Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. See Figure .

   Refer to GROUND INSPECTION  .

OK or NG

1. OK: go to 2.
2. NG: Repair or replace ground connections.

1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.

   For mass air flow sensor & intake air temperature sensor location, see Figure .

3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.
   Fig 1: MAF Sensor Terminals 2 & 4 Specifications

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

OK or NG

1. OK: go to  4 .
2. NG: go to 3.
   Fig 2: Checking Voltage Between MAF Sensor Terminals 2, 4 & Ground (W/DVOM)

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

Check the following.

• Harness connectors E211, M41
• Harness connectors M82, F102
• Harness for open or short between IPDM E/R and mass air flow sensor
• Harness for open or short between mass air flow sensor and ECM
  1. Repair open circuit or short to ground or short to power in harness or connectors.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67. Refer to wiring diagram. See Figure .
   1. Continuity should exist  .
4. Also check harness for short to ground and short to power.

OK or NG

1. OK: go to 5.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Check harness continuity between MAF sensor terminal 1 and ECM terminal 51.

   Refer to wiring diagram. See Figure .

   1. Continuity should exist  .
2. Also check harness for short to ground and short to power.

OK or NG

1. OK: go to 6.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to COMPONENT INSPECTION  .

OK or NG

1. OK: go to 7.
2. NG: Replace mass air flow sensor.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

1. Inspection end