Cruise Control experiment a success

acesneights1 · Feb 17, 2008

So I finally swapped my T/S switch on the hope that the truck will now have cruise. After two hours of messing with it(BTW yes I did install the fuse for it also) no good. So I guess that's that. Time to look at whether it's a different ECM. Everything went together nice and wipres, T/S work fine. Just no criuse. What a dissapointment. I have a bad cold and possible a touch of flu but had planned this weekend for the swap and I wasn't giving in. Here's the pics . I wanted to do an extensive write up upon success of all the little things you run into that aren't in the book but why bother it won't work anyway.:damnit1::shootself:cussing:

teroma25 · Feb 18, 2008

LMAO, is that a "Mr T" air freshener in the first pic? I need one of those to hang off the mirror!

on edit: sorry it didn't work.

acesneights1 · Feb 18, 2008

teroma25 said:
LMAO, is that a "Mr T" air freshener in the first pic? I need one of those to hang off the mirror!

on edit: sorry it didn't work.

Yes it is. And I'm proud of it !!!

Smells just like his armpits..

acesneights1 · Feb 18, 2008

Hey I was thinking on this. My ECM was replaced by a local shop with a junkyard one. It said on it in yellow junkyard paint 96 3500 Diesel. When I went through this with Bill Heath he had me pull the ECM and give him the #s on the chip and also (painstakingly) get the Numbers off the IP. He said the chip I had belonged in a 1 ton ambulance and he was surprised the truck ran at all. So he set me up with a Maxi Torque( not the newest one mine is about 4-6 months old)said it would clear up my problems. He even offered to try and find me a stock one that belonged in the truck if I wanted to but I went with the Maxi. Truck runs great tranny feels great etc. My question is isn't a 96 OBD II and if I pulled the chip myself and replaced it with a Heath then my ECM can't be out of a 96 correct ? I'm wondering if this junkyard ECM somehow is not programmed for Criuse. Is that possible ?

ghitch75 · Feb 18, 2008

the 96 3500 may not have had cruise control....if it came from a plane jane cab & chassie it might not have...was there any extra plugs or wires?....might be some pins missin' on that ecm

acesneights1 · Feb 18, 2008

Thats what I'm trying to figure out but would a 96 3500 ECM be OBD1 because my Tahoe defintely is. My line of thinging here is around 96 when airbags became standard and so did OBD 2 that heavy duty vehichles such as 3500 series were still exempt. Like my 2000 has no airbag.

acesneights1 · Feb 18, 2008

Now I'm getting nervous that may be my problem I may be calling Heath tommorow about this one. I hope the chip will work in a different ECM. That would suck. If it even is the problem.

ghitch75 · Feb 18, 2008

i thought 96's where OBDII...just 94 & 95 where OBD1????....you have to send the ECM to him for OBDII....you just change the chip for OBD1...thats the way it says on his site..

acesneights1 · Feb 18, 2008

You know Dammit when I posted about that Tahoe 2 door at the junkyard I remember looking at the ECM saying to myself I should buy that it probably is the right one for my truck. I'll bet it's gone now.

knkreb · Feb 18, 2008

Hey, ask heath about the chip if the programming is on the chip or the ECM about the cruise... wondering if there is a problem in the system somewhere that is hindering it from working... like a code or something maybe?

acesneights1 · Feb 18, 2008

no codes.

acesneights1 · Feb 18, 2008

I thought about that too. For the life of me I can't remember when i ordered the Maxi torque if Bill asked about cruise. That would suck if that was it.

IamDave0887 · Feb 18, 2008

hey aces. this is on your 95 tahoe correct? just for shits and giggles wheres your PMD? i know when those started to go bad you would lose cruise control. i see your 2000 has the heath kit though.

acesneights1 · Feb 18, 2008

Still on the pump and factory no issues with it yet but I think my problem is the wrong ECM in the truck. Gonna call the junkyard tommorow that had that Tahoe. It was the twin to mine and had cruise. I just hope they still have the ECM. I have the relocate kit for my PMD but I was waiting till I had time to do everything in one shot.
New glows
new injectors
F intake swap
and finally PMD relocate.
If the ecm fixes it then I'll do an extensive writeup on the details of the swap.

IamDave0887 · Feb 18, 2008

what relocate kit do you have? i'm guessing heath's? i'd say try the PMD kit first. maybe you'll get lucky. i believe that the cruise control fails before anything major like stalling, etc, etc happens. not sure on that one though. but maybe since you've got the kit you may not have to spend the money on that ECM. could save you a few bucks. worth a try. either way good luck figuring this out. i wanna know how it goes because i've got a busted hazard light switch so i'll be replaced the turn signal switch soon and want to get one with cruise if possible. thanks aces.

