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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 OCV Connector For Poor Connection -  Disconnect OCV harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  9.
  4. Inspect OCV -  Perform OCV Inspection. Refer to OIL CONTROL VALVE - MAZDA6 & MIATA ONLY under VARIABLE VALVE TIMING in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If OCV is okay, go to next step. If OCV is faulty, replace OCV. After repair, go to step  9.
  5. Inspect OCV Power Supply Circuit For Open Circuit -  Disconnect OCV harness connector. Turn ignition on, engine off. Measure voltage between OCV harness connector terminal "B" (White wire) and body ground. See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White wire between OCV harness connector terminal "B" and main relay. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
    Fig 1: Identifying Oil Control Valve Circuits & Harness Connector Terminals
    G00221522Courtesy of MAZDA MOTORS CORP.
  6. Inspect PCM Connector For Poor Connection -  Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion) at PCM 30-pin harness connector terminal "4M" (Brown/Yellow wire). If malfunction is not present, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  9.
  7. Inspect OCV Control Circuit For Short To Ground -  Check for continuity between OCV harness connector terminal "A" (Brown/Yellow wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". After repair, go to step  9.
  8. Inspect OCV Control Circuit For Open Circuit -  Connect OCV harness connector. Turn ignition on, engine off. Check for continuity in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". See Fig 1. If continuity is not present, go to next step. If continuity is present, repair open circuit in Brown/Yellow wire between OCV harness connector terminal "A" and PCM 30-pin harness connector terminal "4M". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  9. Verify Trouble Shooting Of DTC P2088 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm up completely. 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.
  10. 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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