3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
truck ran great til last friday night. took it on a 75 mile trip parked it for a few minutes and went to start it back up, had full power (windows, radio, lights etc...) but the gauges wouldnt move when key was turned to the on position, fuel pump wouldnt turn on, shifter indicator wasnt present around the gears. after messing with it for a few hours and not finding the problem i was going to have it towed home. but then it started up fine and drove home no problem. drove the truck sunday with no issues. went to start it last night and wouldnt start, same problem.
after a bunch of testing and digging around i found that the ASD relay isnt getting the ground signal from the pcm. im able to manual ground the relay to start the truck. anyone know what the issue might be? would a new pcm fix the issue or could one of the modules be causing the pcm not to function properly. i know our trucks have more computers then a caddy so anything could be causing the issue.
also there is no obd2 signal when asd relay isnt working. no check engine codes. and also since the first time the problem happened on friday my out side temp reading on the overhead console has read 130 degrees
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Look under your fuse box. The 2002-2005 had lots of corroding issue's on the underside. You might be a victim of the corrosion.
Best bet is to flip the whole thing over or if you can get under there somehow and take a peek at the terminals. I woiuld squeeze all kinds of dielectric grease in there while your in there.
i pulled the fuse box last night and all the connections look good. since i bought the truck a few years ago my trailer lights didnt work on the left side due to a bad internal relay on the circuit board of fuse box. the pcm isnt grounding the asd relay as is should but in starting to think maybe the fuse box or the front control module is bad.
called the dealer and a new fuse box is $475 and is on back order and they have no clue when they could have it, said at least a few weeks. tried finding a used one but no luck, found some at a local yard that specializes in the srt10, fuse box looks the same but different part number so im guess its different and will not work.
found a used pcm at a yard 1.5 hours away that i think ill drive to after work and get today, i do have access to a scanner to program the pcm so i guess ill start with that and see if that fixes it and go from there
I had a similar problem as you but with my Dakota. I ended up changing out lots of parts: fuel pump, MAP sensor, coil, alternator, ABS speed sensor... The feedback I got from other members was that a component in the system was causing an internal short after warming up and tripping the ASD relay. I finally decided it was the PCM and swapped it for a rebuilt unit. About 6 months now and no problems.....
2005 QC 1500 Hemi, 20's, 3.92 LSD, fog lamps
DNA grill, de-badged/re-badged
Superchips Cortex 3950, AT3030
Rear lowering shackles, Cooper Zeon LTZ's
turned out to be the fuse box took a crap. good luck finding a new one and dealer is $475 for a new one and they are on back order and dont even have an estimated date. fuse box was only sending out like 2 volts to the pcm, i was able to wire it directly to the battery with a fused line til im able to get a new fuse box
I was able to disassemble and find the problem with the IPM. There was a hint on the outside of the IPM
Inside there was a spot where the trace completely corroded off the board:
At first it appeared that this spot did not affect the circuit. Looking at the other side of the board, there were two solder points exactly opposite of the corrosion on the board. They are actually connections to the other side except the trace on the other side was gone leaving an open in the circuit:
Carefully, I removed some of the green coating on the trace that was still left adjacent to the corrosion:
Next I soldered a strand of wire between the two holes and to the trace that was left:
I am fairly certain that this what was causing the no start. I have reassembled the IPM and will keep it as a spare.