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Offline cj7ox

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Re: LML Duramax build part 6
« Reply #200 on: August 14, 2019, 02:53:27 AM »
It’s the ‘tuck... he’s probably rolling around on the lawn mower.


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Offline dave945

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Re: LML Duramax build part 6
« Reply #201 on: August 14, 2019, 03:07:48 AM »
You have to remember, things are different in the Tuck. Yeah, it’s a “lawn mower”, but it’s not California CARB compliant.

I saw don on his way to the store.



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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #202 on: August 14, 2019, 08:51:30 AM »
I like that ^^^^^^

Naw no jeep for you, sez the wife!

I'm walking, that's about it.

No place I really need to get to, would have liked to been down at the farm to knock out that pond though.

It's all good. No one is shooting at me, no dogs blowing up anywhere, no R2D2 units moving about...I'm good
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Offline Bigdave_185

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Re: LML Duramax build part 6
« Reply #203 on: August 14, 2019, 09:15:37 AM »
Where is the two wheel machine?


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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #204 on: August 14, 2019, 09:16:23 AM »
He quietly disposed of those last year.


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Offline KensAuto

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Re: LML Duramax build part 6
« Reply #205 on: August 14, 2019, 10:02:00 AM »
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Offline Sammconn

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Re: LML Duramax build part 6
« Reply #206 on: August 14, 2019, 03:50:59 PM »
 :popcorn:

Those are awesome!
I just don't want to wind up missing a digit or limb.  I can sometimes get in a hurry to get results.
Sam

Offline Flyin6

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Re: LML Duramax build part 6
« Reply #207 on: August 16, 2019, 04:45:18 PM »
I got the internal transmission harness in today from "Dirty Hooker Diesel" in MI.

Planning to install it today, I took off in the truck to pick up the requisite 3 gallons of Dexi VI.

I didn't get very far, like two miles when it dropped into limp mode. Trans was shifting perfectly, no slipping, and trans temp remained very low at 124F

So. plan B is to have the wife pick up some fluid on her way home from work. But, we have a football game to attend tonight and another 70 miles away tomorrow (Read: half a day or more). So Not too sure when I can get to it.

Codes this time:
P0700 something wrong with transmission
P0708 TCM or related problem such as wiring
P0673 #3 glow plug
P150C - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect 0 Comments  |  Add Comment       Possible causes Faulty Transmission Control Module (TCM) Transmission Control Module (TCM) harness is open or shorted Transmission Control Module (TCM) circuit poor electrical connection

« Last Edit: August 16, 2019, 04:47:48 PM by Flyin6 »
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Offline stlaser

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Re: LML Duramax build part 6
« Reply #208 on: August 16, 2019, 06:03:01 PM »
I got the internal transmission harness in today from "Dirty Hooker Diesel" in MI.

Planning to install it today, I took off in the truck to pick up the requisite 3 gallons of Dexi VI.

I didn't get very far, like two miles when it dropped into limp mode. Trans was shifting perfectly, no slipping, and trans temp remained very low at 124F

So. plan B is to have the wife pick up some fluid on her way home from work. But, we have a football game to attend tonight and another 70 miles away tomorrow (Read: half a day or more). So Not too sure when I can get to it.

Codes this time:
P0700 something wrong with transmission
P0708 TCM or related problem such as wiring
P0673 #3 glow plug
P150C - Transmission Control Module Engine Speed Request Signal Message Counter Incorrect 0 Comments  |  Add Comment       Possible causes Faulty Transmission Control Module (TCM) Transmission Control Module (TCM) harness is open or shorted Transmission Control Module (TCM) circuit poor electrical connection

Careful with that language “dirty hooker” a guy Dave will be here shortly and no telling what response he will have.....  :evil:
Living in the remote north hoping Ken doesn’t bring H up here any time soon…..

Offline dave945

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Re: LML Duramax build part 6
« Reply #209 on: August 16, 2019, 09:34:08 PM »
Did somebody say “dirty hooker”?  Oh, you’re looking for the other Dave. ;)


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Offline KensAuto

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Re: LML Duramax build part 6
« Reply #210 on: August 16, 2019, 09:45:52 PM »
I checked Identifix to see what guys were doing to fix the p0708 code and most are replacing the TCM. ..but some are finding fluid or corrosion in the trans connector, bad internal harness, internal mode switch, and a few with external harness rubbing issues.
There's a tsb on the harness rubbing the left upper a-arm and/or the intercooler pipe near there (see pic). One guy had it rubbing farther back by the cab mount. Some had corroded or loose connectors above... where the trans harness hooks into main harness (by a/c compressor I think).
The p150c code usually causes a no start according to what I read (camshaft sensor) so to see those unrelated codes together makes me think there's a harness issue up top somewhere.

