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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0551: Power Steering Switch Performance >> Testing

DTC P0551: Power Steering Switch Performance: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read DTCs and record the related freeze frame data. Is the Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the power steering pressure switch harness connector. Ignition on, engine not running. Connect a jumper wire to the (K10) P/S switch signal circuit at power steering pressure switch harness connector. Using the DRBIII® scan tool, monitor the power steering pressure switch. Touch the jumper wire to the (Z1) ground circuit at the power steering pressure switch harness connector several times. Did the power steering pressure switch status change from HI to LOW? If yes, replace the power steering pressure switch. If no, go to next step.
    NOTE: Remove the jumper wire before continuing.
    3. 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.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Measure resistance of power steering (K10) PSP switch signal circuit from the power steering pressure sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K10) PSP switch signal circuit.
  4. Measure the resistance between ground and the (K10) P/S switch signal circuit at the P/S switch connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K10) P/S switch signal circuit. If no, go to next step.
  5. Measure the resistance between ground and the (Z1) ground circuit at the power steering pressure switch connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (Z1) ground circuit.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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