Scan Tool Data Definitions

Scan Tool Data Definitions

ECT
The scan tool displays -40 to +151°C (-40 to +304°F). The engine coolant temperature (ECT) sensor is mounted in the coolant stream. The powertrain control module (PCM) applies 5 volts to the ECT sensor signal circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold and the internal resistance is high, the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms and the internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.

F C 1, F C 2 Command
The scan tool displays On or Off. This parameter indicates the state of the driver circuit for this device.

Low Coolant Level, Switch Inputs
The scan tool displays YES or NO, determined by the state of the low coolant level switch.