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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> 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, corrosion). If there are no malfunctions, go to next step. If there are any malfunctions, repair or replace terminal. After repair, go to step  8.
  4. Inspect PSP Switch -  Perform PSP switch inspection. 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  8.
  5. Inspect PSP Switch Signal Circuit For Short To Ground -  Disconnect PCM connectors. Check for continuity between PSP switch harness connector terminal (Black/Blue wire) and body ground. See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short circuit in Black/Blue wire between PSP switch harness connector terminal and PCM 30-pin harness connector terminal "1Z". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  8.
    Fig 1: Identifying Power Steering Pressure Switch Circuit & Harness Connector Terminals
    G00221514Courtesy of MAZDA MOTORS CORP.
  6. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If connections are okay, go to next step. If any malfunctions are present, repair or replace faulty terminal. After repair, go to step  8.
  7. Inspect Signal Circuit Malfunction For Open Circuit -  Check for continuity in Black/Blue wire between PSP harness connector terminal "A" and PCM 30-pin harness connector terminal "1Z". If continuity is present, go to next step. If continuity is not present, repair open circuit in Black/Blue wire between PSP switch harness connector terminal and PCM 30-pin harness connector terminal "1Z". After repair, go to step  8.
  8. 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 more than 37.3 MPH for 1 minute. Verify ECT PID is more than 140°F (60°C) 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.
  9. 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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