DTC P0125: Excessive Time To Enter Closed Loop

Disconnect negative battery cable. Drain cooling system. Disconnect ECT sensor harness connector and remove sensor from engine. Using DVOM, measure resistance of ECT sensor while immersed in container of water. Heat or cool water and compare with specified values. See ECT SENSOR RESISTANCE  table. Replace ECT sensor if resistance is not as specified. If ECT sensor is okay check thermostat for proper operation. Replace thermostat if necessary. If thermostat is okay, replace PCM and retest system.