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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Toyota Tundra, 2002 Toyota Tundra, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for poor connections at ABS ECU connector. Repair as necessary. If connections are okay, retrieve DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no DTCs are present, go to next step.
  2. Disconnect ABS ECU connector. Turn ignition to ON position. Measure voltage between ABS ECU connector terminals IG1 and GND. See ABS ECU PIN VOLTAGES . If voltage reading is between 10-14 volts, go to next step. If voltage is not as specified, check for open or short circuit in wiring between ECU-IG fuse and ABS ECU. See WIRING DIAGRAMS . Repair as necessary.
  3. To check combination meter, use fused jumper wire to connect ABS ECU connector terminals WA and GND together. See ABS ECU PIN VOLTAGES . Turn ignition to ON position. If ABS warning light goes on, go to next step. If ABS warning light does not go on, repair or replace combination meter assembly.
  4. Turn ignition OFF. Disconnect fused jumper wire from ABS ECU connector. Turn ignition to ON position. If ABS warning light goes off, replace ABS ECU. See ABS ECU/ACTUATOR  under REMOVAL & INSTALLATION. If ABS warning light is still ON, check for short circuit between ABS warning light, DLC3 and ABS ECU. See WIRING DIAGRAMS . Repair as necessary.
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