Engine Idle Hour Meter (Police)
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives the digital transmission range (TR) sensor status message from the PCM over the high speed CAN, and if the engine speed is greater than 400 rpm, it records the amount of time the engine runs with the transmission in PARK or NEUTRAL.