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Electrical 2nd Gen Dodge Ram Electrical Problems and Questions.


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Old 10-10-2012, 11:35 PM
mikeyt mikeyt is offline
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Default code p1389

looking at a 2001 ram 2500 with 5.9 gas on car lot. really like the truck, good price. hooked up my scanguage and it shows p1389 no autoshutdown (asd) relay output voltage at pcm. knowing from previous codes on different cars that these codes can mean various things, does anyone know what this could mean? really need information fast as they have it priced very low and i dont want to miss out on a good truck, if it is not a big problem to fix
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Old 10-11-2012, 04:10 AM
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Default

P1389 No Auto Shutdown (ASD) Relay Output Voltage At PCM

possible suggestions

If you want to rule out a relay find the asd relay in the fusebox, find another relay that will be the same like wipers maybe, horn etc and switch them, if it now works then match up the relay! if it doesn't then you'll have to check the circuits to it!

---------------------------------------------------------------------
Automatic Shutdown Relay

by Bob O’Neill and Bob Lincoln

The power supplied to the fuel pump, ignition coil, fuel injectors, and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.
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From about 1990 on, the ASD relay was in a plastic underhood relay box at the left fender well.

The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, or if the turbo boost pressure reaches and exceeds the over boost cut-off point, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module. This causes the engine to shut down.

http://www.allpar.com/fix/codes/sens...-shutdown.html
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