Circuit Operation

FUEL DISPLAY
The fuel level sensor provides a signal to the instrument cluster that is proportional to the fuel level. With a full tank, the fuel gauge sender resistance is 88 ohms; with an empty tank, the resistance is near 0 ohms. The instrument cluster converts the analog signal from the fuel gauge sender to a digital signal that controls the air core fuel gauge display.

TEMPERATURE DISPLAY
The instrument cluster receives engine coolant temperature data from the Powertrain Control Module (PCM) over the serial data line. The cluster displays engine coolant temperature with an air core display.

SPEEDOMETER AND ODOMETER
The Vehicle Speed Sensor (VSS), mounted in the transaxle, generates an AC voltage signal with a frequency proportional to vehicle speed. The PCM processes the VSS signal from the sensor and produces a 4000 pulse per mile output signal on CKT 817 (DK GRN/WHT). The PCM provides this output signal, switched to ground at a rate proportional to vehicle speed, to the instrument cluster. A circuit board in the cluster operates the speedometer and odometer. The circuit board converts the PCM output signal into a control signal which drives the stepper motors.

"LOW WASHER FLUID" INDICATOR
The washer fluid level switch provides a signal when washer fluid is low. The switch grounds the cluster input on CKT 99 (BLK/WHT), turning on the "LOW WASHER FLUID" indicator.