Inspection Procedure 6

INSPECTION PROCEDURE 6: Gears cannot be changed with the manual mode.

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

COMMENTS ON TROUBLE SYMPTOM

The CAN bus lines, shift lever assembly, or mechatronic assembly may have a problem.

PROBABLE CAUSES

- Malfunction of the CAN bus lines
- Malfunction of the shift lever assembly
- Malfunction of the mechatronic assembly

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.

Shift lever item No.1: Lever position (Refer to Data List Reference Table).

(1)Confirm that "Manual" is displayed when the shift lever position is in the manual mode.

(2)Confirm that "+" is displayed when the shift lever position is upshifted and held, and "-" is displayed when the shift lever position is downshifted and held.

Q. Is the check result normal?

YES Go to Step 3.
NO Replace the shift lever assembly. (Refer to Service and Repair.)
STEP 3. Retest the system.

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.)