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Home >> Mazda >> 2003 >> 6 s, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls [Self-Diagnostics 3.0L] >> Diagnostic Tests >> DTC P0125: Excessive Time To Enter Closed Loop Fuel Control >> Diagnostic Procedure

Diagnostic Procedure

  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. Verify Current Input Signal Status - Is Concern Intermittent Or Constant -  Start engine. Warm up engine completely. Access ECT PID using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If ECT PID reading is not 140°F (60°C) or more, go to next step. If ECT PID reading is 140°F (60°C) or more, problem is intermittent. Refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  4. Inspect ECT Sensor Connector For Poor Connection -  Turn ignition off. Disconnect ECT sensor harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminals. After repair, go to step  7.
  5. Inspect ECT Sensor -  Inspect ECT sensor. Refer to ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If ECT sensor is okay, go to next step. If ECT sensor is faulty, replace ECT sensor. 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 no malfunction is present, 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 P0125 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. Access ECT PID. Wait until ECT PID reading is 68°F (20°C) or less. Start engine and warm up completely. If PENDING CODE for same DTC is not present, go to next step. If PENDING CODE for 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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