Inspection Procedure 2

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. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Scan tool data list

Item No.32: Drive mode switch (Refer to data list reference table Data List Reference Table.)

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
NO Go to Step 3.
STEP 3. Twin clutch SST control mode switch check

Refer to Testing and Inspection

Q. Is the check result normal?

YES Go to Step 4.
NO Replace the twin clutch SST control mode switch. (Refer to Service and Repair.)
STEP 4. Twin clutch SST control mode switch connector check: C-27-2

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. (Refer to Service and Repair.)

(2)Verify that the condition described by the customer exists.

Q. Does a malfunction take place again?

YES Replace the transaxle assembly. (Refer to Removal and Replacement.)
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)