Viper V10-488 8.0L (1992)
Main Relay (Computer/Fuel System): Description and Operation
Auto Shut Down (ASD) Relay
PURPOSE
Relay supplies battery voltage to fuel injectors and ignition coil when energized by Powertrain Control Module (PCM).
OPERATION
The Powertrain Control Module (PCM) energizes ASD relay by supplying relay ground, when ignition switch is in START or RUN position and
PCM is receiving a reference signal from distributor.
When the ground is applied, the relay is energized, and voltage is allowed to flow to fuel injectors and ignition coil.
When PCM does not receive reference signal from ignition system, (indicating engine is not running), then the PCM interrupts relay ground circuit
and no voltage is supplied to fuel injectors and ignition coil.
The PCM controls fuel pump relay and Auto Shutdown (ASD) relay simultaneously, through same ground circuit.
