So it has been starting using the 05 pcm? Started today, died and then wouldn't crank?

 

I’ve started it a few times today yes

 

It won’t turn over. It won’t click or anything. Battery has a full charge.

 

Sounds like you have lost neutral/ park safety switch. Jiggle your shift lever.. or jump the saftey switch.

 

jiggling the lever didn’t work. Where’s the switch located?

 

Should be on the trans, not sure of the exact spot on the 545rfe. That could also be something with the trans wiring that got changed over. And triple check all the grounds

 

Can’t be any wire swap problems. It worked for a while after I did the swap.

 

I just unplugged the starter solenoid wire to see if any power was going through it. And the wire is not hot. This has got to be some dumb fix.

 

Try disconnecting the battery and doing a reset.

 

Take a look at this schematic and you can see the circuit. Is the ASD relay energizing?

 

update... I jumped the starter solenoid wire to the battery and turned the switch. The starter turned over. That would mean the park/neutral safety switch right?

 

Which one of these is the park/neutral safety switch?

 

Turn the key on and look at the dash of the shift indicator is working correctly and shows what gear your in and won’t start in park or neutral then it is likely the ignition switch side of things as the park switch is not a known issue in the Rams at all.

 

shift indicator works. Tried moving the shifter a few times through the gears and still nothing. I have a key switch otw

 

Pin #22 p/n sense is your ground sense. This ground sense goes to the pcm. The pcm then creates a ground for c7 23 of the first diagram. Allowing the starter to crank when key is turned on. An alternative is to connect c7-23 to a makeshift p/n switch to start the truck.

 

I’ll check it out. Maybe one of my connections got loose. Just don’t make sense why it’s been working and quit all the sudden

 

How did you make all your wire connections? Solder and heat shrink tape? Crimps? Wire nuts? Just twist the wires together and walk away? Haha

 

crimps

 

The installation quality of crimps can vary widely and often become problematic including difficult to troubleshoot. For most of us who don't have the expertise or tools to properly crimp wires use solder and heat shrink to make consistant high quality splices. Makes life much easier not having to constantly troubleshoot intermittent connections. I highly recommend you go back and remove the crimped connections and replace with soldered splices and quality heat shrink covers. You will thank yourself. No one likes electrical gremlins.

 

It was expensive, but I spent the extra cash and bought an OEM pigtail which came with more pins and wires than you will ever need as well as the quality shrink tubes.

 

I had very little splicing to do since c4 was totally removed. The few pins I needed I took from a spare plug. Something to be said for stand alone trans.....

 

It wasn’t a pin out problem or a connection problem. I replaced the ignition starter switch too. It wasn’t that. Any other ideas? I’m so lost

 

Ok, lets start over again. When the trans is placed in p/n it creates a ground sense to the pcm. The pcm senses this ground and internally creates another ground that goes to the starter circuit allowing the starter motor to crank. So first go to the trans plug and test the wire for a ground condition. I'll post the wire that needs to be identified and tested. If someone else has it handy they are welcome to post it..

 

I remember having trouble with finding a good quality ground spot. Ended up drilling a Holt for a screw on the frame somewhere. So your starter is not engaging at all? There is also a wire connector near the fuse box that’s the trigger wire for the starter motor. You can hit that on the battery terminal and try turning the key to start the truck. That could help isolate where a problem is originating, starter side or control side

 

I remember having trouble with finding a good quality ground spot. Ended up drilling a Holt for a screw on the frame somewhere. So your starter is not engaging at all? There is also a wire connector near the fuse box that’s the trigger wire for the starter motor. You can hit that on the battery terminal and try turning the key to start the truck. That could help isolate where a problem is originating, starter side or control side[/QUOTE that was the first thing I tried. Starter is good and has power

 

I walked him thru testing power and wiring to the starter it’s all good. Only thing missing is the pcm ground control so it’s either a bad pcm, bad safety switch or a skim module issue if it’s in there

 

Could it be the key immobiliser? I’ve been doing some reading. The skim in the immobiliser has to match the vin and all that.

 

Ground c7-23 to act as p/n. This takes the pcm out of the start loop.

 

where is c7-23?

 

Its the same wire as c3-38 at the pcm but the other end at the IPM. DG/OR

 

Can you hear your fuel pump prime with key on before start? You may have an intermittent crank or cam sensor signal. IIRC no signal from either of those is a no crank situation. What brand are they? Mopar only!!!

 

When ignition is turned on, the ASD relay energises for around 5 seconds. Suppling power to fuel pump, ignition and injectors. If no rotation is sensed, the ASD relay de-enegises. Cranking the engine is enough to keep the ASD relay energised.

 

Power is getting from the key switch to the starter solenoid relay. But no further. Jumped the starter solenoid wire and held the key to start. Wasn’t getting spark

 

This makes sense if there is no p/n ground present..
I would identify c3-38 (DG/OR), strip back the insulation in a convenient place and attach a ground jumper wire and see if it will crank. My money says it will.

 

It’s throwing 101 unreadable trouble codes for the pcm. Could I have bought a bad pcm? Or could something I changed made the pcm. Throw this many codes? There wasn’t even 101 wires that I had to change

 

Check ASD relay.. didn't you say the fuel pump runs when the key is turned on?