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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0550: Power Steering Pressure Switch Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  4.
  2. Inspect PSP Switch -  Turn ignition off. Disconnect PSP switch connector. Connect ohmmeter between ground and PSP switch connector terminal. Start engine and operate at idle. Turn steering wheel from side to side and observe ohmmeter. Continuity should be present when steering wheel is fully turned. Continuity should not be present when steering wheel is straight ahead. If continuity is present, go to next step. If continuity is not present, replace PSP switch. After repair, go to step  4.
  3. Inspect PSP Switch Signal Circuit For Short To Ground -  Turn ignition off. Disconnect PCM 104-pin harness connector and PSP switch single pin harness connector. Check for continuity between ground and PSP harness connector terminal (Black/White wire). If continuity is not present, go to next step. If continuity is present, repair short to ground in Black/White wire between PSP switch harness connector terminal and PCM 104-pin harness connector terminal No. 31. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to next step.
  4. Verify Trouble Shooting Of DTC P0550 Completed -  Reconnect all connectors. Start engine. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Ensure ECT PID is more than 140°F (60°C). Drive vehicle at more than 37.4 MPH for one minute. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0550 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0550 is not present, go to next step.
  5. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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