Caprice V8-265 4.3L VIN W MFI (1995)
Air Injection Pump Relay: Description and Operation
Chart C-6
The Powertrain Control Module (PCM) controls operation of the electric air pump relay which in turn controls air availability to the air injection system.
The PCM completes the ground to the coil side of the relay. The relay in turn activates the electric air pump and the integral stop valve.
