Secondary Injector Control Module #1

Secondary Injector Control Module #1 - Circuit Diagram:

Underhood Relay Locations:

DESCRIPTION
The secondary injector control modules are computer controlled switches that supply power to the secondary fuel injectors. Module #1 provides power to injectors for cylinders #1, #3, #4, & #8. The secondary injectors are used in conjunction with the secondary port throttle valves, and supply the fuel to mix with the additional air inducted when the system is in "FULL" power enrichment mode.

OPERATION
The modules consist of solid state switches that get battery power when the ignition is turned "ON", and become energized when the ECM completes the drive circuits to ground. When energized, power is supplied to the secondary injectors. Secondary injectors share a common ground through the ECM with their primary partner, so when in "FULL" power enrichment mode, both primary and secondary injectors for each cylinder operate simultaneously, and injection remains sequential.