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.
Diagnosis Procedure
- CHECK INTAKE SYSTEM
Check the following for connection.
- Air duct
- Vacuum hoses
- Intake air passage between air duct and intake manifold.
Is the inspection result normal?
YES: GO TO 2.
NO: Repair or replace ground connection.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E21 and E38. Refer to Ground Inspection in
"CIRCUIT INSPECTION
".
Is the inspection result normal?
YES: GO TO 3.
NO: Repair or replace ground connection.
- CHECK MAP SENSOR POWER SUPPLY CIRCUIT
- Disconnect manifold absolute pressure (MAP) sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between MAP sensor harness connector and ground.
MAP sensor Ground Voltage (V) Connector Terminal F65 1 Ground Approx. 5 Is the inspection result normal?
YES: GO TO 4.
NO: Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK MAP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAP sensor harness connector and ECM harness connector.
MAP sensor ECM Continuity Connector Terminal Connector Terminal F65 3 F110 70 Existed - Also check harness for short to ground and power.
Is the inspection result normal?
YES: GO TO 5.
NO: Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK MAP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between MAP sensor harness connector and ECM harness connector.
MAP sensor ECM Continuity Connector Terminal Connector Terminal F65 2 F110 67 Existed - Also check harness for short to ground and power.
Is the inspection result normal?
YES: GO TO 6.
NO: Repair open circuit, short to ground or short to power in harness or connectors.
- Check the continuity between MAP sensor harness connector and ECM harness connector.
- CHECK MAP SENSOR
Refer to "COMPONENT INSPECTION (MAP SENSOR) ".
Is the inspection result normal?
YES: GO TO 7.
NO: Replace MAP sensor.
- CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".
: INSPECTION END
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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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