Temperature Gauge: Description and Operation
Engine Coolant Temperature GaugeThe engine coolant temperature gauge (part of the LCD Display) is controlled by the CPU in the gauge assembly. The ECT sensor sends a coolant temperature signal to the ECM through the RED/WHT wire (cavity C26). The ECM then sends a coolant temperature signal to the CPU in the gauge assembly through the LT GRN/RED wire (cavity A4). The CPU controls the LCD display to turn on the correct number of segments to indicate the coolant temperature.
Refer to the Gauges System for specific tests or troubleshooting procedures.