HELP: Acceleration Sensor G251 | Volkswagen Mark IV Forum

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for-mo F I have licensed VAG-COM, but I haven't bought the Bentley manual because there isn't one for my car. I have a 2000 V6 4motion golf that has the following ABS fault code: 01279 Acceleration sensor G251 57-10 Electric Circuit Failure - Intermittent Can anyone figure which sensor this is? #1 · Feb 9, 2004 I have licensed VAG-COM, but I haven't bought the Bentley manual because there isn't one for my car. I have a 2000 V6 4motion golf that has the following ABS fault code: 01279 Acceleration sensor G251 57-10 Electric Circuit Failure - Intermittent Can anyone figure which sensor this is? Sort by Oldest first Oldest first Newest first Most reactions #2 · Feb 10, 2004 Its your 'Longditudinal' acceleration sender, its only fitted to 4motion's and its located on your left A-pillar(beside the glovebox), if you pull of the end trim on your dash it should be located behind there, its a small box (think its about 2 by 2 1/2inch) it has one multiplug with 3 wires coming out of it and the only 2 faults I have seen with them is, 1 an insecure multiplug (which needed refitted) 2 the sender itself being insecure (which needed resecured) If it is insecure make sure its located at the correct position as it's what tells your ESP/EDL/TCS etc etc what the car is doing movement wise. Hope thats helped you out. ) #3 · Feb 12, 2004 Thanks for that. I found the sensor - everything looks OK. I re-seated the connector and the mounting is firm, but I'm still getting intermittent ABS lights. No DTC from it so far though. Do you know where the cable connects it to - is it the ABS unit under the bonnet? The other possible is that I have EBC green pads and am not washing the car much at the moment 'cos there's no point. If they have a more metallic compound they might be confusing the wheel sensors. I nearly died today - for some reason my brakes started ABS'ing as I approached a (very busy) roundabout at speed. car just wouldn't stop - it ABS'd for about 30yds. Somehow the traffic on the roundabout parted as I just kept going. I took it very easy for a while and tested the brakes again and again, but couldn't get it to do it again. I am on some new tyres - Ventus - which were cheap (but good grip in the dry) so I'm wondering if it was diesel on the road and tyres that aren't so good for those conditions. #4 · Feb 12, 2004 As I was reading what you wrote I was thinking " I wonder if there was a diesel spill" as they always happen at aproaches to roundabouts due to braking and motion transfer, then I read you already thought of it. Are you sure its ABS lights and not ESP lights that are coming on?, are they red or yellow when they come on?, have you tried disabling your ESP to check the difference? You may be right with your sensors playing up but more likely coz your wheels are rotating at different speeds having new tyres fitted to one axle. Having vag-com is handy, go into ABS (03) read measuring blocks(08) and pick channel (001) these are your wheel speed sensors road speeds, now because when you start the car the ABS ECU does a self test and you say theres no faults, the wiring to them is ok, pick vag-scope and go for a drive, once above aprox 7km (4mph)they should all list the same speed, if they are then theres no problem, if thers one or more different you will then know which one to check, remember if theres no warning lights on after the car is started then the wiring is ok so it must be something to do with the sensor clearance or the wheel speed. hope thats a help. #5 · Feb 12, 2004 Where does it connect to you asked, well it goes straight into your ABS unit under the bonnet. It should be.......terminal/pin Sensor .............ABS ECU 3/1 ..................47/14 3/2 ..................47/30 3/3 ..................47/45 but like I said if theres no fault listed after startup then the wiring is ok due to the fact it does a self test, thats why the warning lights remain on for a couple of secs after startup. Handy to know aint it. #6 · Apr 8, 2004 This one's a nightmare... I don't think the problem is the wheel sensors - they all show the same speed. All 4 tyres were changed together - one of the benefits of a 4motion is that all the tyres get shredded! I'm glad you pointed me at the measurement blocks though - I realised the Acceleration reading can be erratic. Most of the time it does what you'd expect - parked on a hill it gives a small reading accelerate and it goes up, brake hard and it reads high. However it occassionally reads 24 ms-2 (which appears to be the highest reading it gives) when the car is in steady state. So I went to the dealer who wanted ?497 for a new sensor. Not the best idea, but I found an identical one at the salvage yard, so for ?20 thought it worth a try - and guess what... it still gives an erratic reading. I have also reseated the 47-way ABS connector and sprayed contact cleaner on conductors. Are there any other components involved? It seems to me it can only be a fault with the ABS unit electronics or a power supply/regulation problem. The Vcc reading at the ECU is giving a steady 13.2 up to 13.8 v reading with VAGCOM. I've never looked at the lambda sensor readings before, but they seem to fluctuate quite a bit around +/- 5% when the engine is idling. Any ideas ? #7 · Apr 8, 2004 I got the erwin brakes manual and it talks about doing a basic setting of the sensor if it is replaced - this does some kind of zero adjustment calibration. This sounds like a plausible cause for my problem. How do I do this basic setting with VAG COM ? #8 · Apr 15, 2004 I have the same problem with my 4 motion, 01279 - Longitudinal Acceleration Sensor (G251) 57-10 - Electric Circuit Failure - Intermittent Seems to come and go, Also had the red handbrake light come on accompanied by a beep or two. Does this code indicate which sensor is faulty, if indeed it is a sensor fault.? Occasionaly get this fault when the red handbrake light comes on with beeps: 01044 - Control Module Incorrectly Coded 35-10 - - - Intermittent Has anyone any idea`s !!!!!!!!!!!!! #9 · Apr 15, 2004 After fitting the sensor from the breakers I've not seen the warning lights or DTC since. I've done at least 500 miles since on a variety of types of road - everything from M6 toll road to bumpy lanes driven rally-style. I wasn't happy from the measurement blocks I was seeing from the sensor, because it still looked erratic to me... but maybe there was more to it than the measurement block showed. BTW the lights I got were both yellow - the ABS light and the traction control light. Another observation I've made today is that I got over 28mpg on a 300 mile journey travelling at about 90mph - and that's on cheap Tesco petrol. Previously I was often as low as 22mpg - even on super unleaded. #10 · Apr 16, 2004 was it the abs sensor on the wheel hub that you changed? If so how much are they? and which wheel was giving all the problems!!! #11 · Apr 16, 2004 No it was the longitudinal acceleration sensor that weelon put me onto above. It is a small box about an inch cubed. It is located behind the glove compartment fixed to the inside of about where the top front door hinge is. You can see it by pulling off the passenger side end panel of the dashboard. It has a 3-wire connector. #12 · Jan 7, 2007 I know this post is old but I have the exact same problem as for-mo. I have read everything in all the posts and I am quite happy to find a new sensor and replace it myself. I am normally quite good at removing interior trim without any damage, but the end trim of the dashboard on the passenger side does not want to come off at all! [8o|] Any ideas to get this trim off without breaking it would be very much appreciated. Cheers #13 · Jan 10, 2007 Just slip something behind it and it will snap off, mine was quite tight, but they do come off #14 · Jul 4, 2010 did you get this sorted? i have exactly the same problem. both abs and traction control lights on and my ABS going crazy under normal breaking. I have had the fault codes read and it came back intermitent signal on the g251 sensor. everything looks secure, plugs on ok. my sensor was located to the left of the steering columb, you got to it by removeing the lower facia panels. #15 · Jul 4, 2010 this sensor can be reset i had the same prob with the warning lights on mine and done a reset and its been fine for a few mths now it can be reset by doing this http://www.tt-forum.co.uk/forum/viewtopic.php?f=2&t=153716 Insert Quotes Post Reply

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