For 1990-2009 cars only
ECT Sensor 1: The scan tool range is -40 to +152°C (-40 to +419°F). The engine coolant temperature (ECT) sensor is a thermistor which changes internal resistance as the temperature changes. When the sensor is cold, internal
resistance high, the powertrain control module (PCM) monitors a high signal voltage and interprets the voltage as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm
engine.
ECT Sensor 2: The scan tool range is -40 to +152°C (-40 to +419°F) / 0.0-5.0 Volts. The engine coolant temperature (ECT) sensor is a thermistor which changes internal resistance as the temperature changes. When the sensor is cold, internal resistance high, the powertrain control module (PCM) monitors a high signal voltage and interprets the voltage as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine. The ECT sensor 2 is located on the radiator side of the thermostat and typically reads a lower engine coolant temperature than ECT sensor 1.
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.
ECT Sensor 2: The scan tool range is -40 to +152°C (-40 to +419°F) / 0.0-5.0 Volts. The engine coolant temperature (ECT) sensor is a thermistor which changes internal resistance as the temperature changes. When the sensor is cold, internal resistance high, the powertrain control module (PCM) monitors a high signal voltage and interprets the voltage as a cold engine. As the sensor warms, internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine. The ECT sensor 2 is located on the radiator side of the thermostat and typically reads a lower engine coolant temperature than ECT sensor 1.
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.
