Air Regulator Control System

PURPOSE
The Air Regulator Control System allows the Engine Control Module (ECM) to control the power circuit of the Idle Air Control Valve
(IACV)- Air Regulator via the fuel pump relay.

OPERATION
The ECM supplies the ground circuit for the fuel pump relay for a few seconds after the ignition switch is turned on. The grounded fuel pump relay will then power the Air Regulator and the Fuel Pump. If the ECM receives a 1° signal from the crankshaft position sensor, indicating the engine is on or starting, it continuously supplies the circuit.

The ECM will power the Air Regulator/Fuel Pump circuit:

- for 1.5 seconds after the ignition switch is "on"
- while the engine is cranking and/or running
- for 1.5 seconds after the engine stops

If the 1° signal is not present, indicating a stalled engine, the ECM does not supply the ground circuit thereby preventing excessive battery discharge.