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Home >> Mazda >> 2000 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Excessive Time To Enter Closed Loop >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Warm engine to operating temperature. Using scan tool, check ECT PID. If ECT is less than 140°F (60°C), go to next step. If ECT is 140°F (60°C) or more, problem is intermittent (not current).
  3. Inspect ECT sensor terminals. If terminals are okay, go to next step. If terminals are not okay, repair or replace as needed. Go to step  6.
  4. Check resistance between ECT sensor terminals. If resistance is about 2000 ohms, go to next step. If resistance is not about 2000 ohms, replace SET sensor and go to step  6.
  5. Disconnect PCM connectors. Check connectors and terminals. If no problem is found, go to next step. If any problem is found, repair as needed and go to next step.
  6. Connect all connectors. Turn ignition on. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Using scan tool, check ECT PID. Ensure ECT PID is less than 68°F (20°C). Start engine. Warm engine to operating temperature. Using scan tool, check for pending DTC P0125. If DTC is not pending, go to next step. If DTC is pending, replace PCM and go to next step.
  7. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any DTC is present, diagnose and repair as necessary. If no DTC is present, test is complete.
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