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Home >> Dodge and Ram >> 2002 >> Durango R/T, 4.7 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - NGC >> Diagnostic Tests >> DTC P0551: Power Steering Switch Performance >> Testing

DTC P0551: Power Steering Switch Performance: Testing

  1. Turn the ignition on, with the engine off. With the DRBIII(R), 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 FAILURES  under ON-BOARD DIAGNOSTICS.
  2. Turn the ignition off. Disconnect the P/S Switch harness connector. Measure the resistance between ground and the Ground circuit in the P/S Switch harness connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open in the Ground circuit.
  3. Disconnect the PCM harness connectors. Measure the resistance between ground and the P/S Switch Signal circuit in the P/S Switch harness connector. Is the resistance less than 100 ohms? If yes, repair the short to ground in the P/S Switch Signal circuit. If no, go to next step.
    4. 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 the resistance of the P/S Switch Signal circuit from the P/S Switch harness connector to the appropriate terminal in the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the P/S Switch Signal circuit.
  5. Reconnect the PCM harness connectors. Turn the ignition on, with the engine off. Connect a jumper wire to the P/S Switch Signal circuit in the P/S Switch harness connector. Using the DRBIII(R), monitor the P/S Switch. Touch the jumper wire to the Ground circuit in the P/S Switch harness connector several times. Did the P/S Switch status change from High to Low? If yes, replace the P/S Switch. If no, go to next step.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  6. There are no possible causes remaining, replace the PCM.
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