Diagnosis Procedure

1. Turn ignition switch OFF.
2. Check ground connections M16, M70. Refer to "GROUND INSPECTION ".

   Is the inspection result normal? 

   YES: GO TO 2.

   NO: Repair or replace ground connections.

1. Disconnect mass air flow (MAF) sensor (intake air temperature sensor is built-in) (bank 1) harness connector.
2. Turn ignition switch ON.
3. Check the voltage between MAF sensor (bank 1) harness connector and ground.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   MAF sensor (bank 1)		Ground	Voltage (V)
   Connector	Terminal
   F14	5	Ground	Approx. 5

   Fig 1: Checking Voltage Between Mass Air Flow Sensor Terminal 5 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: GO TO 3.

   NO: Repair open circuit, short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between MAF sensor (bank 1) harness connector and ECM harness connector.
   CONNECTOR TERMINAL CONTINUITY CHART
   
   

   MAF sensor (bank 1)		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   F14	6	F106	68	Existed

4. 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.

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 "DESCRIPTION ".

INSPECTION END