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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 >> P0551-Power Steering Switch Performance (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.

    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 (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .

  2. Turn the ignition off.

    Disconnect the Power Steering Pressure Switch harness connector.

    Ignition on, engine not running.

    Connect a jumper wire to the (K66) P/S Switch Signal circuit at harness connector.

    Using the DRBIII®, while monitoring the Power Steering Pressure Switch.

    Touch the other end of the jumper wire to the (Z988) Ground circuit at the Power Steering Pressure Switch harness connector several times.

    Did the Power Steering Pressure Switch status change from High to Low?

    1. Yes --> Replace the Power Steering Pressure Switch.

      Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .

    2. No --> Go To 3
    NOTE: Remove the jumper wire before continuing.
  3. Turn the ignition off.

    Disconnect the PCM harness connectors.

    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.
  4. Measure resistance of (K66) P/S Switch Signal circuit from the Power Steering Pressure Switch 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 (K66) P/S Switch Signal circuit.

      Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .

  5. Measure the resistance between ground and the (K66) P/S Switch Signal circuit at the Switch connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K66) P/S Switch Signal circuit.

      Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .

    2. No --> Go To 5
  6. Measure the resistance between Ground and the (Z988) Ground circuit at the Power Steering Pressure Switch connector.

    Is the resistance below 100 ohms?

    1. Yes --> Go To 6
    2. No --> Repair the open in the (Z988) Ground circuit.

      Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .

    7. 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 (NGC) POWERTRAIN VERIFICATION TEST VER - 2 .
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