Second pic is just what guys found with only the p0708 code.
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Offline Bigdave_185

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Re: LML Duramax build part 6
« Reply #211 on: August 16, 2019, 09:47:18 PM »
I would never jump to any conclusions or say anything with out couth

Not sure what other Dave you might be thinking of


Besides I have overwatch on everything I post


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Offline KensAuto

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Re: LML Duramax build part 6
« Reply #212 on: August 16, 2019, 09:50:46 PM »
On every recommended test for that code, the tech mentioned that the harness often rubs through on the bellhousing area but I didn't see where a single shop found that issue.
Test #1:
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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #213 on: August 16, 2019, 09:51:12 PM »
Did you already replace the TCM Don?


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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #214 on: August 17, 2019, 11:55:23 AM »
Thanks Ken

Note: So good to have knowledgeable veterans of stuff on here! I am really appreciative!!

Tex: No, I have not replaced the TCM, but I may, depending on what happens today, the internal harness replacement day.

It is sitting here in reserve. From my research the bulk of the wiring problems seems to be #1: the internal harness has failed in some way
#2: the pins have become corroded at the connector to the TCM.

I think we can just assume the internal harness is either bad or at its life time limits, so replacing that just seems to make sense. Another side benefit is that the trans will get a good flush. I already drained and replaced 3 gal of fluid, and am about to do it again. That means most of the fluid remaining trapped in the torque converter during change one will be highly diluted and when I drain it again will nearly constitute a complete fluid change.

So on to the ever expanding oil slick that I am about to recreate!
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Offline swbhobie16

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Re: LML Duramax build part 6
« Reply #215 on: August 17, 2019, 12:38:07 PM »
so what is the exact fluid required for the allison 1000s? i saw you said dex VI but i thought it was trans synd? the actual allison fluid..?

Offline Flyin6

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Re: LML Duramax build part 6
« Reply #216 on: August 17, 2019, 01:20:31 PM »
so what is the exact fluid required for the allison 1000s? i saw you said dex VI but i thought it was trans synd? the actual allison fluid..?
Transyn, the Allison produced fluid is the stuff Allison produces and is more or less the same as Dexi VI. The Allison transmission as delivered in GM applications is filled with Dexi VI from the factory.
People who change over to Trans Syn are fine and that is arguably the very best fluid there is for this trans, however only by the tinny weeniest margin if at all.

I read a great write-up on the Dexi-6. Before Dex-6 any fluid meeting the lubrication specification of say, dex-3 could be labeled/marketed/sold as Dex-3. However with the advent of Dex6, which is synthetic, Gm mandates that the chemistry has to be identical, not just the performance parameters. This makes all Dex-6 essentially the same, with the same exact DNA. That is very interesting because it means that if I were to purchase the O'Reillys Dex-6 for $27 a gallon, it is chemically the exact same as the spendy valvoline Dex-6 for $60 a gallon...No difference. Whereas before buying a premium Dex-3 or Merc or whatever meant you were purchasing premium oil base stock and the best additives. Now it's all the same.

Trans-syn is not Dex-6, but what Allison uses in fleet other than GM trans servicing. It doesn't perform any longer, to any higher temp, resist corrosion or taste any different than the Dex-6 stuff

Save your $$$...
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Offline rpar86

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Re: LML Duramax build part 6
« Reply #217 on: August 17, 2019, 02:12:24 PM »
...will nearly constitute a complete fluid change.


Uh oh. Here we go.



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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #218 on: August 17, 2019, 07:14:56 PM »
I still say TCM. Thousands of trucks with 20 plus years on the same wiring harness.


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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #219 on: August 17, 2019, 08:00:29 PM »
I still say TCM. Thousands of trucks with 20 plus years on the same wiring harness.


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And thousands of them with the harnesses having been replaced

Its academic

At the moment it is replaced, although I had a misalignment on the shift valve pin and need to pull the valve body out again...in the morning...
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Offline Bigdave_185

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Re: LML Duramax build part 6
« Reply #220 on: August 17, 2019, 08:04:53 PM »
Sell it!! Buy a ford!


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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #221 on: August 17, 2019, 08:12:04 PM »
Don. Friendly wager?

If it’s not the TCM I’ll donate $100 to the RMTW website fund 

If it is...I’ll buy the steaks at the fall get together at the farm.


