Certain instrument panel cluster (IPC) features are tested when the ignition is turned on in order to verify the features are working properly. The following occurs at key up:

Refer to Indicator/Warning Message Description and Operation .

The IPC uses the engine coolant temperature sensor to determine the engine coolant temperature. The engine coolant sensor signal circuit is hard-wired to the IPC. The engine coolant sensor signal to the IPC is a variable resistance ranging from 61.9 to 1305 ohms. A coolant temperature sensor resistance of approximately 1305 ohms will indicate a gage temperature of approximately 40° C (104° F). A coolant temperature sensor resistance of approximately 61.9 ohms will indicate a gage temperature of approximately 118° C (244° F).

The multifunction alarm module (MFAM) activates an audible warning and illuminates the check gages indicator in the IPC when the engine coolant temperature is at or above 118° C (244° F).

The IPC uses the engine oil sensor signal to determine the engine oil pressure. The engine oil pressure sensor signal circuit is hard-wired to the IPC. The engine oil pressure sensor signal to the IPC is a variable resistance ranging from 0 - 90 ohms. An engine oil pressure sensor resistance of approximately 1 ohms displays as approximately 550 kPa (80 psi). An engine oil pressure sensor resistance of approximately 88 ohms displays as approximately 0 kPa (0 psi).

The MFAM activates an audible warning and illuminates the check gages indicator in the IPC when the engine oil pressure is at or below 34 kPa (5 psi).

SINGLE TANK

The IPC uses the fuel level sensor signal to determine the fuel level. The fuel level sensor signal circuit is hard-wired to the IPC. The fuel level sensor signal is a variable resistance (0-90 ohms) based on the fuel level. When the fuel tank is full, the fuel level sensor resistance is high. When the fuel tank is empty, the fuel level sensor resistance is low.

DUAL TANK

The IPC uses the fuel level sensor signal to determine the fuel level. The fuel level sensor signals are variable resistances (0-90 ohms) based on the fuel level. When the fuel tank is full, the fuel level sensor resistance is high. When the fuel tank is empty, the fuel level sensor resistance is low. The fuel sender and transfer pump control module monitors the signal circuits of the primary and the secondary fuel level sensors in order to determine the fuel level. Based on the sensor resistance , the fuel sender and transfer pump control module calculates the total remaining fuel in the fuel tank. The IPC receives the total fuel remaining from the fuel sender and transfer pump control module via the fuel level sensor signal circuit. The fuel sender and transfer pump control module averages the resistance of the primary and the secondary fuel level sensors to produce a single resistance equal to the average level of both tanks.

The IPC contains a season odometer and a trip odometer. Briefly pressing the trip/reset switch on the IPC will toggle between the season odometer and the trip odometer. Pressing the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, will reset the trip odometer. The IPC displays the vehicle mileage and trip mileage as determined by the IPC. The IPC calculates the mileage based on the vehicle speed signal.

The IPC displays the vehicle speed based on the information received from the speedo adapter. The speedo adapter converts the data received from the vehicle speed sensor into a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the speedo adapter in order to calculate the vehicle speed. If the IPC detects a malfunction in the vehicle speed signal circuit, the speedometer defaults to 0 km/h (0 mph).

The IPC displays the engine speed based on information received from the ECM. The ECM converts the data from the engine speed sensor into a 2 pulses/engine revolution signal. The IPC uses the engine speed signal circuit from the ECM in order to calculate the engine speed. The tachometer defaults to 0 RPM if a malfunction in the engine speed signal circuit exists.

The IPC displays the system voltage as detected at the ignition 1 input of the IPC. The voltmeter measures the electrical system voltage when the ignition switch is in the RUN or START position.