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C1931 4WAS FRONT CONTROL UNIT COMMUNICATION STC-127 < COMPONENT DIAGNOSIS > [WITH 4WAS] C D E F H I J K L M A B STC N O P C1931 4WAS FRONT CONTROL UNIT COMMUNICATION Description INFOID:0000000001878427 • 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 adopts twisted-pair wires. Refer to 176, "Precautions for Harness Repair" DTC Logic INFOID:0000000001666454 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 from OFF to ON. 2. Perform 4WAS main control unit self-diagnosis. Is DTC “C1931” detected? YES >> Proceed to diagnosis procedure. Refer to STC-127, "Diagnosis Procedure" . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000001666455 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) Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground. DTC Items (CONSULT-III screen terms) Diagnostic item is detected when... Possible cause C1931 4WAS FRONT ECU COMM 4WAS communication line* data communication error 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 |