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REAR AXLE – Troubleshooting <AYC> 27-6 4. INSPECTION PROCEDURES FOR DIAGNOSIS CODES Code No. 12: Power supply voltage (valve power supply) Probable cause This code is output when the AYC-ECU power supply voltage drops below, goes D Defective harness or connector D Defective battery D Defective AYC-ECU NOTE Is the battery voltage correct? NG Replace OK Measure at B-96 AYC-ECU connector. D Disconnect the connector and D Ignition switch: ON D Voltage across 31 and body ground NG Check the following connectors: OK Check the trouble symptom. NG Check and repair harness between 2 ) and AYC-ECU. OK Replace AYC-ECU. NG Repair Code Nos. 21, 22, 23, 24: Wheel speed sensor system Probable cause This code is output if any one of three wheel speed sensors fails to provide an input D Defective harness or connector D Defective ABS-ECU D Defective AYC-ECU <Vehicles with ABS> NG Replace AYC-ECU. OK Replace ABS-ECU. NG Check harness between AYC-ECU NG Repair OK Check the trouble symptom. Is an ABS diagnosis code No. 21, 22, YES Refer to Group 35B – Troubleshooting NO Measure at B-95 AYC-ECU connector. D Disconnect the connector and D Ignition switch: ON D Turn tire at 1/2 to 1 revolution/sec. D Voltage across 6/7/8/9 and body sured with a circuit tester) OK Check the following connector: OK Check the trouble symptom. NG Check the following connectors: NG Repair NG Repair |