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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0500 To P1424 >> DTC P100A, P100B: VVEL System >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis Procedure

  1. VVEL ACTUATOR MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect VVEL control module harness connector.
    2. Disconnect VVEL actuator motor harness connector.
    3. Check the continuity between VVEL control module harness connector and VVEL actuator motor harness connector.
      DTC No. VVEL control module VVEL actuator motor Continuity
      Bank Connector Terminal Connector terminal
      P100A 1 F56 12 F73 1 Existed
      2 Not existed
      25 1 Not existed
      2 Existed
      P100B 2 2 F71 1 Existed
      2 Not existed
      15 1 Not existed
      2 Existed
    4. Also check harness for short to ground and power.

    Is the inspection result normal? 

    YES: GO TO  3.

    NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between VVEL actuator motor and VVEL control module
    • Loose or poor connection for each connector and harness

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

  3. CHECK VVEL ACTUATOR MOTOR

    Refer to "COMPONENT INSPECTION (VVEL ACTUATOR MOTOR) ".

    Is the inspection result normal? 

    YES: GO TO  5.

    NO: GO TO 4.

  4. REPLACE VVEL ACTUATOR MOTOR ASSEMBLY

    Replace VVEL actuator motor assembly. Refer to "REMOVAL AND INSTALLATION ".

    : INSPECTION END

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Repair or replace.

  6. REPLACE VVEL CONTROL MODULE

    Replace VVEL control module. Refer to "REMOVAL AND INSTALLATION ".

    : GO TO 7.

  7. PERFORM DTC CONFIRMATION PROCEDURE
    1. Turn ignition switch ON.
    2. Erase 1st trip DTC.
    3. Perform DTC Confirmation Procedure.

    See "DTC LOGIC ".

    Is the DTC P100A or P100B displayed again? 

    YES: GO TO 8.

    NO: INSPECTION END

  8. CHECK VVEL ACTUATOR HOUSING ASSEMBLY

    Refer to "COMPONENT INSPECTION (VVEL ACTUATOR HOUSING ASSEMBLY) ".

    Is the inspection result normal? 

    YES: GO TO  10.

    NO: GO TO 9.

  9. REPLACE VVEL ACTUATOR HOUSING ASSEMBLY

    Replace VVEL actuator housing assembly. Refer to "REMOVAL AND INSTALLATION ".

    : INSPECTION END

  10. CHECK VVEL LADDER ASSEMBLY

    Refer to "INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO  12.

    NO: GO TO 11.

  11. REPLACE CYLINDER HEAD AND VVEL LADDER ASSEMBLY

    Replace cylinder head and VVEL ladder assembly.

    Refer to "REMOVAL AND INSTALLATION " (Cylinder head).

    Refer to "REMOVAL AND INSTALLATION " (VVEL ladder assembly)

    : INSPECTION END

  12. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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