Information Bus: Description and Operation

CIRCUIT OPERATION
Circuits D1 and D2 connect the Powertrain Control Module (PCM) to the CCD Bus. Circuit D1 connects to cavity C3O of the PCM. Circuit D2 connects to cavity C28 of the PCM. Circuits D1 and D2 are a twisted pair of wires.

Several modules and controllers broadcast and receive data on the CCD Bus. Each module or con troller is enabled to receive only certain messages. The PCM broadcasts the following messages on the CCD bus.
- Engine RPM
- Injector on-time and distance pulses
- Vehicle speed
- Engine temperature
- Battery temperature
- Oil pressure