Inspection Procedure 1: The Scan Tool Cannot Communicate With TC-SST-ECU

INSPECTION PROCEDURE 1: The scan tool cannot communicate with TC-SST-ECU.

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

COMMENTS ON TROUBLE SYMPTOM
The CAN bus line, TC-SST-ECU power supply circuit, or TC-SST-ECU may have a problem.

PROBABLE CAUSES
^ Wrong M.U.T.-III wiring harness
^ The CAN bus line is defective.
^ Malfunction of TC-SST-ECU power supply circuit
^ Malfunction of TC-SST-ECU
^ ECU malfunction of other system

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: Check and repair the TC-SST-ECU power supply circuit.
NO: Repair the CAN bus lines.