Distributor: Description and Operation

Computer Inputs
The distributor provides the PCM with engine speed (REF HI), fuel control (CAM HI), ignition control (BYPASS and IGNITION CONTROL) and ground reference (REF LO) information.

Computer Outputs
The PCM uses distributor information for fuel control, idle speed control and ignition control (which it outputs back to the distributor).

Fault Codes
A fault with any of the output signals between the distributor and PCM will cause various driveability conditions and should set a PCM Trouble Code.