Scan Tool Data Definitions

Scan Tool Data Definitions - Engine Cooling

The Scan Tool Data Definitions list contains a brief description of all of the cooling system related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists. In some cases the parameter may appear more than once, or in more than one data list in order to group certain related parameters together.

Calculated ECT - Thermostat Diagnosis
This parameter displays the modeled temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined amount of time, a DTC will set.

ECT Sensor
This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor.

FC Relay 1 Circuit Status
This parameter displays the state of the fan relay control circuit. The parameter displays Indeterminate when no circuit fault is detected when the fans are OFF. The parameter displays OK when no circuit fault is detected when the fans are ON.

FC Relay 1 Command
This parameter displays the control module commanded state of the fan relay control circuit.

FC Relay 2 and 3 Circuit Status
This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open, shorted to ground, or shorted to voltage. The parameter displays Indeterminate when no circuit fault is detected when the fans are OFF. The parameter displays OK when no circuit fault is detected when the fans are ON.

FC Relay 2 and 3 Command
This parameter displays the control module commanded state of the fan relay control circuit.