Thread: P1884 Fault Code

I am no help but I’ve cleared that fault twice in the last 6 months as the wagon doesn’t show any misbehaviour I just ignore it.
My auto was throwing up P0705 , I think I have fixed that by cleaning the oily red plug.

I had a bit of a look about the net and found this:

Fault Description CARB Ambient 1 Ambient 2 Ambient 3
33 CAN message MD_IND invalid, indicated by F_TL_MES P1884 N_MOT VGT_$X MMM
The CAN message from the engine management controller which informs the transmission of the engine torque is invalid.
Diagnostic operates: Continuously
Conditions to be met to run Diagnostic: None
Time between fault present & fault stored: 10 ms
Variables used by the diagnostic: CAN message F_TL_MES
Will limp home mode be selected: No
Conditions to be met to clear the fault: Ignition to be switched on whilst fault not present, engine cranked.

Engine torque invalid?
Did you accelerate hard at some point prior?

The P1884 part seems to be less relevant than the F_TL_MES part of the fault code.
P1884 can be several other elements in the power train .. such as MAF or whatever.

Note that this info is courtesy of a Range Rover version of the same trans(electronic), so the assumption is that they maintained the same codes.

That still makes me wonder if my engine MAP is a bit off.

Do you have an EGT gauge?
If so, what kind of temps do you get ... ie. worst case?

my brothers is a TRS, too. Came with car. Sticker found on ECU.

From what I've read(mainly here) TRS can be notorious for producing high EGTs out of their re-mapping.

I dunno much about D2s and TD5s and mapping, other than what I read.
So with that, I understand that the power train can't give the ECU any numbers on actual power/torque, but the ECU may estimate how much.
If too much torque(is estimated), then the ECU adapts in some way. eg. if too much boost(which usually equates to more power) is sensed, then we all know the ECU will manage fuelling.

You probably didn't get overboost, or you'd know it .. but I reckon something similar happened and you just got a logged fault. Fault is probably not the most accurate word for it tho .. more of a logged event.
No idea what'd happen if it occurred too many times, but it will clear itself if the event doesn't repeat.

If you read the description of why it'd happen .. it says the ECU informs the trans of engine torque invalid(whatever that means) .. does it mean too little, or too much?
Either way, I'm thinking if you press the accelerator, the ECU is programmed to sort of know what to expect in terms of power/torque.
it sends data to trans ECU to tell it how to shift .. or something ... keeps right gear, shifts smooth .. dunno really, just guessing.

With brothers TD5(with TRS map) it feels fine, other than he still doesn't understand the importance value of an EGT gauge.
Don't really see a lot of black smoke, so I'm assuming it's not running excessive EGTs under load, so I'd say from what I've experienced of the TRS map .. not bad.

Are you having any drive issues like hesitation or power loss, or anything like that?

Originally Posted by John_D2

Any ideas what this nanocom fault for my D2 TD5 auto is? It relates to the auto trans. I have a TRS remap that I’m not sure if it’s quite ‘right’. Going to get a fellow Forumite to check my existing MAP for me soon.

There seems to be a number of reasons why that error shows up, from poor battery condition too who knows what...

I wouldn't stress too much unless it becomes permanent, I think it's basically communications issues between the engine ecu and the auto ecu, I think even turning the engine off and then on again too quickly can trigger it.

Cheers

Originally Posted by AK83

Do you have an EGT gauge?
If so, what kind of temps do you get ... ie. worst case?

my brothers is a TRS, too. Came with car. Sticker found on ECU.

From what I've read(mainly here) TRS can be notorious for producing high EGTs out of their re-mapping.

I dunno much about D2s and TD5s and mapping, other than what I read.
So with that, I understand that the power train can't give the ECU any numbers on actual power/torque, but the ECU may estimate how much.
If too much torque(is estimated), then the ECU adapts in some way. eg. if too much boost(which usually equates to more power) is sensed, then we all know the ECU will manage fuelling.

You probably didn't get overboost, or you'd know it .. but I reckon something similar happened and you just got a logged fault. Fault is probably not the most accurate word for it tho .. more of a logged event.
No idea what'd happen if it occurred too many times, but it will clear itself if the event doesn't repeat.

If you read the description of why it'd happen .. it says the ECU informs the trans of engine torque invalid(whatever that means) .. does it mean too little, or too much?
Either way, I'm thinking if you press the accelerator, the ECU is programmed to sort of know what to expect in terms of power/torque.
it sends data to trans ECU to tell it how to shift .. or something ... keeps right gear, shifts smooth .. dunno really, just guessing.

With brothers TD5(with TRS map) it feels fine, other than he still doesn't understand the importance value of an EGT gauge.
Don't really see a lot of black smoke, so I'm assuming it's not running excessive EGTs under load, so I'd say from what I've experienced of the TRS map .. not bad.

Are you having any drive issues like hesitation or power loss, or anything like that?

I'm not affiliated in any way with trs, but I've seen plenty of their remaps , both msb and nnn , all stage one,and am yet to see any hard evidence to suggest that any egt problems come from the remaps they do,

If anytime can provide evidence I will result accept...
A stage two remap on the other hand would definitely need egt monitored as it wouldn't be too difficult to have issues then,
i.e. You would need to drive on the egt gauge when towing or giving it a full boot for any length of time, up serious hills etc.
Cheers
James

Originally Posted by shack

There seems to be a number of reasons why that error shows up, from poor battery condition too who knows what...

I wouldn't stress too much unless it becomes permanent, I think it's basically communications issues between the engine ecu and the auto ecu, I think even turning the engine off and then on again too quickly can trigger it.

Cheers

Fair points. To be honest I’m not too stressed because the auto gear changes are perfectly fine and I service it regularly. The oil always comes out fine too. I am really interested why it happens, but it could be a dirty plug on a sensor. The other day it was idling roughly. Turned out the plug under the fuel cooler was dirty. I squirted it with electrical contacts cleaner and blew it with compressed air and alls fine again.

To answer a couple of posts above. I have an EGT gauge. Even without towing I can easily hit 750 degrees up a moderate hill - let alone climbing the expressway or southeastern freeway hills out of Adelaide or loaded. It’s not overboosting. I’ve had that previously & it turned out to b either the MAP or MAF sensors. I played around with the wastegate rod until it’s now boosting a hair under 1.3 bar.

I’ve got a AlliSport intercooler coming on Friday. I don’t know if it is the remap or not, but it will go into limp mode if I use full throttle. TD5 inside website states that this can happen if you are getting more than 160hp. I’m pretty sure I’m not.