Auto Shutdown (ASD) Relay & Fuel Pump Relay
WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
ASD relay and electric fuel pump relay are energized when ignition is on. These relays are controlled through PCM by switching a common ground circuit on and off. Following components are controlled by ASD and fuel pump relays:
- Alternator Field Winding
- Electric Fuel Pump
- Fuel Injectors
- Ignition Coil(s)
- HO2S Heating Element
When ignition switch is turned to RUN position, PCM energizes ASD relay and electric fuel pump relay which powers these components. If PCM does not receive a camshaft and crankshaft position sensor signal within one second of engine cranking (start-up), PCM will turn ground circuit off and de-energize ASD relay.