Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Ok, I thought so. You have a failed PCM. If all fuses are good, and no communication, try this last test: Disconnect the cam,crank, TPS, MAP and AC transducer sensors. See if it will now communicate. If so, then one of those sensors is shorted and pulling the PCM's 5 volt reference down, and that sensor will need to be replaced. If it still will not communicate after doing this, then replace the PCM.
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Okay, click on the link below to see the connector I have highlighted the terminals that should have power. be sure the ignition switch is on when checking them.
Ok, pin 29 should show close to 12 volts all the time. So that is an issue. Let me see where Pin 29 gets it's power from.
Ok, terminal # 29 gets it's power from fuse # 23 in the under hood fuse box/PDC. See if that fuse is good, and if there is close to 12 volts on the little test tabs on the fuse (both test points need to have power). I have to run an errand but will have my phone with me and can check in with you through it.
It will be a solid red wire and goes from the fuse box (IPM) to the C130 connector under the hood, then to the PCM. C130 is near the PCM.
Here is a picture:
Aha! Now we are getting somewhere. So that tells me there is excessive resistance in that red wire somewhere between the IPM (underhood fuse box) and the PCM. Disconnect that C130 connector ( location is shown in the picture I sent you earlier today). See if there is corrosion, or damaged terminals in the connector. If not, then you could always run a permanent wire from the battery positive cable to the red wire on the PCM and solder it so it has a good connection. That would work for now.
One end goes to the fuse box Where it gets it's power (should be 12 volts) and the other end goes to the C1 terminal 29 connector at the PCM. So if you only have 0.6 at the C130, then the problem is either inside of the IPM /fuse box, or a wire issue in the harness between the the IPM/fuse box and C130 connector.
So maybe the cheapest way to resolve this is to run a separate wire from the positive battery cable to the PCM C1 connector red wire and solder it/tape it.
That would be a very good idea. Maybe an inline fuse holder with a 20 amp fuse in it. You can get that from your auto parts store.
Thank you! Glad we finally got this one figured out!
Thank you for using just answer!