Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
A Class II 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. Messages carried on a Class II serial data streams are also prioritized. If 2 messages attempt to establish communications on the data line at the same time, message with a higher priority will continue. Message with a lower priority will wait. If a module cannot respond to PCM, a DTC will set.
Condition for setting DTC is:
- PCM cannot communicate with Body Control Module (BCM).