Emergency Brake Assist Failure

Emergency Brake Assist Failure

Author
Discussion

Ken Figenus

5,678 posts

116 months

Friday 29th December 2017
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I haven't received it yet mate but I think Steve (Aston 1936) discovered he could read more codes and get deepetr access if he told his generic OBDII device that the car was a Ford ( https://aston1936.com/2016/04/12/getting-more-from... ). He then discovered this Foxwell device came with the unique AM codes. Steve deserves a big warm British beer biggrin

bogie

16,342 posts

271 months

Friday 29th December 2017
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PrAston said:
I'm getting a triumvirate of error messages on my 05 DB9: Emergency Brake Assist Failure, DSC Service Required, and Traction Control Temporarily Off. It seems to be a genuine failure, i.e., shutting off and restarting doesn't clear it. It appeared after the car had been sitting for about two weeks, and I had never had the warning come up before.

From what I've read it sounds like the Brake Pressure Transducer is the most likely culprit. I know it can be other things, but my code reader won't talk to the ABS module, so I don't have any way of narrowing it down. Should I replace it on a hunch? If it's faulty and I replace it, will the message go away on its own or does it have to be cleared manually? It doesn't look like bleeding the brakes is required, but if it is, can that even be done the conventional way? I ask because the manual talks of hooking up to AMDS which manipulates the ABS pump to bleed the brakes.

Any other tests that can be done or general suggestions? Trying to avoid a 250-mile trip to the dealer.
the transducer is likely and cheap/quick enough just to try a fix. It will clear itself after a couple of stop/start cycles....at least mine did

I didnt need to bleed the brakes as didnt lose hardly any fluid, it really was just a trickle if you are quick. Check brake fluid level after and top up a little if needed.

Rappa

625 posts

269 months

Friday 29th December 2017
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Ken,

Many thanks. Ford software it is then, please let us know how it goes when you get it.

Sean

Edited by Rappa on Saturday 30th December 01:47

Ken Figenus

5,678 posts

116 months

Saturday 30th December 2017
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Rappa said:
Ken,

Many thanks. Ford software it is then, please let us know how it goes when you get it.

Sean

Edited by Rappa on Saturday 30th December 01:47
I will - although my 'childlocks' error has reset itself by now! I imagine the software/error codes are quite bespoke to Aston by now hence needing the Aston OBDii version but looks like you get further telling a generic reader to reference Ford error codes (on V12's - prob not V8's as there is some Jag heritage there).

PrAston

36 posts

79 months

Wednesday 7th February 2018
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I replaced the transducer (no bleeding required thank god), and have driven the car through at least 6 or 7 stop/start cycles, but the message has yet to clear. How long should I give it before I start looking into other possibilities?

davek_964

Original Poster:

8,796 posts

174 months

Wednesday 7th February 2018
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PrAston said:
I replaced the transducer (no bleeding required thank god), and have driven the car through at least 6 or 7 stop/start cycles, but the message has yet to clear. How long should I give it before I start looking into other possibilities?
You should already be looking. Mine cleared each time I stopped / started the car and only came back when braking.
Is yours permanently on? If so, that seems odd.

Mine was the brake pedal travel sensor - but as I say it cleared when I turned the car off and only came on again when braking.

PrAston

36 posts

79 months

Tuesday 12th June 2018
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I finally admitted defeat (after trying a new transducer, new battery, and everything I could do with a Foxwell NT510) and took it to the dealer. Tech says all the relevant sensors are reporting normally, which means its the ABS module, to the tune of $3800. The part is about $2800 of that, the labor is about 4.5 hours @ $175, the rest is fluid, tax, etc.

The tech has an inquiry into the factory to see if there are any other possibilities, but no word on that so far. Is the ABS module a likely culprit? And is $2800 a legitimate price for it? I've located a used one for $819, but obviously there is some risk there, even at a saving of $2000.

davek_964

Original Poster:

8,796 posts

174 months

Wednesday 13th June 2018
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If the car is showing the warning, surely it's logged a fault which tells them why?

sundayjumper

529 posts

281 months

Wednesday 13th June 2018
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davek_964 said:
If the car is showing the warning, surely it's logged a fault which tells them why?
Depends.... the car will log some errors, but it may take some investigation / experience / luck to find the actual fault.

Example: my old BMW once threw up an engine warning, and on reading the codes it said there was a fault with injector 1, injector 2, injector 3 & injector 4. Four new injectors from BMW are a lot of £££s.

But if I had replaced all four injectors that wouldn't have fixed it, because the actual problem was that the wiring to *one* injector had come loose, rubbed against the fuel rail and was shorting out. Actual repair cost - some of my time, and a couple of inches of insulating tape.

