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C1909 4WAS MAIN CONTROL UNIT STC-95 < COMPONENT DIAGNOSIS > [WITH 4WAS] C D E F H I J K L M A B STC N O P • Open between the ignition switch and 4WAS main control unit harness connector No. 27 termi- nal • Ignition switch 2. CHECK 4WAS MAIN CONTROL UNIT GROUND Check the continuity between 4WAS main control unit harness connector and the ground. Is the inspection result normal? YES >> GO TO 3. NG >> Repair or replace the harnesses and connectors. 3. PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT) With CONSULT-III 1. Connect 4WAS main control unit harness connector. 2. Perform 4WAS main control unit self-diagnosis. Is DTC “C1909” detected? YES >> Replace 4WAS main control unit. Refer to NO >> GO TO 4. 4. CHECK INFORMATION With CONSULT-III Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to . Is each data the standard value? YES >> Check each harness connector pin terminal for disconnection. NO >> Replace 4WAS main control unit. Refer to Special Repair Requirement INFOID:0000000001666404 BEFORE REPLACING 4WAS MAIN CONTROL UNIT • Record the self-diagnosis results (history). CAUTION: • Never erase the memory (history) of self-diagnosis results when replacing 4WAS main control unit after diagnosis. • Erase the memory of the self-diagnosis results (record) after printing out or recording all the val- ues of “DATA MONITOR”. 4WAS main control unit Continuity Connector Terminal B54 34 – Ground Existed |