G251 Audi A3 (8L)

   #1  

petergw

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Hi. Had a VAG-Com unit for while to sort out problems with my son's Audi A3 (8L). Has done a brilliant job so far. But, I now have a problem. ABS warning light came on, did the scan and found that the longitudinal acceleration sensor (G251) was causing the problem. Bought a new sensor from an Audi dealer and fitted. Now trying to do the calibration as the new sensor is reading 24.03 m/s^2. According to the manual you need to login. Enter 40168 and Do it!. Then select Basic Settings and enter Group 069 and then Go! Did all this. First point is that there was no acknowledgement for successful login - should I get something like that? Second, field 1 says "Adjustment" and the ABS warning lamp - K47- is flashing. It has been sitting there doing this for 8 hours now.:confused: Surely it should not take this long? Have I done anything wrong? Is it possible the sensor is faulty? The warning light does not come on now with the new sensor but obviously needs setting to zero. Hope that soemone can help.
Regards,
Peter
 
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Uwe

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Please post up an Auto-Scan so we can see what this car is made of.

-Uwe-
 
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petergw

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Below is a scan after clearing fault codes. Driven car with new sensor. So not showing any fault with the longitudinal sensor now.

Code:
Sunday,27,April,2014,11:45:10:13235
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0 (x64)
Data version: 20140212


VIN:    License Plate: V749MOA
Mileage: 93395   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8L - Audi A3/S3 (1997 > 2003)
Scan: 01 02 03 08 15 16 17 22 35 37 45 55 56 57 75 76
 
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AJQ.lbl
   Part No: 06A 906 032 R
   Component: 1.8L R4/5VT      01 0002  
   Coding: 05600
   Shop #: WSC 06435  
   VCID: 2D51D246E7228D76001-5140

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1J0-907-37x-ABS.lbl
   Part No: 1J0 907 379 AA
   Component: ABS/EDS 20 IE CAN  V008  
   Coding: 13504
   Shop #: WSC 06435  
   VCID: 70EF0B323090A09E6B7-4AE4

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8L0-820-043-2D.lbl
   Part No: 8L0 820 043 M
   Component: A3 KLIMAVOLLAUTOMAT_D77  
   Coding: 03141
   Shop #: WSC 06435  
   VCID: 326BC13AFE1CD28E5D3-2598

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8L0-959-655-AI8.lbl
   Part No: 8L0 959 655 G
   Component: Airbag Front+Seite 1007  
   Coding: 01104
   Shop #: WSC 06435  
   VCID: 428B91FA4EBC620ECD3-5140

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8L0-920-xxx-17.lbl
   Part No: 8L0 920 980 C
   Component: AB-KOMBIINSTR. VDO D07   
   Coding: 05444
   Shop #: WSC 00000  
   VCID: 3365C43E0106DB86565-5140

   Component: AUZ7Z0X1193675  
   ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ     AUZ7Z0X1193675

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 B
   Component: HALDEX LSC  ECC     0006  
   VCID: 1F4D388E9D8E6FE682D-4AFE

No fault code found.

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels: 8D0-862-257.lbl
   Part No: 8L0 862 257 P
   Component: CV-Pump, Alarm, RC  D13  
   Coding: 13130
   Shop #: WSC 06435  
   VCID: 428B91FA4EBC620ECD3-4EE8

3 Faults Found:
01370 - Alarm triggered by Interior Monitoring 
            35-00 - -
00955 - Key 1 
            09-00 - Adaptation Limit Surpassed
01134 - Alarm Horn (H12) 
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 45: Inter. Monitor        Labels: 4B0-951-173.lbl
   Part No: 4B0 951 173 
   Component: Innenraumueberw.    D03  
   Coding: 00001
   Shop #: WSC 00000  
   VCID: E0CFFB726070901E7B7-4AFE

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8D0-035-1xx-56.lbl
   Part No: 4B0 035 186 B
   Component:  Radio              D04  
   Coding: 00207
   Shop #: WSC 06435  
   VCID: 1F4D388E9D8E6FE682D-4AFE
Peter
 
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Uwe

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First point is that there was no acknowledgement for successful login - should I get something like that?
On a control module running the old/original KW-1281 protocol, nope; there's no explicit acknowledgement that a Login is accepted, not in VCDS, and not in the factory tools either.

Second, field 1 says "Adjustment" and the ABS warning lamp - K47- is flashing. It has been sitting there doing this for 8 hours now.:confused: Surely it should not take this long?
No, clearly not. I wouldn't have waited longer than a minute or two. Did you have sufficient battery voltage?

