E5Farmer

44 minutes ago, Joey Mack said:

so true 'F'...  I did a few clutches and lots of programming, but nothing internally. i have had the shift covers off a few times and saw the importance of lifting it 'Straight up'  because of the tone wheels for the speed sensors...  very delicate..  well, I will just watch and hopefully learn from this thread...   Jojo

Well I was hoping it to be something I could do myself.  After catching up on the thread it looks like I might have to bring it in.  

On 3/10/2022 at 5:35 PM, Onyx610 said:

It’s controlled by air, I believe there is a ribbon wire in the tscm that is know for problems and gets replaced. 

Interesting.  So dumb question, What part should I look into replacing or testing?  The TSCM?  I apologize I’m not much of a mechanic but thank you for the help.  

38 minutes ago, Joey Mack said:

yeah, it sucks in a way.... the last year I was working there, we had one come through, and I fixed it, 14 litre Series 60. I did the front cover.  While doing the work ,I found the EGR was capped off... It was a clean looking delete.  I was told to get this truck back together and out of here, then got my ears filled up with the rules about deleted truck's...  jojo

YUP!  I was told dealers do not like to work on them.  Luckily i have a couple local shops that don’t care.  

32 minutes ago, Onyx610 said:

Wonder if your clutch is engaging and disengaging quickly when in park. 

That sounds like a good possibility.  Would that be a computer fix you think?  Or clutch job?

42 minutes ago, Onyx610 said:

Ok, so we can eliminate that it’s not something new and that it didn’t have anything to do with the delete….Do you know the person that you bought it from? If not maybe someone sold it for this reason? 

I cannot say it is something from the delete or not as it was deleted when i bought it was doing this since i brought it home.  It could possibly be the reason he sold it.  But what i was told is they were going away from automatic trucks on their farm.  This issue could very well be the reason.  I’m guessing its fixable, just getting to that point!  Thanks 

5 hours ago, Onyx610 said:

I feel like the deleted automatic trucks especially with the already problematic mdrive have a lot more room for error without spot on delete software. There is alot of talking between the ecm, acm, and tcm. 

Yes i would agree.  The truck runs fine 99% of the time so I’m not going to be spending big $ bringing it to a dealer or anything.  Just every now and then it does this.  I figured I’d try figure it out during the off season.  

5 hours ago, Onyx610 said:

These typically don’t work out well. However tcm software like Joey said is a good place to start. How long have you had the truck and did this problem just start?

I have only owned the truck for a couple months and it was deleted when i purchased it, its been doing it since day one.  I originally thought it idled too low.

3 hours ago, Joey Mack said:

what are the most recent repairs that were done?  were any updates done to the TCM? 

The truck is deleted if that answers the question.  It’s a new to me truck

2 hours ago, fjh said:

I have a suggestion ! take part and clean the EGR DPF ports and tubes make sure all is clear! that surging you hear may be the EGR valve tryng to find its sweet spot and restricted tubes can make it slow to respond!

 

Just something to try!

Thank you.  The truck is deleted

18 minutes ago, Joey Mack said:

I need to think on this one, my knowledge on this truck is dwindling.  however, there should be some really smart guys on the way to help.. jojo

Thank you.  I wish i could upload the video so guys could see and hear it.  

10 hours ago, Joey Mack said:

Hmm??   I am curious... M-Drive tranny?   jojo

Yessir

New to me 2012 CXU Mdrive with MP7.  Truck starts, runs, drives fine.  But when ever I come to a stop and set park brake it’ll start “surging” or “erratically idle” going from 600 to 700rpm.  It does eventually work out if it.  It will be idling at 650, set the park brake then immediately goes under load or bogs down to about 600 for maybe 1/4-1/2 second then let’s go and idles up to 700 then the process just continues, bogs down to 600 then “let’s go” and surges to 700 over and over. I tried disconnecting the throttle potentiometer behind the pedal but it continued.  It does seem like it only does it after the truck is warmed up.  

