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.
1990 Toyota Corolla Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Check Engine Light
- Check engine light will come on when ignition switch is in "ON" position and engine is not running. When engine is started, "CHECK ENGINE" light should go off. If light remains on while engine is running, trouble code is present.
- If light did not come on with key on and engine off, the "CHECK ENGINE" light circuit must be checked before continuing. Perform the "DIAGNOSTIC CIRCUIT CHECK" for the particular model. Circuit checks are located with the trouble code charts.
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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