B6 S4 instrument cluster bad range information

   #1  

nugentp

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Wondering if anyone has seen something like this before and can advise corrective action.

IMG_5234.jpg


Car is 2003 with the Bosch RB4 cluster - no fault codes - but with cold weather and lack of regular use I think a low/flat battery has corrupted some settings in the cluster as it now reports something ridiculous like 1240 or 1250 miles range in the tank - regardless of fill level.

I do suspect one of the fuel level sensors is on the fritz as the needle doesn't appear consistent below roughly half a tank so I am also wondering if I need to renew that and go through some calibration / adaptation sequence. I have had a look thru usual wiki pages and Audi manuals that I have but not seeing anything obvious on the subject of range (other than the option to make small corrections on what info comes from the ECU).

Or is there a kind of master reset / default that I can choose through VCDS and manually code back all the components attached to the various CAN busses on the car ?
 
   #2  

PetrolDave

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Please post a full unedited VCDS Auto-Scan of this B6 S4 (great car BTW, I've owned 2 of them previously) so we can see how it is coded and what fault codes are showing.
 
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nugentp

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Like I said - no fault codes - P/N for the cluster and coding info below though:

Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 980 L
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 01401
Shop #: WSC 00001
VCID: 352225780D3952E77A-5185
 
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PetrolDave

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Like I said - no fault codes - P/N for the cluster and coding info below though:

Address 17: Instruments Labels: 8E0-920-9xx-8E2.lbl
Part No: 8E0 920 980 L
Component: KOMBI+WEGFAHRS. RB4 D36
Coding: 01401
Shop #: WSC 00001
VCID: 352225780D3952E77A-5185
Doesn't look like a coding problem in the instruments, see the Ross-Tech Wiki page here

Have you checked the relevant adaptation channels? 29, 30, 32, 33 & 34
 
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nugentp

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I will read through that again and report back what's in those channels - cheers for the pointer !
 
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nugentp

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The adaptation channel contents didn't throw up anything untoward (to my eyes anyway) -

29 - 128 (standard value - sensor 2)
30 - 128 (standard value - sensor 1)
32 - 0 (not detectable tank volume)
33 - 128 (standard value - full calibration)
34 - 111 (monitoring active)

Reckon I need to dig a bit more into manuals
 
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nugentp

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I found the expected resistance values for the two fuel level sensors are in range of 50-300 ohms (in round numbers, low values @ full) on a 2003 quattro model so I suppose that is next port of call to check they are in spec... along with the full tank calibration/adaptation that can allegedly be triggered in channel 33.
 
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nugentp

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That all said - would like to think that if either sensor reading is out of range that I should have a fault code. My sense is that some other adaptation channel has got confused/corrupted during a low voltage event with a weak battery.

Is there anyway to read the values of all the adaptation channels (other than manually slogging through them all) to compare with a similarly coded RB4 cluster and play spot the difference ?

EDIT - have seen the ability to dump/capture such info in newer model components with more modern protocols but RB4 doesn't seem like it supports that.

Further Edit - still finding little crumbs of info - seems like there might be a way forward:
[Applications]
[Controller Channels Map]
 
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   #10  

Uwe

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Is there anyway to read the values of all the adaptation channels (other than manually slogging through them all) to compare with a similarly coded RB4 cluster and play spot the difference ?

EDIT - have seen the ability to dump/capture such info in newer model components with more modern protocols but RB4 doesn't seem like it supports that.
You should be able to make an Adaptation Channel Map:

-Uwe-
 
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nugentp

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Well here is the adaptation channel map (with engine running) but I dont see a smoking gun yet...

Code:
;SW:8E0-920-980-L   HW: ---  Instruments					
;Component:	 Coding:				
;Monday	8	February	2021	18:56:39:30756	
;VCDS Version: Release 20.12.0  Data version: 20201125 DS322.1					
;VCID: B522A5788D39D22C61-5185					
					