- Dave

acesneights1 · Feb 18, 2008

I'll let you know. I still think it's the ECM because it was swapped on this truck and out of a 3500 with possibly no cruise.Like I said once I get it figured out I'll do an in detail write up. There are things I encountered that are not in the book.

acesneights1 · Feb 18, 2008

got a bad cold. Been up all night just waiting for the junkyard to open. Wish I new for sure if the ecms could be different.
Anybody ?:banghead:

acesneights1 · Feb 18, 2008

Junkyard sold it. I'm screwed.

Is a 1994 ECM same as a 1995 ? Anybody use Walts remans ?

acesneights1 · Feb 18, 2008

:help:
OK guys in Electrical forum got me a print for my truck but I'm asking here too because this is where the pros on old trucks are.
All 3 wires from T/S switch for the cruise tested good at respective ends at the ECM so I gotta believe the truck is wired for cruise and that I just either have a problem or somehow missed something ?? Still no word from Heath if the maxitorque may lack programming for it or would even affect it.
Now I'm stuck.
If I can figure this out alot of people will want to do this but I'm behind the times with the new stuff. What should I do next ?
Also one thing I didn't mention before. The ABS module is bad in the truck and light is on. Any chance that would affect it ?

AlbertaRedneck · Feb 18, 2008

As far as I know, a 94 without the 5068 pump should have an ECU that would work. 96 is definately OBD II. 95 and prior OBD I

Also, the ABS module might be causing the cruise not to work, as there is a code, a body or chassis code.

acesneights1 · Feb 18, 2008

If the 94 Had a 5068 pump but I swapped my Heath Maxitorque would it work then ?

benjammin · Feb 18, 2008

GM catalog says harness, PROM and PCM are the same with and without cruise for 1995 L56 apps in Tahoes.
Do you have your PCM part# ?

acesneights1 · Feb 18, 2008

Will this do ? Remember this is the one the guy put in form the junkyard. I don't have the original. The shop that did the job canned it. Truck has a 5521 Pump.Bill Heath said the BPAB means it was a 1 ton ambulance.

benjammin · Feb 19, 2008

That 16212488 has been superceded to 88963802, which is correct for your truck. It is only used in 1995MY trucks and vans, but for all the diesels, turbo or not.
I'd say go after the ABS issue and see what happens. Check your brake switch status also.

acesneights1 · Feb 19, 2008

No codes on the brake switch I rescanned both engine and abs. Abs has code 13(the expensive code). I wasn't going to ever fix it but maybe I should ask around because I know alot of people run with the ABS light on or fuse pulled maybe someone else can tell me if thier cruise was affected.
Otherwise I missed Bill Heaths call. Was going to ask if the maxitorque needed to be programmed for cruise but I don't think so. Just trying to cover everything. How would I know if Brake switch is bad other than a code ?

acesneights1 · Feb 20, 2008

OK I'm back to the drawing board. Spoke with Bill Heath today. He said the programming for the cruise is in the PCM itself not the Prom which I kinda figured but wanted to rule that out. By all rights I should have cruise. The only thing that remains is the fact that the ABS light is on and the module is bad. Would that cause the cruise not to work ? I couldn't find the ABS code lookup do we have one on DP ? I did search.:help:

acesneights1 · Mar 3, 2008

I got it.

OK I finally figured it out. It was the intermitent DTC 41 causing the cruise not to work. I replaced the brake switch and woohla I GOT CRUISE !!!
So basically any 94-95(Think it works on later as well judging by diagrams but can't say for sure) can have cruise control. All you need to do it change the multi function switch (Turnsignal lever) and put the fuse in the fuse block by drivers door and you will have cruise. What I have learned is that ABS codes or issues will not affect the cruise however any stored engine code will particulary DTC41. Apparently only part of my switch was burned out because my brake lights worked fine. Oddly enough the truck always felt like something was kicking in and out slightly on the highway but i always thought it was the A/C comp. I'll bet it was the TCC as this switch controls that too. Let me say this, if anybody knows the name and address of the A!HOLE engineer that designed the clip that holds the Brakelight switch please forward it to me so i can go to hs house and drive a rusty RR tie spike through his skull. What a POS. Needless to say I broke it and have the bloody knuckles to prove it. I used a small hose clamp to hold it on for tommorow till I can get another one. Really the moron that invented that clip should die a horrible death. I have pics and details in the beginning of this post as to dissasmbly of steering colum. The multifunction switch can be changed without pulling the steering wheel. This thread might even make a sticky ?? This only works on the 6.5s with PMD/DS4 so it's relevant. Couple guys sent me schematics and I want to say thanks to those who gave input. Anybody want cruise ?? It's that easy. I would say judging by the print for 96+ OBDII that this would work as well on those trucks but my 2000 already has cruise so I can't say for sure.

acesneights1 · Mar 3, 2008

Hey Mods can this thread be renamed "Cruise Control experiment a sucess" ? I don't know how to change the thread title.

knkreb · Mar 3, 2008

Done... then I had to ask my wife how to spell sucess and go back and change it after cut-and-paste

knkreb · Mar 3, 2008

Great info, I think this needs to make it's way in to the FAQ hall of fame for those wanting to try this.

Cruise Control experiment a success

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