Malibu V6-191 3.1L VIN M SFI (1997)
Temperature Gauge: Description and Operation
This function controls the Engine Coolant Temperature Gauge and the High Temperature indicator (red). The Powertrain Control Module (PCM) reads
the Engine Coolant Temperature Sensor and sends the information to the Body Function Controller (BFC) via Class 2 serial data link. The Body
Function Controller (BFC) converts the Powertrain Control Module (PCM) data into gauge data for the Instrument Cluster sent via Serial Peripheral
Interface (SPI) serial data link. The Body Function Controller (BFC) also sends the High Temperature indicator ON/OFF request to the Instrument
Cluster via the Serial Peripheral Interface (SPI) serial data link. The Instrument Cluster receives the Engine Coolant Temperature Sensor information via
Serial Peripheral Interface (SPI) serial data link and converts it into a Temperature Gauge pointer position.
