Inspection Procedure 1: Communication Between M.U.T.-III and the ABS-ECU is not Possible.




caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Diagnose the CAN bus lines before the diagnosis codes (Refer to GROUP 54C, CAN bus-line diagnostic flow ).

TECHNICAL DESCRIPTION (COMMENT)


If the M.U.T.-III cannot communicate with the ABS system, the CAN bus lines may be defective. If the ABS system does not work, the ABS-ECU or its power supply circuit may be defective.

PROBABLE CAUSES



DIAGNOSIS

STEP 1. M.U.T.-III CAN bus diagnostics


caution Before connecting or disconnecting the M.U.T.-III, turn the ignition switch to the "LOCK" (OFF) position.
Use M.U.T.-III to diagnose the CAN bus lines.
(1)Connect M.U.T.-III to the 16-pin diagnosis connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.

Q. Is the check result normal?

Check and repair the power supply circuit system (Refer to GROUP 16, Alternator output line voltage drop test ).

Repair the CAN bus lines (Refer to GROUP 54C, CAN bus line Diagnostic flow ).