Diagnostic Procedure

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

   Refer to "GROUND INSPECTION ".

   Fig 1: Identifying Body Ground M70 And Body Ground M16 Screws

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

OK or NG 

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect fuel pump control module (FPCM) harness connector.
   Fig 2: Identifying Fuel Pump Control Module (FPCM) Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON.
3. Check voltage between FPCM terminal 2 and ground with CONSULT-III or tester.

   Voltage: Battery voltage 

OK or NG 

OK: GO TO  4.

NG: GO TO 3.

Fig 3: Checking Voltage Between FPCM Terminal 2 And Ground

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

Check the following.

• Harness connectors E106, B4
• Harness for open or short between FPCM and harness connector B4

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

1. Turn ignition switch OFF.
2. Check harness continuity between FPCM terminal 3 and ground.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. Also check harness for short to power.

OK or NG 

OK: GO TO 5.

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

1. Disconnect "fuel level sensor unit and fuel pump" harness connector (1).
   • Illustration shows the view with rear seat cushion and inspection hole cover (RH) removed.
   • <=: Vehicle front
     Fig 4: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector

     Courtesy of NISSAN MOTOR CO., U.S.A.
2. Disconnect dropping resistor harness connector.
   Fig 5: Identifying Fuel Pump Control Module (FPCM) Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check harness continuity between the following;

   "fuel level sensor unit and fuel pump" terminal 3 and dropping resistor terminal 2,

   FPCM terminal 4 and dropping resister terminal 2.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Check harness continuity between the following;

   "fuel level sensor and fuel pump" terminal 3 and ground,

   FPCM terminal 4 and ground.

   Refer to WIRING DIAGRAM .

   Continuity should not exist. 

5. Also check harness for short to power.

OK or NG 

OK: GO TO  7.

NG: GO TO 6.

Check the following.

• Harness connectors B434, B65
• Harness for open or short between "fuel level sensor unit and fuel pump" and dropping resistor
• Harness for open or short between FPCM and dropping resistor
• Harness for open or short between "fuel level sensor unit and fuel pump" and ground
• Harness for open or short between FPCM and ground

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

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 38 and FPCM terminal 4.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

3. Check harness continuity between ECM terminal 38 and ground.

   Refer to WIRING DIAGRAM .

   Continuity should not exist. 

4. Also check harness for short to power.

OK or NG 

OK: GO TO  9.

NG: GO TO 8.

Check the following.

• Harness connectors B2, M13
• Harness connectors M72, F102
• Harness for open or short between ECM and FPCM

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

1. Check harness continuity between ECM terminal 39 and FPCM terminal 1.

   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  11.

NG: GO TO 10.

Check the following.

• Harness connectors B2, M13
• Harness connectors M72, F102
• Harness for open or short between ECM and FPCM

  >> 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 12.

NG: Replace FPCM.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

>> INSPECTION END