4WAS Communication Circuit

U1010 4WAS COMMUNICATION CIRCUIT

Description
^ 4WAS front control unit and 4WAS main control unit transmit/receive information to/from each other for optimum control of the 4WAS system with the specified 4WAS system line (4WAS communication line) between 4WAS front control unit and 4WAS main control unit.
^ Be careful to repair wirings because 4WAS system specified line adopts twisted-pair wires. Refer to STC-176, "Precautions for Harness Repair". With 4WAS

DTC Logic

U1010:

DTC CONFIRMATION PROCEDURE

1.RECHECK DTC

With CONSULT-III
1. Turn the ignition switch from OFF to ON.
2. Perform 4WAS front control unit self-diagnosis.
Is DTC "U1010" detected?
YES >> Proceed to diagnosis procedure. Refer to "Diagnosis Procedure".
NO >> INSPECTION END

Diagnosis Procedure

1.4WAS FRONT CONTROL UNIT
Check that there is no malfunction in 4WAS front control unit harness connector or disconnection.
Is the inspection result normal?
YES >> Replace 4WAS front control unit.
NO >> Repair or replace the harnesses and connectors. Refer to STC-176, "Precautions for Harness Repair". With 4WAS

Special Repair Requirement

BEFORE REPLACING 4WAS FRONT CONTROL UNIT
^ Record the self-diagnosis results (history).

CAUTION:
^ Never erase the memory (history) of self-diagnosis results when replacing 4WAS front control unit after diagnosis.
^ Erase the memory of the self-diagnosis results (record) after printing out or recording all the values of "DATA MONITOR".

AFTER REPLACING 4WAS FRONT CONTROL UNIT
^ Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to STC-28, "4WAS FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT: Special Repair Requirement (Pattern 3)". 4WAS Front Actuator Neutral Position Adjustment