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, FWD, AutomaticFACTORY OEM SERVICE PROCEDURE
Malfunction Indicator Light Inspection
NOTE:
The CHECK engine light, located on instrument cluster, is referred to as malfunction indicator light (MIL). Inspect MIL to ensure it is operational and will come on if a diagnostic trouble code (DTC) is set.
- The MIL comes on when ignition switch is turned ON and engine is not running. If MIL does not light up, trouble shoot combination meter. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT.
- When engine starts, MIL should go off. If lamp remains on, it means diagnosis system has detected a malfunction or abnormality in system. See RETRIEVING DIAGNOSTIC TROUBLE CODES .
Factory Service Tools
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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.
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