S2000 L4-2.2L (2004)
Temperature Gauge: Description and Operation
How the Gauges and Indicators Circuit Works
The indicator lights are controlled by different conditions in their associated systems.
Engine Coolant Temperature Gauge
The 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 YEL/GRN wire (cavity C7). The CPU controls the LCD display to turn on the proper segments indicating the coolant temperature.
