Diagnosis Procedure
WARNING: This page is about a different car, the 2011 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".
Is the inspection result normal?
YES: GO TO 2.
NO: Repair or replace ground connection.
- CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
- Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) (bank 1) harness connector.
- Turn ignition switch ON.
- Check the voltage between MAF sensor (bank 1) harness connector and ground.
TERMINAL VOLTAGE REFERENCE CHARTMAF sensor (bank 1) Ground Voltage (V) Connector Terminal F31 2 Ground Approx. 5 Is the inspection result normal?
YES: GO TO 3.
NO: Repair open circuit, short to ground or short to power in harness or connectors.
- CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between MAF sensor (bank 1) harness connector and ECM harness connector.TERMINAL CONTINUITY REFERENCE CHART
MAF sensor (bank 1) ECM Continuity Connector Terminal Connector Terminal F31 1 F102 68 Existed - Also check harness for short to ground and short to power.
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 INTAKE AIR TEMPERATURE SENSOR
Refer to "COMPONENT INSPECTION ".
Is the inspection result normal?
YES: GO TO 5.
NO: Replace MAF sensor (with intake air temperature sensor) (bank 1). Refer to "REMOVAL AND INSTALLATION ".
- CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".
INSPECTION END