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147jtd ABS & VDC System failure

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147jtd abs vdc
7K views 28 replies 13 participants last post by  Jason-JTD 
#1 ·
In my '04 147jtd the first time I press the brake pedal after starting the car, both the ABS and VDC System failure warnings go off, then stay lit up until I switch the ignition off. I've tried disconnecting the battery for about 12hrs, but this has not helped. Anyone have any ideas?
Many thanks,
 
#2 ·
If the battery is low on charge this can throw up faults. Give that a try first before you do anything else.
 
#3 ·
Just spoke to rarebear and he has confirmed that the cable I have to fit my 156 and spider should fit your 147. Once you've sorted the battery out and ruled this out you could bring it over to mine and we'll plug it in using alfadiag. See what fault it brings up. That would give you a starting point on what to change if there are any faults. I'll be able to clear any faults on the ECU too. I live in charminster so 5 mins form you.
 
#7 ·
Tomorrow is fine for me. Any time after 3 as I'm usually back from work about 2.30 ish give or take a bit of traffic. If not friday then anytime sunday should be ok. I'm up in london sat at autodelta for a remap so that day I won't be available. I'll pm you my address mate. Let me know what you decide.
 
#8 ·
Could possible be the altinator is nakered and the battery is not holding its charge? Had Same problem on my 156 and it turned out to be the altinator. Is your battery holding charge ok?
 
#9 ·
It does sound suspiciously like the brake light switch, a common problem; if it is that, there will be no fault code recorded.

You could try removing the brake light switch & giving it a good dousing with contact cleaner, which may cure the problem temporarily - if you're really brave, try dismantling the switch & cleaning it, but you'll probably find that one of the contacts is heavily eroded, so a replacement switch (around £15) is the only permanent cure.
 
#11 ·
Re. the brake (light) switch, is it under or near the pedal and is it an easy enough fix to do yourself?

I'm getting intermittent ABS and VDC failure warnings (AlfaDiag shows nothing)-not a huge issue but getting more common.
 
#13 ·
I bought my 156 jtd with the ABS light on, its now MOT time so need to get rid of it. Both front sensors have the same resistance, i havent checked the rear yet.
I have a OBD2 cable and downloaded KWP71Diag.exe. Will that alone be enough to determine where the problem lies? Thanks in advanced
 
#14 ·
I have had this same problem.

http://www.alfaowner.com/Forum/alfa-147-156-and-gt/236247-abs-and-vcd-failure.html

I have had it for a while now so hopefully that is the cure for me too! I have ordered rarebares cable though just to have a check over and make sure it is just that switch. It is definitly not the battery on mine as I put a new one only 18 months ago and the problem was there before and still is now.
 
#21 ·
Right, my comp wont sync with the ABS ECU but it will link up with the engine ECU?? why is that?
ABS light and handbrake lights are still on, It isnt any of the wheel sensors, nor the brake pedal siwtch. Connector to the ABS module seems to be corrosion free.
What can i check next? Please help me solve this problem!
 
#25 ·
i joined pins 1 and 7 in com lead (just to change ABS light). The comp still couldnt link up to the cars diagnostic. I got two different erros from fiatECUscan. One was 'you need k line/vagcom/OBDkey interface to connect to this module' i then switched the cable type in the settings from elm 327 to OBD. I then got the following error 'No ECU response. Check your cable and serial port settings'
Any help would be really appreciated!!
 
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