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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 277 (Instrument Cluster System) >> Diagnosis And Testing >> Instrument Cluster >> Pinpoint Tests >> Pinpoint Test Y: The O/D OFF Indicator Is Never/Always On >> Normal Operation

Normal Operation

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 overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. The O/D OFF switch is hardwired to the powertrain control module (PCM) through circuit 224 (TN/WH). When the O/D OFF function is selected, voltage is supplied to the PCM. The O/D off status is transmitted to the instrument cluster from the PCM over the controller area network (CAN).

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