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STC-82 < COMPONENT DIAGNOSIS > [WITH 4WAS] U1000, U1002 4WAS COMMUNICATION CIRCUIT U1000, U1002 4WAS COMMUNICATION CIRCUIT Description INFOID:0000000000958816 • 4WAS front control unit and 4WAS main control unit transmit/receive information to/from each other for opti- mum control of the 4WAS system with the specified 4WAS system line (4WAS communication line) between • Be careful to repair wirings because 4WAS system specified line adopt a twisted wire. Refer to "Precautions for Harness Repair" DTC Logic INFOID:0000000000958817 DTC DETECTION LOGIC *: Communication line between 4WAS front control unit and 4WAS main control unit DTC CONFIRMATION PROCEDURE 1. RECHECK DTC With CONSULT-III 1. Turn the ignition switch OFF to ON. 2. Perform 4WAS front control unit self-diagnosis. Is DTC “U1000” or “U1010” detected? YES >> Proceed to diagnosis procedure. Refer to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000000958818 1. CHECK COMMUNICATION LINE (1) 1. Turn the ignition switch OFF. 2. Disconnect ABS actuator and electric unit (control unit) harness connector. 3. Disconnect yaw rate/side G sensor harness connector. 4. Disconnect 4WAS front control unit harness connector. 5. Disconnect 4WAS main control unit harness connector. 6. Check the continuity between ABS actuator and electric unit (control unit) harness connector and yaw Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace the harnesses and connectors. Refer to STC-176, "Precautions for Harness 2. CHECK COMMUNICATION LINE (2) DTC Items Diagnostic item is detected when... Possible cause U1000 CAN COMM CIRCUIT When 4WAS front control unit is not transmitting or re- 4WAS communication U1002 SYSTEM COMM(CAN) When 4WAS front control unit is not transmitting or re- 4WAS communication ABS actuator and electric unit (control unit) Yaw rate/side G sensor. Continuity Connector Terminal Connector Terminal E41 25 M143 2 Existed 45 3 |