teknic

I’m thinking this will be the final update. After my most recent post the issue reoccurred in the next few days but only when idling for a bit and it would go away quickly. at this point the tach hasn’t stopped working in over 2 weeks even when idling. my only thought is oil was wicking thru the harness and into a connector enough to confuse the system. Now that the leak has stopped and it’s been driven a while all the oil is gone and no longer causing me any issue. when I started diaging this I never would’ve thought of this conclusion. thanks for all the help!

Ok guys so it’s been ages but I’ve finally got an update…. And it’s one I didn’t expect. with first nice weekend weather I decided to finally replace my Tappet cover which has been leaking for years and finally got bad enough that I’d lose multiple quarts in a drive. did the whole job, following a guide here, installed a Keating Billet Tappet cover and bypassed my OEM fuel filter that I hadn’t used in years. since finishing that job my tach and other gauges began working. Thinking it was probably just random I didn’t pay much attention to it. However today the CEL went off by itself and I realized my gauges haven’t died in about a week. It’s never made it more than a day. so, knock on wood, I may have fixed it. The exact cause no clue, possibly oil getting into ECM? Oil misting into connector and messing with signals? Maybe just disassembling, cleaning and reassembling that area? Who knows, but I’m actually hoping it’s finally solved. wanted to be sure to post here in case anyone else is going through something similar. thanks for all the help, here’s hoping it’s actually fixed!

Truck sorta fell to back of my list, still planning on updating this but so far I have done nothing new

Small update as I’ve been dealing with random stuff, acquired the necessary file from Smarty to flash an ECM with my trucks factory files. Anyone interested in it you contact sales@smartyresource.com and they’ll help you out. Price is up to $150 at the moment. bought the 2000 truck, registering it on Saturday and then get it home and hopefully swap the ecm and see what happens. will update when there’s news

Bit of a detour to the plan, ran across a deal I couldn’t pass up a 2000 2500 Cummins shortbed with the gray interior I was looking for, guys asking 3500 so going to be picking that up probably for 3200 Then I found a Smarty s-03 for $350 and contacted smarty who said they can provide me a file to reprogram that 2000 auto ecm to a 2001 6speed ecm. So once I have both here I’ll swap the ecm over and see if it fixes it. Fingers crossed that it does, then I’ll just get any ecm and flash it to the 2000 truck and steal its interior and turn it into a farm truck. if it doesn’t fix it I’ll ship my pcm out to ACS and go from there feel like I need to start a build thread.

Oh and it’ll probably be a few weeks before I send it out, need to pick up another door and a nice dark grey interior for the truck restoration progress.

Lol I threw an ECM at it once hahaha but I tested before that too, just not as thoroughly. Think I just got a badly rebuilt ecm. On the bright side I now know a lot of the wiring. I’ll definitely keep this thread updated on outcome

Ok so I think I’m going to send my ECM and PCM out to “Auto Computer Specialist” and see what they find, hopefully they can recreate my issue and I can get this solved and onto better ways to spend my time on the truck. while it’s down I’ll prob finally swap the dash and all the HVAC stuff plus sound deaden and install my new black carpet

Ok quick update pulled my radio and HVAC panel… 2 pin CCD Connector nowhere to be found, see pic attached. Pulled back that wire covering too, no cut wires no loose wires nothing. If anyone out there could get a picture of their radio C3 connector and see/show where it comes from in the harness id be immensely grateful. Mainly need to know where it comes from, because if it comes out the same spot as the end of that red circle I’ve got no clue where this plug went Update: Alright I decided to pull out Junction Connector 7, to the left of the steering wheel which is where all the CCD lines join. I looked at pins 17 and 20 which is where Radio C3 should terminate, they’re not there. I think my truck just doesn’t have that connector, let me know if I’m wrong.

Alright I’ll rip into it and report back, I know there was no connector so I’m sorta thinking/hoping someone clip the wires somewhere and they’re randomly shorting Just posting this pic for my own and others references, the radio ccd connector is “Radio C3” in service manual. Located in Figure 25 of connector locations. (Figure is from angle of you looking from firewall towards radio) in the figure you can see it should branch off the C1 and C2 bundle just a few inches before the C1 and C2 connectors.

That’s so weird I even just pulled up the service manual and see the radio C3 connector with 2 pins. well I guess I’ll be tearing in there later maybe that thing is crushed somewhere. do you know if it’s bundled with the 2 main radio connectors?

ok yea so my cluster definitely shows no codes after the test, so it’s good. Hm I couldn’t find any extra plugs at my radio, would this 2-pin connector be in the same bundle as the other 2 connectors? I have no audio controls on my steering wheel, just cruise control. I have 2 connectors that are like 6-7 wires each that go to radio, 1 antenna lead, 1 wire that is single pin slip on connector like how you see on oil oil pressure sensors, and then a big round plug that I think is the 6-disc changer. I tried reaching around and didn’t find any loose wires. Any chance you have a picture for reference?

Ahh ok yea I’ve never seen those pop up at all

Attached are the codes the cluster shows. yea I’m thinking the ECM and PCM need to get tested and gone over. Going to do the WT wire Mod first for the hell of it.

Yes while the 3 gauges were dead I performed the cluster test, all needles moved correctly and at the end it saw codes p1693 and p1694.