Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool Data Definitions (3.6L) - 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.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.