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DTC P0551: Power Steering Switch Failure: Testing

  1. Turn the ignition off. Disconnect the Power Steering Pressure Switch harness connector. Turn the ignition on. With the DRBIII®, monitor the Power Steering Pressure Switch. Using a jumper wire, connect one end to the Power Steering Pressure Switch Sense circuit. With the other end of the jumper tap the ground circuit in the Power Steering Pressure Switch harness connector. Does the Power Steering Pressure Switch display change from HI to LOW? If yes, replace the Power Steering Pressure Switch. If no, go to next step.
  2. Turn the ignition off. 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 ground circuit for an open.
  3. Ensure the ignition is off. Disconnect the PCM C2 harness connector. Measure the resistance of the Power Steering Pressure Switch Sense circuit in the PSP Switch harness connector to ground. Is the resistance below 100 ohms? If yes, repair the Power Steering Pressure Sense circuit for a short to ground. If no, go to next step.
  4. Measure the resistance of the Power Steering Pressure Switch Sense circuit between the PSP Switch harness connector and the PCM C2 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Power Steering Pressure Sense circuit for an open.
  5. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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