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Offline wyorunner

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Re: LML Duramax build part 6
« Reply #222 on: August 17, 2019, 08:55:37 PM »
Don. Friendly wager?

If it’s not the TCM I’ll donate $100 to the RMTW website fund 

If it is...I’ll buy the steaks at the fall get together at the farm.


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Heck of a wager!  What is this fall get together you speak of? We’re headed that direction-ish next month.

Offline Flyin6

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Re: LML Duramax build part 6
« Reply #223 on: August 18, 2019, 12:12:56 PM »
Don. Friendly wager?

If it’s not the TCM I’ll donate $100 to the RMTW website fund 

If it is...I’ll buy the steaks at the fall get together at the farm.


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;-)

We're about to find out. Pouring the new fluid in in a few minutes.

But, the old harness was defective!

Ha!

Had trans fluid seeping out into the pins and loom outside the trans. I'll post up pics after I test drive it.
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #224 on: August 18, 2019, 12:18:28 PM »
Don. Friendly wager?

If it’s not the TCM I’ll donate $100 to the RMTW website fund 

If it is...I’ll buy the steaks at the fall get together at the farm.


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Heck of a wager!  What is this fall get together you speak of? We’re headed that direction-ish next month.
Tex, and well, just about everyone (including mee) wants to do a real man get together someday at my farm.

I dream of the day we do that. It's about ready...bit messy, but will serve as a rural gatherin' place for men to meet, fellowship, pray, share, have fun, eat, shoot, run some heavy equipment.

And when we do this, everyone gets to cut up some log on the saw mill of a tree from my place and take it home.
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Offline swbhobie16

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Re: LML Duramax build part 6
« Reply #225 on: August 18, 2019, 12:44:37 PM »
you had me at running a sawmill..

Offline Nate

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Re: LML Duramax build part 6
« Reply #226 on: August 18, 2019, 01:04:52 PM »
My fees for running your heavy equipment for you are a bit steep....lol
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Offline dave945

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Re: LML Duramax build part 6
« Reply #227 on: August 18, 2019, 01:07:11 PM »
Sounds like fun.  What do we get to run over when operating said machinery?  Do we need to bring our own cameras and chainsaws?


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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #228 on: August 18, 2019, 01:08:32 PM »
Sounds like fun.  What do we get to run over when operating said machinery?  Do we need to bring our own cameras and chainsaws?


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Funny guy...
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #229 on: August 18, 2019, 02:49:28 PM »
OK, continuing, and I have a lot of information in this post

Here is the Allison transmission electrical harness bulkhead connection

You may take note of the orange color at the bottom
« Last Edit: August 18, 2019, 02:50:07 PM by Flyin6 »
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #230 on: August 18, 2019, 02:52:25 PM »
The inside of the connector shows that fluid has been seeping out through the wiring into the connector. This is evidence of a failure of the harness at this point to contain fluid. Now whether or not that will affect electrical operation is in question
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #231 on: August 18, 2019, 02:54:03 PM »
So, the exercise here today is to replace the internal Allison wiring harness. There are lots of problems with these apparently with them shorting and becoming brittle.

The pan off again with the harness exposed
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #232 on: August 18, 2019, 02:54:59 PM »
And here is the new GM replacement harness
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #233 on: August 18, 2019, 02:57:04 PM »
The harness is disconnected in this shot, but to remove it, you must first drop the valve body.

Now do some research on this topic, as you do not have to remove all of those 8mm bolts. Six in the back, five in the right front, and four in the left front
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #234 on: August 18, 2019, 02:58:29 PM »
The oil, the valve body, the internal surfaces, even the case is very clean. This is after 105,000 miles and quite a bit of towing
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #235 on: August 18, 2019, 02:59:57 PM »
Here is a side by side of old and new, and the new harness bulkhead fitting just installed
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #236 on: August 18, 2019, 03:03:36 PM »
Harness is plugged up

I had installed the valve body without first making sure the gear selector valve guide pin was slid into the slot in the shift mechanism.

That caused me to have to take everything apart a second time when i discovered the shifter didn't work
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #237 on: August 18, 2019, 03:04:35 PM »
And for archival reasons, here are closeups of the old harness part numbers
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #238 on: August 18, 2019, 03:06:45 PM »
And here is the second time I removed the valve body to closely inspect it to determine if my mis-install damaged anything. I dodged a big one, it was just fine

Pics showing that gear selector valve pin that needs to engage the mechanical shift internal linkage
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #239 on: August 18, 2019, 03:17:55 PM »
I saved the fluid that I drained which was new and poured it back in, checked operating levels, then took off on a test drive.