I do have a video but it is too big to upload to here.  
 

thank you 

12 CXU613. Problem, cannot control temperature of air coming out of vents in cab(always hot).  Also cannot control the mode (vent, defrost, feet,etc…) I can control the fan speed itself.  

I have replaced the control unit itself, I put in a new actuator in the dash, neither have fixed it.  The relay in fuse panel on the dash has power.  I am not familiar with wiring of these trucks but I’m assuming if it was a fuse I’d lose all control including fan speed, Not just temp and mode.  
Any and all suggestions appreciated!
thank you

I have a similar problem.  Cannot control the temperature or modes.  Replaced the control unit.  Have actuators but I’m wondering if it could be the resistor?  

12 hours ago, Mackpro said:

I bought lots and lots of the Factory manuals over the years when I was at the dealership. Most were $8-$15 a piece. I have this one in print so I knew what it looked like and just did a quick search and it turned up. The Mack E-Media site is free but I think it’s mostly Service Bulletins now, it used to be full of manuals. Also the Mack Body Builder website has lots of free maintenance info that’s way easier to navigate than the dealership website. In related info RH Sheppard and TRW both have all their steering gear manuals free online. Eaton Fuller has all their transmission manuals online as well . Bendix also has lots of free manuals on ABS/brakes. 

Thank you for the information

12 hours ago, Mackpro said:

I bought lots and lots of the Factory manuals over the years when I was at the dealership. Most were $8-$15 a piece. I have this one in print so I knew what it looked like and just did a quick search and it turned up. The Mack E-Media site is free but I think it’s mostly Service Bulletins now, it used to be full of manuals. Also the Mack Body Builder website has lots of free maintenance info that’s way easier to navigate than the dealership website. In related info RH Sheppard and TRW both have all their steering gear manuals free online. Eaton Fuller has all their transmission manuals online as well . Bendix also has lots of free manuals on ABS/brakes. 

8 hours ago, Joey Mack said:

here are the fuse legend's...  A little hard to read, my hands were dirty when i made these copies in a hurry... jojo

I saved all of these. Thank you very much!

23 hours ago, Mackpro said:

Here is a link to the factory manual for several different HVAC models, make sure you use the correct model . https://s6dc2dc82dd3d959c.jimcontent.com/download/version/1549531542/module/8252074015/name/Air Conditioning System Service Manual. Includes US 07 Mack Chassis%2C GU (Granite Series)%2C CHU AND CXU (Pinnacle Series)%2C MRU AND LEU (Terra Pro Series).pdf

Where do you find online manuals like this?

22 hours ago, Mackpro said:

Here is a link to the factory manual for several different HVAC models, make sure you use the correct model . https://s6dc2dc82dd3d959c.jimcontent.com/download/version/1549531542/module/8252074015/name/Air Conditioning System Service Manual. Includes US 07 Mack Chassis%2C GU (Granite Series)%2C CHU AND CXU (Pinnacle Series)%2C MRU AND LEU (Terra Pro Series).pdf

Thank you.  That looks like good information 

I am wondering if power only comes in on the fan control side?  Maybe it is my controller that is bad?  I cannot seem to find a wiring diagram on this thing. Mack seems to keep things locked down tight.  (First Mack truck for me)

New to me 2012 CXU613.  MP7.  Both my cab temp and mode(vent/defrost) controls are not working.  Fan control works as it should. Just always blows HOT air from the vents.  I was told actuators buried in passenger side dash.  But the temp actuator has been on back order for months.  I raise an eyebrow when BOTH of them are not working.  I checked fuses on top of the dash and fuses underneath by brake pedal. (Don’t have fuse diagram, checked all of them).  All are good.  
It looks like their is a harness going to fan control and one opposite for mode/temp control?   If I turn key to on position I cannot get any constant power from any of the terminals out of the wiring harness.  
Go ahead and replace all the actuators like was suggested?  Or can you think of something else?  Any thoughts are appreciated.