Operational Modes

The PCM operates in two basic modes:

Normal Mode:
1. Normal operation
a. Computer and outputs operating properly and system voltage is between 10 and 16 volts.
b. Computer is operating properly, the outputs are non-functional and the system voltage is greater than 16 volts.

Backup Mode:
1. Backup operation
a. When system voltage is between 4.5 and 6 volts.
b. When system voltage is between 16 and 24 volts.
c. When the PCM is not operating properly. During this mode of operation the PCM will go into backup fuel operation, light the malfunction indicator lamp, keep the fuel pump and electric engine cooling fan energized.