Circuit Description

A serial data communications system is used on these vehicles to allow various modules to communicate and share information with each other. Each bit of information has 2 lengths, long or short. This allows vehicle wiring to be reduced and the transmission and reception of multiple signals over a single wire. The messages carried on a Class II serial data streams are also prioritized. If two messages attempt to establish communications on the data line at the same time, the message with a higher priority will continue. The message with a lower priority will wait. If a module cannot respond to the PCM, a DTC will set.

Conditions for setting DTC:

• Ignition on.
• System voltage greater than 8.2 volts.
• PCM cannot communicate with EBCM.
• Conditions present longer than 5 seconds.