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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Powertrain Diagnostic Procedures - DRIVEABILITY - NGC Symptoms & Diagnostic Tests (DTCS P0016 To P0563)) >> DRIVEABILITY - NGC - Diagnostic Tests >> P0499-NVLD Canister Vent Valve Solenoid Circuit High (Gas - NGC) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
  1. Check for any related TSBs before continuing.

    Ignition on, engine not running.

    With the DRBIII®, read DTCs and record the related Freeze Frame data.

    Is the Good Trip Counter displayed and equal to zero?

    1. Yes --> Go To 2
    2. No --> Refer to the SYMPTOM: INTERMITTENT CONDITION  Symptom (Diagnostic Procedure).

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  2. Turn the ignition off.

    Disconnect the NVLD Assembly harness connector.

    Measure the resistance of the NVLD Solenoid coil.

    Is the resistance between 7.5 to 8.5 ohms?

    1. Yes --> Go To 3
    2. No --> Replace the NVLD Assembly.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  3. Disconnect the PCM harness connectors.

    Take this measurement with the Ignition in the off (lock) position and in the Ignition on, engine off position.

    Measure the voltage on the (K106) NVLD Sol Control circuit in the NVLD Assembly harness connector.

    Is the voltage above 1.0 volt?

    1. Yes --> Repair the short to voltage in the (K106) NVLD Sol Control circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 4
  4. Turn the ignition off.
    CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

    Measure the resistance of the (K106) NVLD Sol Control circuit from the NVLD Assembly harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 5
    2. No --> Repair the open in the (K106) NVLD Sol Control circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  5. Measure the resistance between the (Z910) Ground circuit and ground.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 6
    2. No --> Repair the open in the (Z910) Ground circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there are no possible causes remaining, view repair.

    1. Repair
      1. Replace and program the Powertrain Control Module per Service Information.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .