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.
2003 Toyota Matrix Base, 4WDFACTORY OEM SERVICE PROCEDURE
Clearing Diagnostic Trouble Codes
NOTE:
If hand-held tester switches ECM from normal mode to check mode or vise versa, or if ignition switch is turned from ON to ACC or OFF during check mode, DTCs and freeze frame data will be erased.
The DTC and freeze frame data will be erased by either action:
- Operating OBD II scan tool (complying with SAE J1978) or hand-held tester to erase codes. For operating instructions, see OBD II scan tool's instruction book.
- Disconnecting battery terminals or EFI 1 fuse.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.