Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

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
1. Turn ignition switch OFF.
2. Check ground connection M95. Refer to Ground Inspection in "CIRCUIT INSPECTION ".
  Is the inspection result normal?
  
  YES: GO TO 3.
  
  NO: Repair or replace ground connection.

CHECK MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR POWER SUPPLY CIRCUIT CIRCUIT FOR OPEN AND SHORT

Disconnect manifold absolute pressure (MAP) sensor harness connector.
Turn ignition switch ON.

Check the voltage between manifold absolute pressure (MAP) sensor harness connector and ground.

VOLTAGE REFERENCE CHART

Manifold absolute pressure (MAP) sensor		Ground	Voltage (V)
Connector	Terminal	Ground	Voltage (V)
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 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect ECM harness connector.

Check the continuity between manifold absolute pressure (MAP) sensor harness connector and ECM harness connector.

CONTINUITY REFERENCE CHART

Manifold absolute pressure (MAP) sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F65	3	F111	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 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check the continuity between manifold absolute pressure (MAP) sensor harness connector and ECM harness connector.

CONTINUITY REFERENCE CHART

Manifold absolute pressure (MAP) sensor		ECM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
F65	2	F111	69	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 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
Refer to "COMPONENT INSPECTION ".

Is the inspection result normal?

YES: GO TO 7.

NO: Replace manifold absolute pressure (MAP) sensor. Refer to "EXPLODED VIEW ".
CHECK INTERMITTENT INCIDENT
Refer to "INTERMITTENT INCIDENT ".

INSPECTION END