Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 226 (ANTI-LOCK BRAKE SYSTEM)SYSTEM TESTSTEST A: ABS ECU MALFUNCTION (ABS LIGHT ON)DIAGNOSTIC PROCEDURE
2004 Toyota Matrix XR, FWD, Standard
Diagnostic Procedure
2004 Toyota Matrix XR, FWD, StandardSECTION 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.
- 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.
- 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.
- 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.
- 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.