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.
DTC Confirmation Test
Malfunction is detected when mixture ratio compensation amount is too large (mixture is too lean or too rich). Possible causes are:
- Intake air leaks.
- Defective front HO2S.
- Defective injectors.
- Exhaust leaks.
- Fuel pressure incorrect.
- Lack of fuel.
- Defective MAF sensor.
To set DTC, start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Disconnect MAF sensor harness connector located near air cleaner. Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector. Select MODE 7 and ensure DTC P0100 is set. Select MODE 4 and erase first trip DTC. Start engine and let it idle for at least 10 minutes. Select MODE 7. If first trip DTC is detected, go to PROCEDURE . If engine does not start, fuel injection system has a malfunction. Attempt to start engine while depressing accelerator pedal. If engine starts, go to PROCEDURE . If engine still does not start, check for intake or exhaust leak.
NO RELATED
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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.