Scan Tool Data Definitions

WARNING: This page is about a different car, the 2006 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

ECT Sensor 1:: 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.
Fan Control 1 Command:: This parameter indicates that the PCM is turning ON the fan 1 relay. When the fan 1 relay is ON, both engine cooling fans operate at LOW speed. The PCM will command the fan 1 relay on when AC is selected. The PCM will command the fan 1 relay on when the coolant temperature reaches 98°C (208°F). Once energized the fan 1 relay remains ON until the coolant temperature drops to below 95°C (203°F) or AC is switched Off.
Fan Control 2 Command:: This parameter indicates that the PCM is turning ON the fan 2 relay. When the fan 2 relay is ON, both engine cooling fans operate at HIGH speed.The PCM will command the fan 2 relay on when AC system pressure is more than 2, 100 kPa. The PCM will command the fan 2 relay on when the coolant temperature reaches 102°C (215°F). Once energized the fan 2 relay remains ON until the coolant temperature drops to below 99°C (210°F) or the AC pressure is below 1, 400 kPa.
Low Coolant Level, Switch Inputs: The scan tool displays YES or NO, determined by the state of the low coolant level switch.