DTC 14, ECT Sensor - High Temperature Indicated (With A/T): Notes

The Engine Coolant Temperature (ECT) sensor uses a thermistor to control signal voltage from ECM. The ECM applies and monitors voltage over circuit No. 410 to sensor. When engine is cold, sensor resistance is high, the ECM will sense a high signal voltage. As engine warms, sensor resistance becomes less and voltage drops. At normal engine operating temperature, voltage will be 1.5-2.0 volts. When DTC 14 sets, early application of torque converter clutch will occur.

1. DTC 14 will set if signal voltage indicates a coolant temperature greater than 293°F (145°C) for 0.5 second.
2. This test determines if circuit No. 410 is shorted to ground, causing conditions for DTC 14 to set.