Inspection Procedure
1: M.U.T.-III communication with ABS system is impossible.
caution
If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
COMMENTS ON TROUBLE SYMPTOM
When M.U.T.-III cannot communicate with the ABS system, the CAN bus lines, ABS-ECU power
supply circuit system, earth, or ABS-ECU may be faulty.
PROBABLE CAUSES
Damaged wiring harness and connectors
Malfunction of the hydraulic unit assembly (integrated with ABS-ECU)
Wrong routing of M.U.T.-III harness
Abnormality in battery or alternator
Abnormality in power supply voltage to ABS-ECU
ECU malfunction of other system
M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Check the power supply circuit, and repair if necessary (Refer to ).
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).