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  #1  
Old 04-05-2011, 09:20 AM
jjvross jjvross is offline
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Default Truck won't start !!!!!! help!

Ok I posted a question about a week age becuase of my truck not starting. I have check all fuses,relays,ignition wires all or good. The truck will turn over, everything in the truck works with the exception of the instument gauges(volt and gas) and roof cluster. I have tried a couple of scanners and all I get is can not communicate or can't see ignition. I thought that it might be the PCM or FCM(due to other posts about fuse box problems) so i replaced both with no results. I've down loaded a service manual thanks to others from the site. I've been racking my brain over all of the circuits that pertain to the PCM and Fuse box. I think i have it down to the AUTO SHUT DOWN RELAY/ENGINE CONTROL RELAY. If i jump out this relay the truck starts and works like a champ and everything is right with the world again. So looking at this the circuit it all goes back the PCM, I can't see this new PCM having the same problem as the one i just took out its brand new. Will they be damage if i jump this out temp? Or since the PCM doesn't see the ignition and will not trip this relay, what tells the PCM that the ignition is on. Any help would be great 3 weeks without my truck is starting to be a bi#&($CH
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Old 04-05-2011, 09:33 AM
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latitud latitud is offline
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Not sure if this helps, but there is some kind of inertia switch under some seats that are designed to cut of fuel in the event of a collision or roll over...not sure if the Ram has one or not but I have read stories about these causing no start conditions.
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Old 04-05-2011, 09:38 AM
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Did you swap the relay itself and check the wiring to the relay from the PCM?
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