Temp. Gauge Position

Range: 0 -255 Counts
This data indicates what message is being sent from the BCM to the instrument cluster in order to control the temperature gauge pointer position. The PCM performs the following functions:
1. Reads the engine coolant temperature (ECT) sensor
2. Filters the sensor
3. Sends engine coolant temperature to the BCM via the class 2 serial data line.

The PCM also monitors the ECT sensor. The PCM will set a DTC if the ECT sensor is malfunctioning. The BCM performs the following functions:
1. Converts the PCM class 2 serial data ECT sensor message into SPI count units.
2. Sends the class 2 serial data message to the instrument cluster in a SPI message.




The instrument cluster then drives the temperature gauge pointer. The temperature gauge SPI counts value to the temperature gauge (pointer) position ratio are included in the following table: