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 746 (CAN COMMUNICATION SYSTEM - DIAGNOSIS)DIAGNOSTIC TROUBLE CODE CHART

2004 Toyota Matrix XR, FWD, Standard

Diagnostic Trouble Code Chart

2004 Toyota Matrix XR, FWD, StandardSECTION Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

DTC COMBINATION TABLE
NOTE: Complete "CHECK CAN BUS LINE" (see CHECK CAN BUS LINE ), to confirm that there is no disconnection in the CAN main bus lines and there is short circuit, short to +B or short to ground in CAN main bus lines, and then perform troubleshooting according to the DTC combination table.
1. Confirm the trouble mode according to the combination of output DTCs.
  
  Fig 1: Trouble Mode Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  - U0121/94, U0123/62, U0124/95 and U0126/63 are the DTCs in the CAN communication system.
  - The above table shows combinations of these DTCs.
  - O . . . . . DTCs that are being output.
  - - . . . . . DTCs that are not being output.
2. Confirm the trouble mode by referring to Fig 1. Then check the parts to be replaced, by referring to Fig 2.
  
  Fig 2: Output Code Reference Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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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.