Inspection Procedure 1: Scan tool (M.U.T.-IIISE) communication with ABS/ASC system is impossible.
caution
If there is any problem in the CAN bus lines, an incorrect DTC 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.
If the power is supplied with the ground circuit of CAN communication device open circuited, an electric potential abnormality may occur to the CAN bus lines.
COMMENTS ON TROUBLE SYMPTOM
When scan tool (M.U.T.-IIISE) cannot communicate with the ABS/ASC system, the CAN bus lines, ASC-ECU power supply circuit system, ground, or ASC-ECU may be faulty.
PROBABLE CAUSES
Damaged wiring harness and connectors
ASC-ECU malfunction
Wrong routing of scan tool (M.U.T.-IIISE) harness
Abnormality in battery or generator
Abnormality in power supply voltage to ASC-ECU
ECU malfunction of other system
DIAGNOSIS
1. Check scan tool (M.U.T.-IIISE) CAN bus diagnosis