Inspection Procedure 2
Inspection Procedure 2: When the Clutch Pedal is Depressed, Cruise Control is not Cancelled [M/T].
CIRCUIT OPERATION
- Terminal number 85 of the ECM connector B-27 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 connector B-27 terminal number 85 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
DIAGNOSTIC PROCEDURE
STEP 1. Using scan tool MB991958, check data list item 78: Clutch switch.
(1)
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.
Connect scan tool MB991958 to the data link connector (Refer to 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 (Refer to Scan Tool Testing and Procedures.)
- 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-27 and clutch switch connector C-229, for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Harness Connector Inspection.
Q. Are the connectors and terminals 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-27 terminal number 85 and clutch switch connector C-229 terminal number 2, and between clutch switch connector C-229 terminal number 1 and body ground, for damage.
Check harness wire for open/short circuit and damage.
Q. Are 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.
Testing and Inspection.
Q. Is the clutch switch operating properly?
YES Go to Step 5.
NO Replace the clutch switch Service and Repair.) 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 (Refer to 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 (Refer to Scan Tool Testing and Procedures.)
- 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 [ Removal and Replacement.] Then go to Step 7.
STEP 6. Check the symptom.
Q. When the clutch pedal is depressed, is the cruise control cancelled?
YES It can be assumed that this malfunction is intermittent How to Cope With Intermittent Malfunctions.)
NO Replace the ECM [ Removal and Replacement.] Then go to Step 7.
STEP 7. Check the symptom.
Q. When the clutch pedal is depressed, is the cruise control cancelled?
YES The procedure is complete.
NO Return to Step 1.