The warning light does not come on now with the new sensor but obviously needs setting to zero.
Driven car with new sensor. So not showing any fault with the longitudinal sensor now.
However, something really confuses me. Looking at this ABS module:

Code:
Address 03: ABS Brakes        Labels: 1J0-907-37x-ABS.lbl
   Part No: 1J0 907 379 AA
   Component: [b]ABS/EDS[/b] 20 IE CAN  V008  
   Coding: 13504
   Shop #: WSC 06435  
   VCID: 70EF0B323090A09E6B7-4AE4
That's an ABS with EDS (Electronic Differential Sperre/Locking). It's not an ESP system. That means there should not have any of the usual ESP sensors -- Steering angle (G85), lateral acceleration (G200) or longitudinal acceleration (G251). So I'm trying to figure out how you had a fault for something that shouldn't exist or how you then replaced the part that shouldn't exist..

-Uwe-
 
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petergw

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Hi,
Battery voltage OK.
Error I had before changing sensor below!
-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1J0-907-37x-ABS.lbl
Part No: 1J0 907 379 AA
Component: ABS/EDS 20 IE CAN V008
Coding: 13504
Shop #: WSC 06435
VCID: 70EF0B323090A09E6B7-4AE4

1 Fault Found:
01279 - Longitudinal Acceleration Sensor (G251)
27-10 - Implausible Signal - Intermittent

Certainly has the sensors as it came up on the parts list at the Audi dealer and I certainly found the thing exactly where it is supposed to be behind the glove box on passenger side!
It is an A3 1.8t quattro. Code 8L1 B9N AJQ EHR DXW

It did eventually stop after about 9 hours, field 1 said ERROR.

Peter
 
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Uwe

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Well, I'm scratching my head....

... Wait; I'm hearing those ABS/EDS systems DO have that sensor when they are installed in cars with AWD (Haldex), which yours does. So even this old dog learned something new today!

-Uwe-
 
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Uwe

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Does it by chance show up in Measuring Blocks, Group 006?
None of the label files we have seem to be quite right for it (given that it has this sensor but is not an ESP system).

-Uwe-
 
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petergw

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Yes it does. The old sensor was giving a value of around 0.25m/s^2. But it was wandering a bit.
New sensor at present shows 24.03m/s^2.

Peter
 
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Sebastian

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Peter, can you create a control module map per the instructions on the following page (in section "Type #2) please and send the file to us so we can update/enhance the documentation?

http://wiki.ross-tech.com/wiki/index.php/Control_Module_Maps

I am fairly certain that you got an issue with your installation. Right on the edge of the sensor generating implausible values and not registering for an actual fault. Have you the voltage/ground supply of the sensor yet?
 
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petergw

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Hi Sebastian, will do tomorrow as getting a bit late here.
Not got the voltage/ground supply of the sensor. How do I get this?

Peter
 
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Sebastian

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Looking at your maps, the non-zero value for the G251 concerns me and in fact proves that you have a physical issue with the sensor itself that cannot be fixed by a basic setting/calibration. Looking at the WIKI DTC 01279 as well as the factory repair manual, I am not even sure if this could be due to a bad electrical connection. The repair manual clearly states that a G251 sensor is very sensitive to hard vibrations and specifically hard shocks. So if whomever transported your used sensor while shipping it around or if the donor car was involved in an accident it is very likely to be bad due to that.

My next step therefor would be to get a known good sensor and try that before I go about hunting any other ghosts - while having in mind that the old sensor was reading plausible values. Just to be sure we're on the same page here, what was the part number of the old as well as the new sensor?
 
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petergw

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The sensor I fitted is brand new supplied by an Audi dealer. They searched their database and had the sensor shipped in the next day (presumably either another branch or Audi UK). I have not given the sensor any shocks so perhaps it has been damaged in transit to the dealer or the dealer dropped it. I did see in the service manual that the device is very sensitive but since I have done nothing to shock it assumed that the problem was elsewhere. The old sensor gave a reading of between 0.25 and 0.35 - it was a little bit temperamental which is what caused the warning light to come on. With old sensor ABS warning light comes on, with new sensor it doesn't! Just needs calibrating.
 
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Jack@European_Parts

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I would verify the connections and wires with temporary overlay to examine the issue so you are not just changing things for the sake of it.
 
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petergw

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Looks like it is a wring fault. Twisting the wires around gets the reading to change. Anyone know how you can release the contacts from the plug as it is either poor crimping, contacts that require tightening up or a break in one of the wires.
 
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Sebastian

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Peter, as I asked before - what is the part number of the old/original you took out and the new sensor you installed?
 
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petergw

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Got it working. After playing around with the sensor not fitted in it's bracket it would seem the sensor its very sensitive to being level - but more so if tipped slightly down at the front. Car was sitting on dead level ground but was lower at the front since last time I checked the sensor (fuel tank less fuel). Ensured car dead level and sensor came in at 0.28m/s2. Old sensor gives about the same reading but is slightly noisy showing that it is breaking down. Tried calibration but this still did not seem to work (did not change the value and field 1 never changed to OK). But as the figure is well in the tolerance, should I worry about it?
 
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