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Home >> Nissan-Datsun >> 2005 >> Pathfinder LE, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> Fuel Pump Circuit >> Diagnostic Procedure
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Diagnostic Procedure

  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
      G02432505Courtesy 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 
      Fig 2: Checking Voltage Between ECM Connector Terminal 113 And Ground
      G02432506Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO  5.
    • NG: GO TO 3.
  3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II 

    Check voltage between IPDM E/R terminal 46 and ground with CONSULT-II or tester.

    • Voltage: Battery voltage 
    Fig 3: Checking Voltage Between IPDM E/R Connector Terminal 46 And Ground
    G02432507Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 4.
    • NG: GO TO 10.
  4. DETECT MALFUNCTIONING PART 

    Check harness for open or short between IPDM E/R and ECM

    • Repair harness or connectors.
  5. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect IPDM E/R harness connector E122.
    4. Turn ignition switch ON.
    5. Check voltage between IPDM E/R terminal 13 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON. 
      Fig 4: Checking Voltage Between IPDM E/R Connector Terminal 13 And Ground
      G02432508Courtesy of NISSAN MOTOR CO., U.S.A.
    6. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  7.
    • NG: GO TO 6.
  6. CHECK 15A FUSE 
    1. Turn ignition switch OFF.
    2. Disconnect 15A fuse.
    3. Check 15A fuse.

    OK or NG 

    • OK: GO TO 10.
    • NG: Replace fuse.
  7. CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect "fuel level sensor unit and fuel pump" harness connector.
      Fig 5: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connectors
      G02432509Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 1 and harness IPDM E/R terminal 13, "fuel level sensor unit and fuel pump" terminal 3 and ground.

      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  9.
    • NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors C1, E41
    • Harness for open or short between "fuel level sensor unit and fuel pump" and IPDM E/R
    • 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.
  9. CHECK FUEL PUMP 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    • OK: GO TO 10.
    • NG: Replace fuel pump.
  10. 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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