Diagnostic Procedure

Which malfunction (A or B) is duplicated?

A or B

A: GO TO  3.

B: GO TO 2.

Check the following for connection.

• Air duct
• Vacuum hoses
• Intake air passage between air duct to intake manifold

OK or NG

OK: GO TO 3.

NG: Reconnect the parts.

1. Turn ignition switch OFF.
2. Loosen and retighten ground three screws on the body.
   Fig 1: Locating Body Ground

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

   Refer to GROUND INSPECTION .

OK or NG

OK: GO TO 4.

NG: Repair or replace ground connections.

1. Disconnect mass air flow (MAF) sensor harness connector.
2. Turn ignition switch ON.
   Fig 2: Locating Mass Air Flow (MAF) Sensor

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check voltage between MAF sensor terminal 2 and ground with CONSULT-II or tester.

   Voltage: Battery voltage 

OK or NG

OK: GO TO  6.

NG: GO TO 5.

Fig 3: Checking Voltage Between MAF Sensor Terminal 2 & Ground

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

Check the following.

• Harness connectors E19, F33
• 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

  : Repair 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.

   Continuity should exist. 

4. Also check harness for short to ground and short to power.

OK or NG

OK: GO TO 7.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.

   Refer to Wiring Diagram.

   Continuity should exist. 

2. Also check harness for short to ground and short to power.

OK or NG

OK: GO TO 8.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

Refer to COMPONENT INSPECTION .

OK or NG

OK: GO TO 9.

NG: Replace mass air flow sensor.

Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

: INSPECTION END