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Home >> Toyota >> 1998 >> Avalon XLS >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System - With Traction Control >> Diagnostic Tests >> Diagnostic Trouble Codes Light Always On: Abs/TRAC Ecu Malfunction >> Diagnostic Procedure

Diagnostic Procedure

  1. Retrieve DTCs. See RETRIEVING DTCS under DIAGNOSIS & TESTING . If DTC is output using ABS warning light and TRAC OFF indicator light, perform appropriate test under DIAGNOSTIC TESTS . If ABS warning light and TRAC OFF indicator light do not operate normal, go to next step. If ABS warning light and TRAC OFF indicator light operate normal (lights blink 2 times per second and no DTCs are present), check for short circuit in wiring harness between solenoid relay and DLC1. Repair as necessary. See WIRING DIAGRAMS .
  2. If ABS warning light is on, go to next step. If ABS warning light is off, check for open or short circuit in wiring harness between ECU-IG fuse and ABS/TRAC ECU. Repair as necessary. See WIRING DIAGRAMS .
  3. Start engine and check charging system voltage. If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, diagnose charging system. Repair as necessary.
  4. Turn ignition off. Disconnect ABS/TRAC ECU connectors. Turn ignition switch to ON position. Ensure ABS warning light and TRAC OFF indicator light turn off. If lights turn off, replace ABS/TRAC ECU. If lights do not turn off, check for short circuit in wiring harness between ABS warning light, DLC1, DLC2 and ABS/TRAC ECU. Repair as necessary. See WIRING DIAGRAMS .
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