Nanocom Fault Codes and Faults

[John_D4]

My new Nanocom arrived this afternoon and I was wondering if these numbers and codes and faults are ok -

D2 TD5 2000, 15p engine

ACE system: I’m getting a sound a bit like an over pressure valve release sound every 10 seconds, so I’m wondering if my ACE pressure valve is crook. Also developed a sudden leak at both fittings/ends of the ACE ram so again wondering if it’s over pressurising.

https://www.aulro.com/afvb/images/imported/2018/04/214.jpg

Auto Trans: these numbers mean nothing to me but one of them is markedly higher than the rest.

https://www.aulro.com/afvb/images/imported/2018/04/215.jpg

Auto Trans Fault Code: no real trans issues. It’s been serviced regularly in the last2 years that I’ve owned it. Only issue is when I tow my almost 2t camper and I give it full acceleration to pass a car the trans goes into limp mode and needs to be stopped, turn off the car and restart it. All then seems good.

https://www.aulro.com/afvb/images/imported/2018/04/216.jpg

[Tombie]

If your going in to limp mode you’re putting more into the transmission than it can handle..
Check your boost settings, you may need to drop 1/2 turn on the screw.

[John_D4]

This morning, towing the same camper, according to Nanocom I’m boosting 1.12-1.17 bar

Incidentally water temp rose to 94.2 before I ran out of hill

I’ve got a TRS remap

[Tombie]

That’s all good, but it’s the torque the box is seeing that’s throwing it into limp mode.
Went through all of this during the tuning phases on early TD5s.

The later Transmission module was a little more tolerant of higher torque but not much better...

[John_D4]

That’s all good, but it’s the torque the box is seeing that’s throwing it into limp mode.
Went through all of this during the tuning phases on early TD5s.

The later Transmission module was a little more tolerant of higher torque but not much better...

Thanks for your reply. So what now? Should I still wind the boost back, or review the TRS map in favour of a TD5 alive one

[discorevy]

Couple of ways to go
One is to change for a later TCU, and fill trans with synthetic oil on your next change ( worthwhile doing anyway)
Another is change down to third ( pulling 2 tonne would be a good idea to keep it there) and let the tc lock up before passing.
Don't drop your boost any further ( I'd increase it with a trs remap)

[John_D4]

Couple of ways to go
One is to change for a later TCU,
Don't drop your boost any further ( I'd increase it with a trs remap)

Do u mean ECU? What boost is a happy medium between performance and longevity?

[Tombie]

TCU is trans computer under passenger seat.

[DiscoDiscoMan]

Hi John, going up and down the SE freeway in my Td5 over Easter I tried using Sport mode and it reduced the amount of gear changes. Not sure but it may have a similar effect to locking it into gear.
So that may help? Can anyone shed some light on this? .... touch off topic...

[gavinwibrow]

Hi John, going up and down the SE freeway in my Td5 over Easter I tried using Sport mode and it reduced the amount of gear changes. Not sure but it may have a similar effect to locking it into gear.
So that may help? Can anyone shed some light on this? .... touch off topic...


I'm sure John would agree it is related.
Heavy towing always in 3rd with sports mode on, so I was told many years ago and have always applied. Go into D with a big load and watch the EGT (and coolant) temps rise, especially when your foot is down.

[steve_a]

I've never been able to made head nor tail of the shift speed values, I've seen all empty bar one, a few more filled in and mixes of stuff. Unless someone has a guide on them then I've consigned them to the non-informative, non-interesting area of nanocom.

[sierrafery]

For that P0721 see the MAF reading at your full boost and if it's well above 600 you better wind up the boost a bit IMO cos at so high MAF reading(if it's accurate) the rpm should be high too and you should get at least 1.3 bar, better 1.35 with well set wastegate... unless you have a slight boos leak... the EAT ECU considers that the engine speed is high enough at that point and prevents downshift to not create an engine overspeed so it sends it to limp mode... let's hope you dont have a slipping clutch in the box or something... if this happens with fresh oil and filter too maybe you should run a stall test on the box... i helped a friend with this fault code once and the problem was that the aftermarket crank sensor he fitted gave higher than normal reading, took ages to figure this out but IMO that's not something common

from ZF4HP22EH troubleshooting manual
https://www.aulro.com/afvb/images/imported/2018/04/279.jpg

here are the ambient conditions too as to help in the troubleshooting

https://www.aulro.com/afvb/images/imported/2018/04/281.jpg

[John_D4]

Thanks Sierrafery. I had to read your post 2 or 3 times for it to make sense. I get it now. That would certainly explain the limp home mode.

Sounds like 1st check is to run it up the expressway Hill at full boost and make note of boost pressure and MAF reading (probably coolant also while I’m there). I might do that and report back before I fiddle with the turbo. I have never done that before so I’d rather make sure I’m understanding things before I adjust.

I’m kinda hoping that that will ‘fix’ the issue. Although it is a LR...nothing is ever that simple!