Symptom Diagnosis

2004 Toyota Matrix XR, FWD, StandardSECTION Symptom Diagnosis
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.

Perform symptom diagnosis when no DTCs are present, but symptom still occurs. See SYMPTOM DIAGNOSIS  table, then see specified procedure or appropriate test under DIAGNOSTIC TESTS , SYSTEM TESTS  or COMPONENT TESTS  .

SYMPTOM DIAGNOSIS

Symptom Circuit (1) DTC Or Procedure
ABS Does Not Operate (2) Check DTC, Confirm Normal DTC Is Output RETRIEVING DIAGNOSTIC TROUBLE CODES 
IG Power Source Circuit DTC C1241/ 41 
Speed Sensor Circuit DTC 31, 32, 33 & 34 
Check Hydraulic Circuit For Leaks Visual Inspection
ABS Inoperative Intermittently(2) Check DTC, Confirm Normal DTC Is Output RETRIEVING DIAGNOSTIC TROUBLE CODES 
Speed Sensor Circuit DTC 31, 32, 33 & 34 
Stoplight Switch Circuit DTC C1249/ 49 
Check Hydraulic Circuit For Leaks Visual Inspection
ABS Warning Light Abnormal ABS Warning Light Circuit ABS WARNING LIGHT 
ABS ECU ABS LIGHT ON: ABS ECU MALFUNCTION 
Unable To Perform DTC Check (2) ABS Warning Light Circuit ABS WARNING LIGHT 
Tc Terminal Circuit Tc TERMINAL 
Unable To Check Speed Sensor Signal Ts Terminal Circuit Ts TERMINAL 
Check ABS ECU Circuits ABS LIGHT ON: ABS ECU MALFUNCTION 
(1) Check circuits in order given.
(2) If all circuits check okay and problem still occurs, replace ABS ECU.
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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.