That test drive lasted about 15 feet out of the garage when I got a shift inhibited message, a flashing line under the gear I selected and zero movement.

Seems I am not done with all this

So I pulled the codes and whoa! Got a bunch of them.

They seem to point to something master and electrical, and controlling...something like either a bar wiring harness or bad TCM

Here's what I got:

0658  Actuator voltage "A" circuit low

0701  Trans system control range/performance

0708  Trans range sensor "A" circuit high

0712  Trans fluid temp sensor "A" circuit low

0716  Input turbine speed sensor "A" circuit range/performance

071A  Trans mode switch "A" circuit

0757  Shift solenoid "B" stuck on

0842  Trans fluid pressure sensor/switch "A" circuit low

0847  Trans fluid pressure sensor/switch "B" circuit low

0872  Trans fluid pressure sensor/switch "C" circuit low

0877  Trans fluid pressure sensor/switch "D" circuit low

2669  Actuator supply voltage "B" circuit open

2670  Actuator supply voltage "B" circuit low
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #240 on: August 18, 2019, 03:18:35 PM »
The next step???

Replace the TCM

We'll see if you're right, Tex
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #241 on: August 18, 2019, 03:20:05 PM »
Oh and when I cleared the DTC's with the engine idling, it jumped into high idle mode then starting skipping every once in awhile. The dash beneath the gear I selected started flashing and I got a "Shift inhibited" message again.
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Offline KensAuto

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Re: LML Duramax build part 6
« Reply #242 on: August 18, 2019, 05:23:19 PM »
Don, not questioning your ability, but you sure you got that main connector snapped all the way together? Weird you would end up with that many codes after the repair, unless you have a bad wire in the area of the connection. I would pull on each wire to see if any feel stretchy.
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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #243 on: August 18, 2019, 05:46:22 PM »
As much as I would like to be right, I’m with Ken.  Too much all at once.  Has to be something amiss with the harness job.


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Offline JR

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Re: LML Duramax build part 6
« Reply #244 on: August 18, 2019, 06:05:44 PM »
Try disconnecting the battery for a few minutes or did you?

So maybe the harness was OK but leaking a little and the TCM was bad all along? But why all the new codes now?
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #245 on: August 18, 2019, 06:29:09 PM »
Don, not questioning your ability, but you sure you got that main connector snapped all the way together? Weird you would end up with that many codes after the repair, unless you have a bad wire in the area of the connection. I would pull on each wire to see if any feel stretchy.
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If you have a good point to make, please make it

So, yes, I got a good solid push/stop when I connected the two. I could give it another push to see, though.

This is what it looked like when i first started this adventure. The codes were endless and all over the place, like everything was going wrong all at the same time.

Think TCM change is warranted?
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Offline JR

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Re: LML Duramax build part 6
« Reply #246 on: August 18, 2019, 08:22:40 PM »
New harness, same codes seems to point to the TCM or another harness.
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #247 on: August 18, 2019, 08:28:18 PM »
OK, so I crawled under it and checked the transmission connection. It felt to be tight

I shoved it in some just to be sure and slid back the electrical tape. The wires in that bundle seem to be all fused together. Not melted but as if they were glued together from the manufacturer. The cable was gooey with dissolved tape adhesive and transmission fluid.

Afterward I took it on what turned out to be a nearly 30 min test drive. Everything seemed completely normal and no CEL. Then after coming to a stop and acclerating onto a road, the transmission would not upshift out of 1st. So I drove it a short distance, pulled off the road and shifted to neutral. I noted trans temp to be 184F. Shifting back into drive the CEL illuminated and the trans went into limp mode (Thank Heaven!) and so I drove it home that way. Along the way the speedometer began to jump about around 10-15 mph fluctuations and the trans temp turned into just dashed lines.

Before I got home the speedo settled down and the trans showed temp again in the mid 190's.

It threw codes:

0700 which is a TCM command to the ECM to show a code which illuminated the CEL

0708  Trans Range sensor "A" circuit high.

TCM?? Bad wiring?? Speed sensor??
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Offline Flyin6

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Re: LML Duramax build part 6
« Reply #248 on: August 18, 2019, 08:29:30 PM »
New harness, same codes seems to point to the TCM or another harness.
Ya, maybe...I have a TCM, just cost me $150 to have it flashed...
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Offline TexasRedNeck

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Re: LML Duramax build part 6
« Reply #249 on: August 18, 2019, 08:31:00 PM »
When my speed sensor went bad it would not come out of first gear


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