Multiplexing Implementation

WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

Currently Ford Motor Company uses two different types of communication language protocols to communicate with the Powertrain Control Module (PCM). These protocols are Standard Corporate Protocol (SCP) and Controller Area Network (CAN). Starting with the 2003 model year, Ford will phase-in High Speed-CAN (HS-CAN) for PCM communication with the following vehicles:

LS
Thunderbird
Focus 2.3L Partial Zero Emission Vehicle (PZEV)

The LS and Thunderbird will use HS-CAN between the Data Communication Link (DCL) connector and the PCM for scan tool to PCM diagnostics only. Inter communication (PCM to other network modules) for the LS and Thunderbird will continue to use SCP. The Focus 2.3L PZEV will use HS-CAN for PCM and instrument cluster (IC) module communication and for scan tool diagnostics.

All other vehicles for model year 2003 will continue to use SCP as its communication media for the PCM.