HDC and TC lights only (not ABS) staying on after BCU/ECU/IDM change

[ozscott]

Hi all,

BCU, ECU and IDM all changed due to no start. Now runs like a dream, but TC AND HDC error lights staying on and ABS Amigo is not clearing. I sense it will not be a co-incidental ABS fault...

Does the D2 have a switch on the steering column like the F1 - could it be this problem?

http://www.aulro.com/afvb/freelander-1/187748-two-amigos.html

Cheers and thanks

[sierrafery]

No, nothing like that, the TC + HDC without ABS according to the official diagnostic protocol is "Engine data = Sticking throttle, signal failure, data corruption" (3'rd in the attached list) which should be stored as fault code BUT in reality i've seen cases when these warnings were on without any code stored but intermittent and in this case you'll have to drive it hard and brake alot untill the ABS comes on too then you'll get a fault code usually a sensor related one also.

[ozscott]

Many thanks mate. The odd thing is that if it be engine management related the HDC is not working. But if i understand it correctly you think it might be ABS related? I will attach my ultra guage and see if any codes. It did not have the warning lights nor codes before the no-start issue...

Cheers

[Pedro_The_Swift]

I do wonder how D3/4's could be any more complex in their mechanical safety interlocks,,
I think the car thought there was a safety problem,,
and stopped the car.

sounds good!:D

[ozscott]

What is annoying me is that a Testbook equivalent was hooked up on it and pronounced all OK after the programming saw it start up....

[ozscott]

Ok gauge on and it's throwing a 0600 code which I understand to mean a missing signal from the transmission control module (which perhaps mine does not have because it's an auto)...so because my ECU and BCU and IDM came from an automatic it logs an error...if that be the case the question is whether the BCU can be reprogrammed to instruct it that the vehicle is a manual transmission...

It might also explain why HDC is not able to be engaged because it needs to know what the trans is doing.

Cheers

[sierrafery]

Yes, deffinitely the BCU must be set for manual transmission if it wasn't already cos it should throw flashing M+S if it was on auto setting but IMO that automatic engine ECU will still miss that CAN signal and missing that it gives corrupted data to the SLABS that's the reason for TC/HDC warnings, was the ABS ECU scanned too...if there is a current fault present the ABS AMIGO can't clear it, do somehow to read the fault code stored in the ABS...and if no code wait untill the 3 amigos will be complete and read then... the HDC or TC will not work as long as the warnings are on and the ABS is in a default mode with reduced deceleration threshold too

i know too little about the V8 engine management but IMO an automatic ECU should be remapped for manual as to not expect that CAN message from the autobox ECU which is not there

[ozscott]

This might be a problem...lack of resistors in the auto ECU for clutch pedal recognition...re HDC feeds...

http://www.aulro.com/afvb/discovery-2/169913-differences-between-manual-auto-td5-ecus.html

Cheers

[sierrafery]

Something like that though in the linked thread it's about Td5 and the V8 ECU is way too different but the clutch switch input is also needed that's a fact... as the BCU is set to manual this info is shared with the SLABS too then the SLABS doesnt get the expected specific manual inputs from the automatic ECU and it throws that "corrupted data" fault code which brings up the HDC/TC warnings when HDC is disabled, IMO better get hold of a manual ECU

[ozscott]

Thanks again Sierra. I think i will put my ECU back in....i dont think it was at fault for the no start issue anyway.

Cheer

[sierrafery]

Just be aware that if the BCU was replaced you'll have to make your ECU learn the security code

[ozscott]

Thanks mate. I wonder if I should use the opportunity to ship my manual ECU (which is sitting in pride of place on the passenger seat) over to Tornado and have Mark Adams install a new program via a new chip set to better suit the 4.6 high comp motor - albiet with a stock slightly smaller diameter MAF).

Pedro, did you end up doing the 4.6 NAS MAF or are you happy with the stock inlet pipe and MAF combined with the re-chipped ECU from Mark? Is it worth doing the chip without the MAF and pipe?

Cheers

[Pedro_The_Swift]

YES!!

to both,,
(how did you know?? :p)
Last Friday finally had the OZ 4.6RR Thor airbox lid and MAF installed. Its too early yet for me to pick an improvement between 4L and 4.6L mafs,,
But you WILL see a huge difference just using the 4.6 Tornado,, makes it all worth while:D;):cool:

[ozscott]

Pedro did yours have an acceleration flat spot before the new ECU...Mark talks of a common one.

Cheers

[ozscott]

Ok my Corrosion X covered ECU and BCU back in and lights off, no codes and she works again. Flashing Odo so it needs to be told to accept Odo value i think.

Jeez the 4.6 is a nice strong motor. If anyone is wondering just do it.

I have decided not to do the Tornado Chip. It has zero flat spot and revs clean amd hard right to redline.

Cheers

[sierrafery]

For the flashing odometer ONLY DISABLE THE ODOMETER WARNING IN THE BCU settings do not select "sync BCU to odometer" or vice-versa cos you might end up with a higher mileage on dash

[Pedro_The_Swift]

Jeez the 4.6 is a nice strong motor. If anyone is wondering just do it.


Cheers

we should line them up:angel::angel::angel:

[manaranjoh]

I was with the same problem a long time, many TC and pending descent lit sporadically. The solution is very simple, change the brake stop light switch. It seems impossible but it WORKS! If you are handy, it will be enough to disassemble and clean with a good contact cleaner

[manaranjoh]

I was with the same problem a long time, TC and pending descent lit sporadically. The solution is very simple, change the stop light switch pedal brake. It seems impossible but it WORKS! If you are handy, it will be enough to disassemble and clean with a good contact cleaner.