Instrument Cluster Description and Operation: Speedometer

The IPC displays the vehicle speed based on the information from the vehicle speed sensor. The ECM converts the data from the vehicle speed sensor to a 4,000 pulses/mile signal. The IPC uses the vehicle speed signal circuit (4,000 pulses/mile) from the ECM in order to calculate the vehicle speed. The vehicle speed signal circuit is pulled up to controlled B+ in the IPC. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists. The speedometer displays either miles or kilometers as requested by the activation of the English/Metric setting on the driver information center (DIC). The associated indicator, MPH or KM/H, illuminates.