VAG-COM Gurus - Code Interpretation Help Needed

[The Leningrad Cowboy 0]

Right. Persistant problem with the ABS light coming on was fixed by replacing an ABS sensor. Trouble is, driving a couple of miles brings the light back on again (and it's not a 12mph issue). The fault code is 01276, which the garage cannot track down, and nobody they've talked to knows what it is.

 

Do any of you genii know what it is? You could solve a head-scratching problem for a poor, befuddled C driver. Help appreciated.

 

[Joe M 0]

01276 ABS Hydraulic Pump - V64

[The Leningrad Cowboy 0]

Nice one - what's the V64?

As luck would have it, I have a spare pump which I was expecting to use anyway!

[Joe M 0]

Ive got no idea, I just copied the code from a list for you.

I think theres a user RW1 that has a lot of knowledge on this stuff, hes probably the best person to ask.

[The Leningrad Cowboy 0]

OK, cool. Thanks for your help.

[RW1 0]

01276 – ABS Hydraulic Pump V64 – Signal not to tolerance.

 

V64 is the reference wiring diagram unit number for the ABS pump.

 

First the simple ones to check, then more effort involved......

 

On the pump is a 4 way plug to the near-side by the suspension inner wing area under the cooling header tank. Pull it off and apply some WD40. Check for ABS lamp & fault code.

 

Still a problem, measure the resistance across the pump connector (pump side) two inner pins (pins 2 & 3) of the 4 way connector (the two thin wires). This should read between 29 & 40 ohms. This is the pump sender. If not OK then the sender is part of the pump and not a separate part, so it’s a pump unit replacement job.

 

If not that, then take off the lower door pillar kick panel and disconnect the ABS ECU connector (battery earth should be disconnected before doing this part. Across pins 49 & 31 of the connector, line out to the two thin wires on the pump connection above to check the wires are OK.

 

If not that, then it’s the under dash out on the passenger footwell. Up behind the glove box, there are the 3 ABS relays. First of all check the two 30 AMP (green) fuses are OK.

 

Next, change over the two inboard relays usually marked “179” (rhd only car). If this cures, then one of the relays is duff and needs to be replaced. These relays are not standard logic internally so it needs to like for like and the part number is 357 927 843A. They can be difficult to remove and are directly linked to the battery via the 30 amp fuses co-located so put no metal things near without the battery disconnected such as a screw driver.

 

I suspect it will be the ABS pump sender that has gone skyward.

 

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[The Leningrad Cowboy 0]

Thanks for your time writing all that out! I'll see if I can try all those possibilities. May take me a while!