07 PCM Swap on 05 - Having codes P0443 and P0622

**done** · 04-25-2012, 01:28 PM

I went through this process of switching to the newer style coilpacks a couple of years ago. My PCM fried and I had it towed to the dealer. They fried the first PCM they installed. They finally replaced one of the coilpacks and everything has been OK since then.

**rickdogg** · 04-25-2012, 02:11 PM

Originally Posted by done

I went through this process of switching to the newer style coilpacks a couple of years ago. My PCM fried and I had it towed to the dealer. They fried the first PCM they installed. They finally replaced one of the coilpacks and everything has been OK since then.

What codes were you getting initially?

**done** · 04-25-2012, 05:37 PM

Originally Posted by rickdogg

What codes were you getting initially?

The cylinder specific misfire codes.

**rickdogg** · 04-25-2012, 05:50 PM

Originally Posted by done

The cylinder specific misfire codes.

That was going on with 05 PCM along with coils not firing period. . Swapped coil packs over from functioning cylinders and same problem persisted so it was a harness issue to begin with, which makes a lot of sense. Now different codes show up entirely. Now we're here 2 PCM's later. Going on 3rd, which will be an 06 this time.

This ordeal was a great learning experience and expensive. If it wasn't for Hemi31 and especially AMP, this would have been very costly. Thank you so much again to the Lxf community.

**rickdogg** · 05-08-2012, 03:05 AM

Received PCM and key module the other day. Apparently, engine harness will be here tomorrow. My 1 year old spilled water all over my laptop, so I'm now using my phone for everything. I tried googling RF filter since Hemi31 told me that 06+ engine harness will have that and will need to be crimped to the filter. Anyone have a part number for what I should be lookin for?

TIA

**rickdogg** · 05-13-2012, 02:20 PM

Swapped out engine harness and new PCM. Getting misfire code P0306 Cylinder #6.

Troubleshooting attempts made:

-Swapped coil packs 4 & 6 and same issue.
-Changed out new spark plugs in #6 same issue.
-Pulled harness on injector #6 and idle stayed the same.
-pulled harness on injectors 2,4, then 8 individually to compare and all changed idle.

Thinking that it is probably a bad injector going to cylinder #6. Does anyone have a spare?

TIA,
Rick

**rickdogg** · 05-13-2012, 04:40 PM

Weird thing is upon start up there are no codes thrown until I drive around for a few minutes. If I leave it in idle, it throws no codes.

**rickdogg** · 05-14-2012, 11:39 AM

Swapped in new camshaft sensor since it was right next to water neck and easily accessible and same problem persists. Saw other thread and have crankshaft sensor as well, but haven't changed that yet since it's near the starter.

**concussion** · 05-14-2012, 04:40 PM

geeze bud, what a shamble.

**rickdogg** · 05-22-2012, 07:35 PM

Okay so after all of the above tests, we tested for power going to coil pack and injector #6. Initial tests showed that coil pack #6 was not receiving power. My uncle and AMP then recommended to get a continuity test. I felt that I did as much as I could in the parking lot of an apt complex, so I took my car to my mechanic to further troubleshoot.

Findings:

-Engine harness is fine.
-Pulse not being received on both coil pack and injector on #6.

My mechanic believes that the PCM is not sending pulse. However, I'm confused since Jon tested the PCM prior to sending it out. The grounds were all in place and the engine harness is for 06+ coil packs, so I have no idea on where to go from this point.

-Could start up tune cause this?
-Could initial ground issue hinder grounds somewhere else that new engine harness did not replace?

Any input is much appreciated. I just want my car running before my wife kills me!

**rickdogg** · 05-23-2012, 12:24 PM

I exchanged pm's with Eric (Hemi31) and he stated that the engine harness was good and came out of his personal vehicle.

However of course, to be safe I wanted to do my due diligence and source out the issue. I spoke to my mechanic this morning and he stated they did the following:

-Pulled schematics and looked up what power should be at each injector/coil pack.

-Tested pulse from PCM to each injector/coil pack using NOID light. ALL cylinder wiring were within spec with exception of #6.

-Then ran continuity test back to PCM and continuity was fine and engine harness checked out as perfect.

My mechanic was surprised as well that there aren't any codes being thrown upon start up, idle, and some cruising around. However the code of P0306 Cylinder 6 misfire is of course present once the car is put under load. He believes that there is possibly a bad driver on the PCM. As nothing else would be causing the issue in his opinion.