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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> 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 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect PSP Switch Connector For Poor Connection -  Turn ignition off. Disconnect PSP harness connector. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If there are no malfunctions, go to next step. If there are any malfunctions, repair or replace terminal. After repair, go to step  7.
  4. Inspect PSP Switch Signal Circuit For Short To Ground -  Turn ignition off. Check for continuity between PSP switch harness connector terminal "A" (Brown/Green wire) and body ground. See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground between PSP switch harness connector terminal "A" (Brown/Green wire) and PCM 104-pin harness connector terminal No. 14 (Black/Blue wire) or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  7.
    Fig 1: Identifying PSP Switch Circuits & Harness Connector Terminals
    G00221553Courtesy of MAZDA MOTORS CORP.
  5. Inspect PSP Switch -  Inspect PSP switch. Refer to POWER STEERING PRESSURE SWITCH under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If PSP switch is okay, go to next step. If PSP switch is faulty, replace PSP switch. After repair, go to step  7.
  6. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If terminals are okay, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to next step.
  7. Verify Trouble Shooting Of DTC P0550 Is completed -  Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at 37.2 MPH or more for one minute. Verify ECT PID is 140°F (60°C) or more using WDS or equivalent. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  8. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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