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.
Diagnostic Procedure
- CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check harness continuity between ECM terminal 78 and body ground. Refer to Wiring Diagram.
Continuity should exist.
- Also check harness for short to power.
OK or NG
- OK: GO TO 3 .
- NG: GO TO 2.
- DETECT MALFUNCTIONING PART
- Check the following.
- Harness connectors F66, M229
- Harness connectors M6, B3
- Harness for open between ECM and body ground
- Replace open circuit or short to power in harness or connectors.
- Check the following.
- CHECK FUEL LEVEL SENSOR
Refer to FUEL LEVEL SENSOR UNIT CHECK .
OK or NG
- OK: GO TO 4.
- NG: Replace fuel level sensor unit.
- CHECK INTERMITTENT INCIDENT
Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .
OK or NG
- INSPECTION END
Use the Manual With the Right Hardware
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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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