Inspection Procedure 2: The Driving Mode Cannot Be Changed

INSPECTION PROCEDURE 2: The driving mode cannot be changed.








CAUTION
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

COMMENTS ON TROUBLE SYMPTOM
The twin clutch SST control mode switch, or TC-SST-ECU may have a problem.

PROBABLE CAUSES
^ Malfunction of the twin clutch SST control mode switch
^ Damaged harness wires and connectors
^ Malfunction of the shift lever-ECU
^ Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Scan tool service data
Item No. 32: Drive mode switch (Data List Reference Table)
Q: Is the check result normal?
YES: Intermittent malfunction.
NO: Go to Step 3.

STEP 3. Twin clutch SST control mode switch check
Q: Is the check result normal?
YES: Go to Step 4.
NO: Replace the twin clutch SST control mode switch.

STEP 4. Twin clutch SST control mode switch connector check
Check for the contact with terminals.
Q: Is the check result normal?
YES: Go to Step 5.
NO: Repair the defective connector.

STEP 5. Retest the system
Q: Does a malfunction take place again?
YES: Go to Step 6
NO: The inspection is complete.

STEP 6. Trouble symptom recheck after replacing the shift lever assembly
1) Replace the shift lever assembly.
2) Verify that the condition described by the customer exists.
Q: Does a malfunction take place again?
YES: Replace the mechatronic assembly.
NO: Intermittent malfunction.