Inspection Procedure 1: the Scan Tool Cannot Communicate With the Shift Lever-ECU

INSPECTION PROCEDURE 1: The scan tool cannot communicate with the shift lever-ECU.

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

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

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

DIAGNOSTIC PROCEDURE

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 shift lever-ECU power supply circuit. (Inspection Procedure 6: Shift Lever-ECU Power Supply Circuit Abnormality)
NO: Repair the CAN bus lines.