Inspection Procedure 2
INSPECTION PROCEDURE 2: When the Clutch Pedal is Depressed, Auto-cruise Control System is not CancelledClutch Switch System Circuit:
CIRCUIT OPERATION
This circuit indicates the operation status of the clutch switch. When the clutch switch is ON (clutch pedal is depressed), the voltage of ECM terminal 42 will indicate 0 volt.
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
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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. Reading 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".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 7.
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: Are the connectors and terminals in good condition?
YES : Go to Step 3.
NO : Repair or replace the faulty connector (Refer to General (Electrical), Harness Connector Inspection). Then go to Step 8.
STEP 3. Check the harness wire between ECM connector B-109 terminal 85 and clutch switch connector C-42 terminal 2 for damage.
Q: Is the harness wires in good condition?
YES : Go to Step 4.
NO : Repair the damaged harness wire. Then go to Step 8.
STEP 4. Check the harness wire between clutch switch connector C-42 terminal 1 and ground for damage.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair the damaged harness wire. Then go to Step 8.
STEP 5. Check the clutch switch.
1. Disconnect clutch switch connector C-42.
2. Measure the continuity between the terminals.
3. Connect clutch switch connector C-42.
Q: Is the clutch switch operating properly?
YES : Go to Step 6.
NO : Replace the clutch switch (Refer to Clutch, Clutch Pedal and Master Cylinder). Then go to Step 8.
STEP 6. Using scan tool MB991958, check data list item 78: Clutch switch.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. Reading 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".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 7.
NO : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Troubleshooting - ID Code Registration Judgment Table). Then go to Step 8.
STEP 7. Check the symptoms.
Q: When the brake pedal is depressed, auto-cruise control system is cancelled?
YES : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).
NO : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Wireless Control Module, Troubleshooting -ID Code Registration Judgment Table). Then go to Step 8.
STEP 8. Check the symptoms.
Q: When the clutch pedal is depressed, auto-cruise control system is cancelled?
YES : The procedure is complete.
NO : Return to Step 1.