Roadmaster V8-350 5.7L VIN P MFI (1995)
Air Injection Pump: Description and Operation
The Air Injection Reaction (AIR) pump is mounted to the lower left front of the engine and supplies the air to the AIR system. The electric air pump
pressurizes air from the engine air cleaner and pumps it to the check valves near the exhaust manifolds.
The AIR pump is controlled by the Powertrain Control Module (PCM). Battery voltage to the AIR pump is controlled by the AIR pump relay. An
integral stop valve prevents air flow through the pump during "OFF" periods. When the PCM provides a ground circuit for the secondary AIR pump
relay, battery voltage is allowed to power up the AIR pump and integral stop valve. The AIR pump motor is protected by a 20 amp fuse and has its own
remote ground.
