Inspection Procedure 11

INSPECTION PROCEDURE 11: TCL/ASC System does not Operate.

COMMENT

The fail-safe function is probably canceling TCL/ASC system. In this case, scan tool MB991958 can be used to Retest each system by checking the diagnostic trouble codes.

TROUBLESHOOTING HINTS (The most likely causes for this case:)

- Malfunction of the CAN bus line.
- Malfunction of the TCL/ASC-ECU.

DIAGNOSIS

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. Hydraulic unit check

Refer to Testing and Inspection.

Q. Is the hydraulic unit normal?

YES Go to Step 2.
NO Connect the brake pipes correctly, repair the external brake lines, or replace the hydraulic unit.
STEP 2. Verify that the condition described by the customer exists.

Q. Can any faults be found with the brake operation?

YES Check the brake system related components except the ASC system.
NO The procedure is complete.