The engine coolant temperature (ECT) sensor is a variable resistor that measures the
temperature of the engine coolant. The powertrain control module (PCM) supplies 5 volts to the
signal circuit. When coolant temperatures are low, resistance is high. When coolant
temperatures are high the resistance is low.

The PCM uses this input for engine controls and enabling criteria for diagnostics. The PCM will
record the amount of time the engine is OFF. At restart the PCM will compare the temperature
difference between the ECT and intake air temperature (IAT). If the temperature difference is not
within the calculated amount, after the predetermined soak time, this DTC will set.
More Auto Repair Answers, Questions And Help
             World Of Wheels                     Electrical Testing                    Belt Diagrams              Mustang Engine Overhaul              All about Tires
World of wheels car show pictures        Vehicle electrical testing        Serpentine belt diagrams        Ford Mustang 5.0 engine overhaul high performance        Tire number descriptions

© Copyright 2006 . JRKAZ,Inc.
Contact Us
Terms And Privacy Policy

Coolant Temp Sensor Operation And Description