Instrument Panel Cluster (IPC): Speedometer

The Powertrain Control Module (PCM) calculates the vehicle speed from the transaxle Output Shaft Speed (OSS) sensor input and from the tire size and axle ratio configuration in the Powertrain Control Module (PCM) Vehicle Identification (VID) block. The Powertrain Control Module (PCM) provides the Instrument Panel Cluster (IPC) with a vehicle speed data message to command the speedometer pointer.

The Instrument Panel Cluster (IPC) provides a tolerance which allows the gauge to display between 3% lower and 7% higher than the actual vehicle speed. This means that with an actual vehicle speed of 96.6 kmh (60 mph), the speedometer may indicate between 93.7 kmh (58.2 mph) and 103.3 kmh (64.2 mph), which is normal.