Alfa 147 ABS EBD ASR Failure C1276 - Alfa Romeo Forum
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Old 06-06-10
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Help Alfa 147 ABS EBD ASR Failure C1276

Hello everyone,

i hope someone of you could give me a hint.

First of all, sorry for my bad english. If something is unclear, please ask. I will try to explain it better.

My Story:

2007 I bought a Alfa 147 (2001) and one year later my car started to get an ABS EBD ASR-Failure. At the beginning it was just ones a month, but since a half year it started to appear about 90% of the time.
I bought an KKL-Cable and downloaded FiatECUScan. It said the problem is C1276 ABS/ESP SV Relay (haven't got ESP). After this i went to some Alfa garage and changed the hole ABS unit (an used one from Ebay.. 2000€ for a new one was too expensive). For 2 weeks the problem was gone, but now the same failure appears again.
I have changed the fuses (F42 and F4) and the battery (new is at 12,76V - engine off).
I also checked the ECU-connector. Seems to be fine and clean.
I think - but I'm not 100% sure - the failure appears more often when there's dampness.
On nice days i can drive some time without having the problem appearing.

Sometimes the failure appears when i start the engine, but most time it appears when i drive between (20-50km/h).


I really don't know how to search on. I'm thankfull for every constructive proposal.
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  #2 (Post Link)  
Old 06-06-10
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how old is the battery ... the ABS unit is very sensitive to bad voltage ... also get the terminals on top of the battery make sure they are nice and clean and have a good connection, I once got this error when I was doing some work on the car and hadn't reconnected the battery connections properly ..
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Old 06-06-10
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Hey 156Chris,

i think about 2 month!? It's a 74a Banner Battery..

I will check and clean the terminals again..
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Old 06-06-10
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The fault code is refering to a short circuit of the brake light wiring, this is normally down to where the wiring passes through the front bulkhead or where it runs through the boot lid to the spoiler brake light (if fitted).
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File Type: jpg Kaiden-Lee 016.jpg (92.7 KB, 70 views)
File Type: jpg Kaiden-Lee 015.jpg (100.3 KB, 56 views)
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Old 06-06-10
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thanks smaky.

I had a look (a short one - heavy rain )

battery terminal seems to be fine.

the connector to the spoiler brake light is fine, too.

I have some worries about the rust.

on a nicer day i will have a look on the cables to the spoiler brake light. I seems that i have to take off the whole boot lid - or at least the covering !??
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File Type: jpg 2010-06-06 15.02.36.jpg (57.5 KB, 52 views)
File Type: jpg 2010-06-06 15.11.36.jpg (40.0 KB, 44 views)
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Old 06-06-10
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Actually I read the first post wrong, it's the handbrake switch at fault, permanant short to earth so I'd say you have the hand brake light on all the time or never at all. Which means this whole problem is under the center console, but the boot on yours is an issue too.
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Old 06-06-10
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Originally Posted by Smaky View Post
Actually I read the first post wrong, it's the handbrake switch at fault, permanant short to earth so I'd say you have the hand brake light on all the time or never at all. Which means this whole problem is under the center console, but the boot on yours is an issue too.
The hand brake light is off, as long the failure doesn't appear.

After the failure appears following lights are on:

ABS-Light
ASR-Light
hand brake light


The hand brake light also appears, when I pull the hand brake. As normal..
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Old 06-06-10
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short questions..


1. Could it be a faulty ground connection of the ABS Unit ?


2. Which one is the power cable for the ABS Unit? (view Picture below) 1 - 2 - 3 - 4 or none of those..
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File Type: jpg battery.jpg (68.8 KB, 59 views)
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Old 07-06-10
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hey,

while searching for the c15 earth connection i found a cable "hanging around" (view picture below). It's next to the brake pedal.

Can someone tell me what this cable is for (black, white-green) ?

and.. how do I plug it in again ? white-green site on the right or on the left site of the connector?
solved, but nothing to do with the ABS-Failure..



Still searching for the Earth Connection C12 and C15... (view wiring diagram)


Thanks
Attached Images
File Type: jpg PICT0011.jpg (103.9 KB, 103 views)
Attached Files
File Type: pdf abskram.pdf (65.3 KB, 103 views)

Last edited by Magixo; 07-06-10 at 11:20.
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Old 07-06-10
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Found Earth Connection C12. Seems to be fine. Nothing loose.
All brake lights working fine, too.

Repaired the rust spots. Hope this helps.

*Still searching for C15*
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Old 07-06-10
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Had a similar problem on mine it was a miss match inside the prake pedal switch just needed a new switch.
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An interesting break there, at least I was in the ball park with broken brake light wiring.
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Old 07-06-10
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Originally Posted by col748 View Post
Had a similar problem on mine it was a miss match inside the prake pedal switch just needed a new switch.
Hey col748, thanks for your reply.

I thought about that, too.
But..mostly the failure comes without pulling the brake pedal. Could it still be the brake pedal switch? Can i test the switch with a multimeter?

btw. cruise control works fine.. (goes off after pulling brake pedal)

Originally Posted by Smaky View Post
An interesting break there, at least I was in the ball park with broken brake light wiring.
the broken cable was just for the cruise control. ABS failure is still there.

Last edited by Magixo; 07-06-10 at 21:25.
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Old 07-06-10
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It's the brake pedal switch at fault then.
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Old 08-06-10
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Originally Posted by Smaky View Post
It's the brake pedal switch at fault then.
okay, i will give it a try.

brake light switch and brake pedal switch is the same, isn't it?
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Old 12-06-10
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hey,

i've replaced the brake light switch... but failure is still there

yesterday (nice weather) the failure stayed off.

But today it rained.. Failure appeared again.
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Old 19-06-10
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i've checked the rear abs connectors.. seems to be fine and clean.

i've recorded the wheel speed with fiatecuscan.. and i my rear right sensor dropped to 0 km/h for a second.

See my xls file on row 336 or check the diagram.

I will record it once again to check if that happens often.
Attached Files
File Type: xls abssensoren.xls (60.5 KB, 39 views)
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Old 15-08-10
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still haven't found a solution

done some more abs wheel sensor testing..

Like you can see on the pictures, one sensor is always breaking down to Zero. But i don't know if this causes the failure or if this is "normal" (fiatecuscan 2.X)

For me it looks like there's something wrong with the connector on the abs unit, because it's always another sensor which is breaking down. I have opened the connector once, but all cables looked fine for me...
Attached Images
File Type: jpg abs1.jpg (32.5 KB, 43 views)
File Type: jpg abs2.jpg (36.2 KB, 24 views)
File Type: jpg abs3.jpg (42.0 KB, 21 views)
File Type: jpg abs4.jpg (36.0 KB, 11 views)
File Type: jpg abs5.jpg (41.9 KB, 13 views)
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Old 12-02-13
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Sorry for digging old topic, i have same problems... Was this solved?? What was the problem?
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