Normal Operation
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives the vehicle speed sensor (VSS) signal from the powertrain control module (PCM) over the communication network. The instrument cluster monitors the VSS input from the PCM and commands the speedometer with a corresponding movement of the pointer. The odometer is tamper resistant and accumulates and registers up to 1 million kilometers in metric mode or 1 million miles in English mode, based upon rolling count data sent from the PCM over the communication network.