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Home >> Nissan-Datsun >> 2011 >> 370Z Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 370Z - Diagnostics Introduction & DTC Index >> 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 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 VVEL CONTROL MODULE 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.
      CONNECTOR TERMINALS REFERENCE

      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, 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 and ground.
    VOLTAGE SPECIFICATION

    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  5.

    NO: Go to 4.

  4. CHECK VVEL CONTROL MODULE POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Disconnect VVEL control module harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between VVEL control module harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      VVEL control module IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E15 8 E7 49 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: "DIAGNOSIS PROCEDURE "

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

  5. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

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

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