Controller Area Network (CAN)

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The CAN is an unshielded twisted pair cable, data bus plus, circuit 3126 (TN/YE) and data bus minus, circuit 3125 (RD/YE). The CAN is not designed to operate under single point fault conditions. If either circuit is shorted to voltage or the CAN data plus is shorted to ground, module-to-module and module-to-tester communication is not possible. If the CAN data minus is shorted to ground or an open exists on either bus line, module-to-module and module-to-tester communication is marginal at best.

There are 2 terminating modules on the CAN, which are the powertrain control module (PCM) and the instrument cluster located at the far opposite ends of the CAN wiring. The CAN bus may remain operational when one of the two termination resistors are not present. If there are issues with the CAN, there may be missing functionality and problems connecting with a diagnostic tool.