GM Service Manual Online
For 1990-2009 cars only

ECM Scan Tool Data List

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Engine Idling, A/C ON, Ambient Air Temperature Between 22-27°C (70-80°F)

FC Relay 1 Command

Cooling/HVAC

On/Off

Varies

FC Relay 2 and 3 Command

Cooling/HVAC

On/Off

Varies

FC Relay 1 Circuit Status

Cooling/HVAC

OK/Open/Short/Invalid State

Varies

FC Relay 2 and 3 Circuit Status

Cooling/HVAC

OK/Open/Short/Invalid State

Varies

ECT Sensor

Cooling/HVAC

°C/°F

Varies