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Home >> Infiniti >> 2014 >> Q60 Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System - DTC/Circuit Diagnosis (Convertible) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit (VVEL Control Module) >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connections M95, E46. 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 VVEL control module harness connector.
    2. Check the continuity between VVEL control module harness connector and ground.
      VVEL control module Ground Continuity
      Connector Terminal
      E15 14 Ground Existed
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 3.

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

  3. CHECK VVEL CONTROL MODULE POWER SUPPLY CIRCUIT-I 
    1. Reconnect VVEL control module harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between VVEL control module harness connector.
      VVEL control module Voltage
      Connector + -
      Terminal Terminal
      E15 8 14 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 4.

      NO: GO TO  5.

  4. 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.

  5. CHECK VVEL CONTROL MODULE POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connector terminals.
      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F101 24 M107 128 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 6.

  6. CHECK VVEL CONTROL MODULE POWER SUPPLY CIRCUIT-III 
    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
      F101 24 E7 69 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness or connectors E3, F1
    • Harness or connectors F104, F105
    • 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.

  8. 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 9.

      NO: Replace 15A fuse.

  9. CHECK VVEL CONTROL MODULE POWER SUPPLY CIRCUIT-IV 
    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
      M107 125 E7 49 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. 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.

  11. 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.

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