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U1000 CAN COMM CIRCUIT STC-131 < COMPONENT DIAGNOSIS > [WITH 4WAS] C D E F H I J K L M A B STC N O P U1000 CAN COMM CIRCUIT Description INFOID:0000000001666459 • CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many DTC Logic INFOID:0000000001666460 DTC DETECTION LOGIC 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 “U1000” detected? YES >> Proceed to diagnosis procedure. Refer to STC-131, "Diagnosis Procedure" . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000001666461 1. PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT) Perform 4WAS main control unit self-diagnosis. YES >> Perform CAN diagnosis. NO >> INSPECTION END. Special Repair Requirement INFOID:0000000001666462 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”. DTC Items (CONSULT-III screen terms) Diagnostic item is detected when... Possible cause U1000 CAN COMM When 4WAS main control unit is not transmitting or re- CAN communication er- |