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DTC P0551-A: Power Steering Switch Failure

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, read Diagnostic Trouble Codes (DTCs). If scan tool display GLOBAL GOOD TRIP is equal to zero, go to step  4. If scan tool display GLOBAL GOOD TRIP is not equal to zero, go to next step.
  2. Using scan tool, read FREEZE FRAME data. Ensure hex code matches DTC on scan tool. Hex code should be 73. If DTC matches hex code on scan tool, go to next step. If DTC does not match hex code on scan tool, repair DTC using FREEZE FRAME data. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
  3. Drive vehicle under FREEZE FRAME data conditions. Using scan tool, read DTCs and observe GLOBAL GOOD TRIP counter. If GLOBAL GOOD TRIP counter changed to zero, repeat test procedure. Go to step  1. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If GLOBAL GOOD TRIP counter does not change to zero, DTC is not present at this time. Using scan tool, erase DTC. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
  4. Disconnect power steering pressure switch connector. Connect a jumper wire to power steering pressure switch sense circuit. See POWER STEERING PRESSURE SWITCH CONNECTOR WIRE IDENTIFICATION  table. Using scan tool, monitor power steering pressure switch. While observing scan tool, touch jumper wire to ground 5 times. If power steering pressure switch changed from hi to low, replace power steering pressure switch. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If power steering pressure switch did not change from hi to low, go to next step.
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of power steering pressure switch sense circuit between power steering pressure switch connector and PCM connector terminal No. 45. See POWER STEERING PRESSURE SWITCH CONNECTOR WIRE IDENTIFICATION  table and PCM CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open power steering pressure switch sense circuit. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
  6. Using an ohmmeter, check resistance of power steering pressure switch sense circuit between power steering pressure switch connector and ground. See POWER STEERING PRESSURE SWITCH CONNECTOR WIRE IDENTIFICATION  table. If resistance is less than 5 ohms, repair short to ground on power steering pressure switch sense circuit. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES . If resistance is 5 ohms or more, replace PCM. Perform TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES .
POWER STEERING PRESSURE SWITCH CONNECTOR WIRE IDENTIFICATION

Application Wire Color
Power Steering Pressure
Switch Sense Circuit Dark Blue/Light Green
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 45
Power Steering Pressure Switch Sense Circuit Dark Blue/Light Green
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