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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 P2088: Right Oil Control Valve Actuator Circuit - Low Input >> 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 Right OCV Connector For Poor Connection -  Turn ignition off. Disconnect right OCV harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to step  9.
  4. Inspect Right OCV Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between right 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 between main relay harness connector terminal "C" (White wire) and right OCV harness connector terminal "B" (Green/Blue wire) or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  9.
    Fig 1: Identifying Right Oil Control Valve Circuits & Harness Connector Terminals
    G00256837Courtesy of MAZDA MOTORS CORP.
  5. Inspect Right OCV Control Circuit For Short To Ground -  Turn ignition off. Disconnect right OCV harness connector. Check for continuity between right OCV harness connector terminal "A" (Brown wire) and body ground. If continuity is not present, go to next step. If continuity is present, repair short circuit in suspected wire between right OCV harness connector terminal "A" (Brown wire) and PCM 104-pin harness connector terminal No. 81 (Blue/Yellow wire) or replace wire harness. After repair, go to step  9.
  6. Inspect Right 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 right OCV is okay, go to next step. If right OCV is faulty, replace right OCV. After repair, go to step  9.
  7. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If malfunction is not present, go to next step. If malfunction is present, repair terminal or replace wire harness. After repair, go to step  9.
  8. Inspect Right OCV Control Circuit For Open Circuit -  Disconnect right OCV harness connector. Check for continuity between right OCV harness connector terminal "A" (Brown wire) and PCM 104-pin harness connector terminal No. 81 (Blue/Yellow wire). See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in suspected wire between right OCV harness connector terminal "A" (Brown wire) and PCM 104-pin harness connector terminal No. 81 (Blue/Yellow wire) or replace wire harness. 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. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and warm up completely. If same DTC is not present, go to next step. If 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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