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Home >> Dodge and Ram >> 1994 >> Viper V10-488 8.0L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Main Relay (Computer/Fuel System) >> Description and Operation >> Auto Shut Down (ASD) Relay
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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.
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