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DTC P0551: Power Steering Switch Failure: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP is displayed and equal to zero, go to next step. If GOOD TRIP is not displayed and equal to zero, go to step  7 .
  2. Turn ignition off. Disconnect power steering pressure switch harness connector. See Figure . Measure resistance between ground and power steering pressure switch ground circuit (Black wire) at power steering pressure switch harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit.
  3. Turn ignition on. Connect one end of a jumper wire to sense circuit (Dark Blue/Orange wire) at power steering pressure switch harness connector. Using scan tool, monitor POWER STEERING PRESSURE SWITCH state. Touch other end of jumper wire to ground circuit (Black wire) at power steering pressure switch harness connector several times. If POWER STEERING PRESSURE SWITCH state does not change from HI to LOW, go to next step. If POWER STEERING PRESSURE SWITCH state changes from HI to LOW, replace power steering pressure switch.
  4. Turn ignition off. Disconnect PCM harness connector. See Figure . Measure resistance between ground and sense circuit (Dark Blue/Orange wire) at power steering pressure switch harness connector. If resistance is more than 100 k/ohms, go to next step. If resistance is 100 k/ohms or less, repair short to ground in sense circuit.
  5. Measure resistance of sense circuit (Dark Blue/Orange wire) between power steering pressure switch harness connector and terminal No. 45 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in sense circuit.
  6. If no other possible causes are remaining, replace PCM.
  7. Turn ignition off. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins (TSBs) that may apply. If a problem is found, repair as necessary. If no problems are found, test is complete.
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