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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1430 (Engine Control System) >> Fuel Pump Circuit >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OVERALL FUNCTION 
    1. Turn ignition switch ON.
    2. Pinch fuel feed hose with two fingers.
      • Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON. 
      Fig 1: Pinching Fuel Feed Hose With Two Fingers
      G02402192Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO 2.
  2. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Turn ignition switch ON.
    4. Check voltage between ECM terminal 113 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  4.
    • NG: GO TO 3.
    Fig 2: ECM Connector Terminal 113 & Ground
    G02402193Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I 

    Check voltage between IPDM E/R terminal 40 and ground with CONSULT-II or tester.

    • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO 4.
    • NG: GO TO  15.
    Fig 3: IPDM E/R Terminal 40 & Ground Voltage Test
    G02402194Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness connectors M72, F102
    • Harness for open or short between IPDM E/R and ECM
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK CONDENSER POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect condenser harness connector.
    4. Turn ignition switch ON.
    5. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON. 
    6. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  9.
    • NG: GO TO 6.
    Fig 4: Condenser Terminal 1 & Ground Voltage Test
    G02402195Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK 15A FUSE 
    1. Turn ignition switch OFF.
    2. Disconnect 15A fuse.
    3. Check 15A fuse.

    OK or NG

    • OK: GO TO 7.
    • NG: Replace fuse.
  7. CHECK CONDENSER POWER SUPPLY CIRCUIT-II 
    1. Disconnect IPDM E/R harness connector E8.
    2. Check harness continuity between IPDM E/R terminal 39 and condenser terminal 1. Refer to WIRING DIAGRAM .
      • Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  15.
    • NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E107, B3
    • Harness for open or short between IPDM E/R and condenser
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK CONDENSER GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between condenser terminal 2 and ground. Refer to WIRING DIAGRAM .
      • Continuity should exist. 
    3. Also check harness for short to power.

    OK or NG

    • OK: GO TO  11.
    • NG: GO TO 10
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B43, T1 (Coupe models)
    • Harness connectors B39, D102 (Coupe models)
    • Harness connectors B61, T23 (Roadster models)
    • Harness for open or short between condenser and ground
      • : Repair open circuit or short to power in harness or connectors.
  11. CHECK CONDENSER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 12.
    • NG: Replace condenser.
  12. CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    2. Disconnect harness connectors E107, B3.
    3. Check harness continuity between the following;

      "fuel level sensor unit and fuel pump" terminal 1 and harness connector B3 terminal 4,

      "fuel level sensor unit and fuel pump" terminal 3 and ground. Refer to WIRING DIAGRAM .

      • Continuity should exist. 
      Fig 5: Fuel Level Sensor Unit
      G02402196Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  14.
    • NG: GO TO 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connector B3
    • Harness connectors B43, T1 (Coupe models)
    • Harness connectors B39, D102 (Coupe models)
    • Harness connectors B61, T23 (Roadster models)
    • Harness for open or short between "fuel level sensor unit and fuel pump" and harness connector B3
    • Harness for open or short between "fuel level sensor unit and fuel pump" and ground
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  14. CHECK FUEL PUMP 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 15.
    • NG: Replace fuel pump.
  15. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG

    • OK: Replace IPDM E/R.
    • NG: Repair or replace harness or connectors.
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