Battery Message & Cold Weather

[a8 tech]

post a diag log
post no load battery readings before cold crank

[vwawudi]

^^^
Hey A8, I've looked at your flickr pics and can't figure out what mods you've made. VCDS noob I confess. Have you fitted LEDs to your ride?

[a8 tech]

Sorry, there for another thread for dis and cruise retro fit
I have retro fitted rear led for a B8 A4 saloon

[theblacksurge]

I hooked my car upto a VCDS today. Checked my battery readings against the screenshots earlier in the post.
They are roughly the same but with one exception. The Battery Capacity (actual/available) is showing as 0 Ah. Both before and after engine start.

Also I have the fault code: 03041 - Energy Management Active

Can anybody enlighten me further?

[a8 tech]

0 ah in mvb 20 zone 3 means

Battery internal resistance referred to theoretical internal resistance
Tappable charge in Ah
The higher the number, the better the battery condition

so the battery is very poor

now the shut off stage needs to be clarified with ambient readings etc this can be found by listing the full fault code and all the information, also list mvb block 21

Can I ask if you have concert or symphony radio fitted to this vehicle?

[theblacksurge]

I have the Concert radio. These were the values I logged earlier;


Address 19: CAN Gateway (8T0 907 468 H)
16:36:36 Group 018: Power Supply (Battery)
14.800 V Battery Voltage
4.0 A Battery Current
3.0°C Battery Temp. (Estimate)
5.0°C Battery Temp. (Ambience)
16:36:36 Group 019: Power Supply (Battery)
63.0 % Battery State of Charge (SOC)
10.0 % Battery State (as shown in MMI)
64.0 % Battery Aging (derived fr. Load)
113.0 % Battery Aging (derived fr. Output)
Sunday,26,December,2010,16:37:33:04075
VCDS Version: Release 10.6.2
Data version: 20101123

16:37:30 Group 020: Power Supply (Battery)
4.2 mOhm Internal Battery Resistance (actual)
3.0 mOhm Internal Battery Resistance (stan.)
0 Ah Battery Capacity (actual/available)
12.50 V Quiescent Voltage
16:37:30 Group 021: Power Supply
Inactive Idle Speed Increase
Inactive Fresh Air Blower Reduction
StatCurStg 0 Quiescent Current Stage (actual)
Yes Auxiliary Heating activatable

16:37:30 Group 020: Power Supply (Battery)
4.2 mOhm Internal Battery Resistance (actual)
3.0 mOhm Internal Battery Resistance (stan.)
0 Ah Battery Capacity (actual/available)
12.50 V Quiescent Voltage

16:37:30 Group 021: Power Supply
Inactive Idle Speed Increase
Inactive Fresh Air Blower Reduction
StatCurStg 0 Quiescent Current Stage (actual)
Yes Auxiliary Heating activatable





Address 19: CAN Gateway Labels: 8T0-907-468.clb
Control Module Part Number: 8T0 907 468 H HW: 8T0 907 468 H
Component and/or Version: GW-BEM 5CAN H06 0091
Software Coding: 000303
Work Shop Code: WSC 06325 000 00000
VCID: 4686DB6148DB
1 Fault Found:
03041 - Energy Management Active
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 74
Reset counter: 69
Mileage: 63672 km
Time Indication: 0
Date: 2010.11.18
Time: 19:17:00

[a8 tech]

Firstly check via address 56 (radio) if the software version is lower than SW0310, if it is then its likely the tmc is active all the time as there is a fault with earlier software versions

Check whether the TA symbol is permanently shown on the mmi screen

If its 0310 or newer then we need to keep making sense of the readings found, I will say it looks like the battery has seen better days but is it because its being drained or just defective and deteriorating


The vcds log is also hard to read on a forum page


ok lets see http://www.ross-tech.com/vcds/tour/dtc_screen.html

Not all the info has transferred with vcds and vital battery shut off stage history is missing from group 21

The date the fault first started seems correct and it shows its occurring daily.

So if we can see what stage the manager is cutting in then it will tell us if there is a drain or if the battery is defective.

I suggest the battery is either recharged via a slow 24 hour recovery charge or replaced due to the aging readings displayed