Main Relay (Computer/Fuel System): Description and Operation

Relay Identification:

The Auto Shut Down (ASD) Relay controls power to the ignition coil, fuel injectors, and electric fuel pump. Controlled by the Single Board Engine Controller (SBEC) the ASD supplies power to the ignition coil, fuel injectors, and electric fuel pump at all times when the ignition switch is in the START position. When the ignition switch is in the RUN position and the SBEC is receiving reference signals from the distributor, power will also be supplied. If there is no reference signal after two seconds the SBEC will de-energize the ASD and no power will be supplied to the ignition coil, fuel injectors, or electric fuel pump.