch operating properly?
YES : Go to Step 6.
NO : Go to Step 2.
STEP 2. Check ECM connector B-109 and clutch switch connector C-42, for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is the connector and terminal in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged connector. Then go to Step 7.
STEP 3. Check the harness wire between ECM connector B-109 terminal number 85 and clutch switch connector C-42 terminal number 2, and between clutch switch connector C-42 terminal number 1 and body ground, for damage.
- Check harness wire for open/short circuit and damage.
Q: Is the harness wires in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged harness wire. Then go to Step 7.
STEP 4. Check the clutch switch.
Refer to On-vehicle Service - Clutch Switch Check. Testing and Inspection
Q: Is the clutch switch operating properly?
YES : Go to Step 5.
NO : Replace the clutch switch. Then go to Step 7.
STEP 5. Using scan tool MB991958, check data list item 78: Clutch switch.
1. Connect scan tool MB991958 to the data link connector. Reading and Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading and Clearing Diagnostic Trouble Codes
- Item 78: Clutch switch.
- When the clutch pedal is depressed, the display on scan tool MB991958 should be "ON."
- When the clutch pedal is released, the display on scan tool MB991958 should be "OFF."
Q: Is the switch operating properly?
YES : Go to Step 6.
NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 7.
STEP 6. Check the symptoms.
Q: When the clutch pedal is depressed, is the cruise control cancelled?
YES : It can be assumed that this malfunction is intermittent.
NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 7.
STEP 7. Check the symptoms.
Q: When the clutch pedal is depressed, is the cruise control cancelled?
YES : The procedure is complete.
NO : Return to Step 1.