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DTC P0125: Excessive Time To Enter Closed Loop

  1. Connect scan tool to Data Link Connector (DLC). Select COOLANT TEMP parameter. Start engine and warm up to operating temperature. If temperature displayed on scan tool is less than 88°F (31°C), go to next step. If temperature is not as specified, go to step  4 .
  2. Turn ignition off. Use a fused jumper wire to connect ECT sensor harness connector terminal No. 1 (Orange/Black wire) to terminal No. 3 (Blue wire). Turn ignition on and note temperature displayed on scan tool. If temperature displayed is 327°F (164°C), go to next step. If temperature is not as specified, check Orange/Black and Blue wires for open or short circuit between ECT sensor and PCM. If wiring is okay, replace PCM and retest system.
  3. Test ECT sensor resistance. See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If ECT sensor resistance is okay, go to next step. If resistance is not as specified, replace ECT sensor and retest system.
  4. Inspect thermostat for proper operation. Replace thermostat if necessary. If thermostat is okay, replace PCM and retest system.
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