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Home >> Infiniti >> 2010 >> M45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Fuel Pump >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK OVERALL FUNCTION
    1. Turn ignition switch ON.
    2. Pinch fuel feed hose (1) with two fingers.

    Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON  .

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

    Fig 1: Locating Fuel Feed Hose
    G05211127Courtesy of NISSAN MOTOR CO., U.S.A.
  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-III or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  5.

    NG: GO TO 3.

    Fig 2: Checking Voltage Between ECM Terminal 113 And Ground
    G04900786Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

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

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO 4.

    NG: GO TO  11.

    Fig 3: Checking Voltage Between IPDM E/R Terminal 40 And Ground
    G04915864Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E108, M15
    • 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 FUEL PUMP POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. 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
    4. Turn ignition switch ON.
    5. Check voltage between "fuel level sensor unit and fuel pump" terminal 1 and ground with CONSULT-III or tester.

    Voltage: Battery voltage should exist for 1 second after ignition switch is turned ON  .

    Fig 4: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
    G05209765Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 7.

    NG: GO TO  6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, B4
    • Harness connectors B65, B434
    • IPDM E/R connector E8
    • 15 A fuse
    • 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.

  7. CHECK FUEL PUMP GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect dropping resistor harness connector.
      Fig 5: Disconnecting Dropping Resistor Harness Connector
      G06303495Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check harness continuity between "fuel level sensor unit and fuel pump" terminal 3 and dropping resistor terminal 2, dropping resistor terminal 1 and ground.

      Refer to SYSTEM WIRING DIAGRAMS article.

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

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

  9. CHECK DROPPING RESISTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace dropping resistor.

  10. CHECK FUEL PUMP

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 11.

    NG: Replace fuel pump.

  11. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    OK or NG 

    OK: Replace IPDM E/R.

    NG: Repair or replace harness or connectors.



  1. CHECK OVERALL FUNCTION-I

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
    3. Check "BRAKE SW1" indication under the following conditions.
    INDICATION CONDITION CHART

    CONDITION INDICATION
    Brake pedal: Fully released ON
    Brake pedal: Slightly depressed OFF

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    VOLTAGE CONNECTOR TERMINALS REFERENCE CHART

    CONDITION VOLTAGE
    Brake pedal: Fully released Battery voltage
    Brake pedal: Slightly depressed Approximately 0 V

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G04900670Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ICC brake switch (2) harness connector.
      • Stop lamp switch (1)
    3. Turn ignition switch ON.
      Fig 2: Identifying ICC Brake Switch And Stop Lamp Switch
      G05210064Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ICC brake switch terminal 1 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 ICC Brake Switch Terminal 1 And Ground
    G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E102
    • 10 A fuse
    • Harness for open or short between ICC brake switch and fuse

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

  4. CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ICC brake switch terminal 2 and ECM terminal 108.

      Refer to SYSTEM WIRING DIAGRAMS article.

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO  6.

    NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ICC brake switch and ECM

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

  6. CHECK ICC BRAKE SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 7.

    NG: Replace ICC brake switch.

  7. CHECK INTERMITTENT INCIDENT

    Refer to "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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