The coolant temperature sensor is located in the engine water jacket and is a resistive type sender. The sensor connected to the Powertrain Control Module (PCM) via discrete inputs. The filtered coolant temperature data is sent from the PCM to the IPC, via the class 2 serial data line. The IPC uses the temperature data received from the PCM and a software program to determine the proper coolant temperature gauge pointer position. When the IPC receives the coolant temperature via class 2, it compares the data to a calibratable look up table for the northstar engine configuration. The coolant temperature is transmitted over the Class 2 serial data link on a change of 1 degree Celsius or more.

A fuel sender is located in the fuel tank and is a resistive type sender. The fuel sender is connected to the Rear Integration Module (RIM) via discrete inputs. The filtered fuel data is sent from the RIM to the IPC, via the class 2 serial data line. The RIM sends the IPC filtered fuel data on a change of 0.5 liters or more with a resolution of 0.10 liters. The IPC uses the fuel data received from the RIM and a software program to determine the proper fuel gauge pointer position. The IPC updates the display within 300 milliseconds of receiving the data from the RIM, if the IPC can not communicate with the RIM, the fuel gauge pointer indicates empty, the IPC sets a DTC, and dashes are displayed in all DIC fuel information.

The IPC is equipped with a secondary PRNDL display. The display conveys the current selected gear (P,R,N,D,3,2,1). The IPC PRNDL information is recieved from PCM over the class 2 serial data line.

The reflective display is a secondary digital display used to display the vehicle speed and turn signal indicators along with PRNDL information. The digital speed display is in synch with the analog speedometer gauge. The reflective display is enabled by pressing the DSPL MODE button, the default mode for the display is off. The IPC stores the state of the reflective display for each ignition cycle.

The engine RPM is calculated by the Crank Position Sensor (CKP) sending a signal to the Ignition Control (IC) Module. The IC module sends a signal to the Powertrain Control Module (PCM), which is filtered and sent to the IPC via circuit 121 (WHT). The signal is a square wave with a 50 percent duty cycle.

The Vehcile Speed Sensor is located in the transaxle. The sensor connected to the Powertrain Control Module (PCM) via discrete inputs. The filtered vehicle speed is obtained by the IPC via circuit 817 (DK GRN/WHT) from the Powertrain Control Module (PCM). The IPC uses the vss data received from the PCM and a software program to determine the proper speedometer gauge pointer position and/or digital display. This vehicle speed pulse train is expressed as 4000 pulses per mile. Any calculated speed above 150 MPH or 242 km/h is ignored and the last valid speed is displayed.