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DTC P0551: Power Steering Switch Failure: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  7.
  2. Turn the ignition off. Disconnect the Power Steering Pressure Switch harness connector. Power Steering Pressure Switch is located in high pressure power steering hose, underneath Power Steering Pump. Using a 12-volt test light connected to 12 volts, probe the ground circuit in the Power Steering Pressure Switch harness connector. Does the test light illuminate? If yes, go to next step. If no, repair the Power Steering Pressure Switch ground circuit for an open.
  3. Ensure the ignition is off. Disconnect the PCM harness connectors. Measure the resistance between ground and the Power Steering Pressure Switch Sense circuit at the Power Steering Pressure Switch harness connector. Is the resistance below 100 ohms? If yes, repair the Power Steering Pressure Switch Sense circuit for a short to ground. If no, go to next step.
  4. Measure resistance of Power Steering Pressure Switch Sensor circuit from PCM harness connector to Power Steering Pressure Sensor harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open Power Steering Switch Sense circuit.
  5. Turn ignition off. Reconnect PCM connectors. Turn ignition on, engine not running. Connect one end of a jumper wire to the Power Steering Pressure Switch Sense circuit at the Power Steering Pressure Switch harness connector. Using the DRBIII®, monitor the Power Steering Pressure Switch. Touch the other end of jumper wire to the 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.
  6. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    7. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  7. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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