Scan Tool Data Definitions

Scan Tool Data Definitions
Aux. Coolant Pump Relay
This parameter indicates when the auxiliary engine coolant pump is on or off.

Coolant Level Switch - Range: Low/OK
This parameter indicates when the engine coolant level is low. The scan tool displays Low when the PCM detects the engine coolant level switch is open.

Displayed Coolant Temperature - Range: 32-127° C (89-260° F)
This data is the coolant temperature the Instrument Cluster is attempting to display on the coolant temperature gauge. This data may differ from the monitored coolant temperature for a period of time due to filtering. The data may also differ from the monitored coolant temperature when coolant temperature is not in the range of 71 - 127° C (160 - 260° F) since the display is limited to these values. If a Class 2 communication failure occurs, this data will be at the minimum value of 32° C (89° F).

ECT - Range: -40°C to +150°C (-40° F to +302° F)
The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses 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.

Monitored Coolant Temperature - Range: 40 - 215° C (40 - 419° F)
This data is the clusters measurement of the engine coolant temperature as provided by the PCM on the Class 2 serial data line.

SGCM Fan Speed
This parameter indicates the commanded SGCM coolant fan speed. The scan tool displays 0-100%.

SGCM Pump Status
This parameter indicates the commanded SGCM coolant pump state. The scan tool displays On and Off.

SGCM Temperature
This parameter indicates the average coolant temperature of the SGCM coolant. The scan tool displays -40° C to +150° C.