LEMON Manuals: Even more car manuals for everyone
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 >> P0501-Vehicle Speed Signal No. 1 Performance; P0503-Vehicle Speed Signal No. 1 Erratic; (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. Ignition on, engine not running.
    NOTE: Check the ABS Module for active DTCs. Any VSS DTCs in the ABS Module must be properly diagnosed before continuing.

    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 CAB Module harness connector.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage of the (B22) Vehicle Speed No. 1 Signal circuit at the CAB Module harness connector.

    Is the voltage above 6.0 volts?

    1. Yes --> Repair the short to voltage in the (B22) Vehicle Speed No. 1 Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 3
  3. 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 (B22) Vehicle Speed No. 1 Signal circuit from the CAB Module harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 4
    2. No --> Repair the open in the (B22) Vehicle Speed No. 1 Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  4. Measure the resistance between ground and the (B22) Vehicle Speed No. 1 Signal circuit in the CAB Module harness connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (B22) Vehicle Speed No. 1 Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 5
    5. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  5. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there is 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 .
scientia non olet · About LEMON Manuals