Channel		Field 1	Field 2	Field 3	Field 4
1		ERROR:	Channel 01	Not	Available
2	1				
3	100	Consumption	Indicator	 	-
4	2	Language	 	 	-
5		ERROR:	Channel 05	Not	Available
6		ERROR:	Channel 06	Not	Available
7		ERROR:	Channel 07	Not	Available
8		ERROR:	Channel 08	Not	Available
9		ERROR:	Channel 09	Not	Available
10		ERROR:	Channel 10	Not	Available
11		ERROR:	Channel 11	Not	Available
12		ERROR:	Channel 12	Not	Available
13		ERROR:	Channel 13	Not	Available
14		ERROR:	Channel 14	Not	Available
15		ERROR:	Channel 15	Not	Available
16		ERROR:	Channel 16	Not	Available
17		ERROR:	Channel 17	Not	Available
18	0				
19	31010				
20		ERROR:	Channel 20	Not	Available
21	3	Old Key	Count	3	-
22		ERROR:	Channel 22	Not	Available
23		ERROR:	Channel 23	Not	Available
24		ERROR:	Channel 24	Not	Available
25		ERROR:	Channel 25	Not	Available
26		ERROR:	Channel 26	Not	Available
27		ERROR:	Channel 27	Not	Available
28		ERROR:	Channel 28	Not	Available
29	128	TankSensor	 	 	-
30	128	TankSensor	 	 	-
31		ERROR:	Channel 31	Not	Available
32	0				
33	128	 	N/A	N/A	N/A
34	111				
35	0				
36		ERROR:	Channel 36	Not	Available
37		ERROR:	Channel 37	Not	Available
38		ERROR:	Channel 38	Not	Available
39		ERROR:	Channel 39	Not	Available
40	39	Actual Value	Insp. in 1	00 Miles	-
41	1195	Actual Value	Insp. in 1	Days	-
42	9	Min. Value	Oil in 1	000 Miles	-
43	10	Max. Value	Oil in 1	000 Miles	-
44	365	Max. Value	Insp. in 1	Days	-
45	1	Oil	Quality	 	-
46	163	Consumption	Qty. in 1	Liter	-
47		ERROR:	Channel 47	Not	Available
48		ERROR:	Channel 48	Not	Available
49		ERROR:	Channel 49	Not	Available
50	32000	Disabled	N/A	N/A	N/A
51		ERROR:	Channel 51	Not	Available
52		ERROR:	Channel 52	Not	Available
53		ERROR:	Channel 53	Not	Available
54		ERROR:	Channel 54	Not	Available
55		ERROR:	Channel 55	Not	Available
56		ERROR:	Channel 56	Not	Available
57		ERROR:	Channel 57	Not	Available
58		ERROR:	Channel 58	Not	Available
59		ERROR:	Channel 59	Not	Available
60	1029				
61	3331				
62	21				
63		ERROR:	Channel 63	Not	Available
64		ERROR:	Channel 64	Not	Available
65		ERROR:	Channel 65	Not	Available
66		ERROR:	Channel 66	Not	Available
67		ERROR:	Channel 67	Not	Available
68		ERROR:	Channel 68	Not	Available
69		ERROR:	Channel 69	Not	Available
70		ERROR:	Channel 70	Not	Available
71		ERROR:	Channel 71	Not	Available
72		ERROR:	Channel 72	Not	Available
73		ERROR:	Channel 73	Not	Available
74		ERROR:	Channel 74	Not	Available
75		ERROR:	Channel 75	Not	Available
76		ERROR:	Channel 76	Not	Available
77		ERROR:	Channel 77	Not	Available
78		ERROR:	Channel 78	Not	Available
79		ERROR:	Channel 79	Not	Available
80		ERROR:	Channel 80	Not	Available
81		ERROR:	Channel 81	Not	Available
82		ERROR:	Channel 82	Not	Available
83		ERROR:	Channel 83	Not	Available
84		ERROR:	Channel 84	Not	Available
85		ERROR:	Channel 85	Not	Available
86		ERROR:	Channel 86	Not	Available
87		ERROR:	Channel 87	Not	Available
88		ERROR:	Channel 88	Not	Available
89		ERROR:	Channel 89	Not	Available
90		ERROR:	Channel 90	Not	Available
91		ERROR:	Channel 91	Not	Available
92		ERROR:	Channel 92	Not	Available
93		ERROR:	Channel 93	Not	Available
94		ERROR:	Channel 94	Not	Available
95		ERROR:	Channel 95	Not	Available
96		ERROR:	Channel 96	Not	Available
97		ERROR:	Channel 97	Not	Available
98		ERROR:	Channel 98	Not	Available
99	0
 
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   #12  

Jack@European_Parts

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Has the instrument cluster eeprom been recently modified?
Are you DEF or anyone recovered from a recent DEF in the cluster family?
:p
 
   #13  

nugentp

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Only DEF here is a Leppard currently on the radio !!!

No cluster eeprom mods - the only 'tweak' of note is that I run modified ECU software - its on a spare ECU that I set to 'Immo off' instead of matching with the factory credentials. Its on the list. Saying all that - this cluster range problem came up long before the modded ECU. I know for certain the ECU isn't lying about fuel consumption either. That parameter was left well alone in the tune.

The fuel gauge does not behave consistently - likes to show its stuck around half full most of the time - so I also wonder if one of the sensors is on the fritz and that is the source of the incredulous range estimate. If it wasn't so damn cold I would whip out the meter and go test them both right now.

I will try the cluster reset procedure another time - see if that helps - pull fuse 15 - key on - key off - replace fuse - feels like something stupid is being overlooked or my cluster has a really curious corruption.
 
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