LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2013 >> FX37 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Control System - DTC Index (Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection M95. Refer to "Ground Inspection" in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

  2. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      ECM Ground Continuity
      Connector Terminal
      F110 6 Ground Existed
      F111 54
      M160 123
      128
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F103, M116
    • Harness for open or short between ECM and ground

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

  4. CHECK ECM POWER SUPPLY CIRCUIT-I 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECM harness connector terminals.
      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      M160 106 M160 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F10
    • Harness connectors F103, M116
    • IPDM E/R harness connector E7
    • 10 A fuse (No. 44)
    • Harness for open or short between ECM and fuse

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

  6. CHECK ECM POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals as per the following.
      ECM Voltage
      Connector + -
      Terminal Terminal
      M160 121 128 After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: GO TO  9.

  7. CHECK ECM POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch ON.
    2. Check the voltage between IPDM E/R harness connector and ground.
      IPDM E/R Ground Voltage
      Connector Terminal
      E7 49 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

  9. CHECK ECM POWER SUPPLY CIRCUIT-IV 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals as per the following.
      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F110 15 M160 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 10.

  10. CHECK ECM POWER SUPPLY CIRCUIT-V 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F110 15 E7 69 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E10, F10
    • Harness for open or short between ECM and IPDM E/R

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

  12. CHECK 15 A FUSE 
    1. Disconnect 15 A fuse (No. 50) from IPDM E/R.
    2. Check 15 A fuse.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: Replace 15 A fuse.

  13. CHECK ECM POWER SUPPLY CIRCUIT-VI 
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      M160 121 E5 10 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: GO TO 14.

  14. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E106, M6
    • Harness for open or short between ECM and IPDM E/R

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

  15. CHECK INTERMITTENT INCIDENT 

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

scientia non olet · About LEMON Manuals