Beware of "computer says...." !!


davek_964

Original Poster:

8,796 posts

174 months

Wednesday 13th June 2018
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sundayjumper said:
davek_964 said:
If the car is showing the warning, surely it's logged a fault which tells them why?
Depends.... the car will log some errors, but it may take some investigation / experience / luck to find the actual fault.

Example: my old BMW once threw up an engine warning, and on reading the codes it said there was a fault with injector 1, injector 2, injector 3 & injector 4. Four new injectors from BMW are a lot of £££s.

But if I had replaced all four injectors that wouldn't have fixed it, because the actual problem was that the wiring to *one* injector had come loose, rubbed against the fuel rail and was shorting out. Actual repair cost - some of my time, and a couple of inches of insulating tape.

Beware of "computer says...." !!
Absolutely - but I'd want any faults fully investigated before spending that kind of cash on an ABS module!

yvr

311 posts

145 months

Wednesday 13th June 2018
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I don't know if the DB9 ABS unit is sourced from Jag, but XK8s suffered from broken solder joints inside the ABS module which resulted in similar dash warnings. Lots of info if you google, and a DIY repair.

PrAston

36 posts

79 months

Thursday 14th June 2018
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I actually had an XK8 that was throwing similar codes, but I sold it before I really investigated it properly. It does seem to be a common problem with XK8s, and although the DB9 uses a similar looking Ate unit, I can't find any reference to a comparable failure in a DB9.

The dealership apparently heard back from the factory and believe it is indeed the ABS module. Whether I go with a new or used module, or repair the old one, is there any part of the job that would be dealer-only? I ask because I can only assume the dealership would refuse to install a used or reconditioned part, and if an AMDS unit is required to bleed the system or reset codes, that results in the potentially awkward situation where I have to ask the dealership to finish a job they didn't start, not to mention the time and hassle of moving the thing back and forth around the state.

Incidentally, the price of a new module averages around $1300 from several sources, so the dealer would seem to be doubling the price.

EBruce

200 posts

167 months

Saturday 28th September 2019
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Bump on a old, but very helpful thread. Thanks to all who offered help here over time. I thought I would first share my experience and what I have done to repair and then I’m hoping a couple of others who did the ABS wiring harness can chime in.

Several months ago I too got the emergency brake assist failure, ABS, traction and handbrake lights. Looked like Christmas on my dash. Fortunately I do have the Foxwell 510, and the errors were:
-P0031 Rear left wheel speed sensor mechanical fault
-P0030 Rear left wheel speed sensor electrical failure

Given these faults, first thing I did was to replace out the left rear wheel speed sensor. Codes persisted so I swapped right rear and left rear ABS wires at the abs module, and the codes switched to the rear left so then I knew it was not the module (thankfully). After sharing my issue on AM Facebook forum, It was suggested that I should replace out the wheel hub and bearing. I just installed it last night and went for a drive. I am crushed to report that all the lights came back on. The only other thing I can figure it could be is something wrong with the wiring from the abs module to the sensor. I did a slight tug on the sensor wires and they appear to be connected fine. Any thoughts or guidance from anyone with experience? I don’t even think there is a rear harness repair...

@With these feet You mentioned having replace the rear wiring. Did you have codes before you changed it and if so were they the same as mine?

@Manwhonever was Same question did you have codes before yours was replaced?






Philipcollins340

27 posts

60 months

Tuesday 11th August 2020
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Vantage V8 Problem

I have the common 'DSC Service /Traction control temporary off' messages on my 2007 Vantage and I understand that this can be due any one of several sensors in the ABS/Brake control system. I have just been quoted >£160 for a diagnostic check from my AM specialist which seems more than a bit steep for 10 minutes work. I replaced the Brake pressure transducer and the brake travel transducer with no result. I now suspect the wheel sensors or associated wiring or hub/reluctor corrosion.

Getting totally fed up with chasing this fault !
I have a genetic OBD2 analyser but it does not support the Vantage V8 Body socket.

Does any one near-ish to St Albans (North London) have an Autoenginuity or Foxwell scanner or similar that can communicate with the Vantage BODY OBD port that I could use. I need access to a scanner to isolate the faulty sensor or associated wiring. Happy to drive to you up to 100miles for this?

Any suggestions welcome

Phil C - UK

huntsen

135 posts

92 months

Wednesday 12th August 2020
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I have a Foxwell with AM firmware that you're welcome to come over and play with. I'm NE of High Wycombe on the A404.
PM me.

Philipcollins340

27 posts

60 months

Sunday 16th August 2020
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Hello Tony,

That would be magic. I see that you have an AMV8. I wonder if you saw the dreaded 'DSC service required/Traction control temporary off message' and if you used the the Foxwell to fix it?

Anyway , I would be very keen to try out your Foxwell .

I am retired and available most days. What day/time would suit you ?

Best Regards

Phil

huntsen

135 posts

92 months

Monday 17th August 2020
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Phil,
Drop me an email. My address is listed in my profile under 'Email Me'
Tony