HEX-NET will not read Engine Codes

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BinsuJiro

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My wife's 2008 Audi A4 Quattro 2.0T was out with my son, and came back with a check engine light.

Upon logging the HEX-NET and my iPhone into the same wireless network in infrastructure mode, I found that the HEX-NET could ONLY read non engine related data. Attempting to read OBDII yielded a # 33 Time out Error after three tries at obtaining the data. The DTCs could not be erased and I have no idea what DTCs there in reality are since Common sensors in the range from 01-Engine to 03-ABS cannot be read. Running a full diagnostic yields results starting with 08-Auto HVAC to the end of the scan. I tried everything short of disconnecting the A4's battery, because I don't know where the zRadio Code is.

This is the only Audi running now out of three while the two others are waiting for parts. I would like to find out what is throwing the OBDII check engine code.

Here is the last scan, THE ENTIRE SCAN...in reviewing all of the past scans that were still available, I realized that the HEX-NET has not been reading any OBDII data:

Code: 
VCDS Mobile 0.4341.0.4

VIN: WAUAF78E48A1.....

Chassis Type:8E
Scan: 01 02 03 08 09 0F 11 15 16 17 18 36 37 45 46 55 56 57 65 67
	 69 75 76 77

VIN: WAUAF78E48A1.....




-----------------------------------------------------------------
Address 08: Auto HVAC	Labels: 8E0-820-043.lbl
	Part No SW: 8E0 820 043 BM	
	Component:   A4 Klimaautomat   3233
	Coding: 00000
	Shop #: WSC 00000 000
	VCID: 6D9D5AB72C63FF8B4345B30F79-5160

No fault codes found.

-----------------------------------------------------------------
Address 09: Cent. Elect.	Labels: 8E0-907-279-8EC.lbl
	Part No SW: 8E0 907 279 N	
	Component: int. Lastmodul  USA 0907
	Coding: 00003
	Shop #: WSC 06335 000
	VCID: 3D3DAAF73C83AF0BB365A3CFE9-4B00

1 Fault Found:
01494 - Bulb for Parking Lamps; Left (M1)
	30-00 - Open or Short to Plus



-----------------------------------------------------------------
Address 16: Steering wheel	Labels: 8E0-953-549.lbl
	Part No SW: 8E0 953 549 Q	
	Component: Lenksäulenmodul     0801
	Coding: 02141
	Shop #: WSC 06335 000
	VCID: 41C5D607407BCBEBD78DCF1FA5-4B00

No fault codes found.

-----------------------------------------------------------------
Address 17: Instruments	Labels: 8E-17.clb
	Part No SW: 8E0 920 951 N	HW: 8E0920951N
	Component: KOMBI+WFS 4     H14  0200
	Revision: 0200    	Serial Number: 00000000000000
	Coding: 0022268
	Shop #: WSC 08201 444 85739
	VCID: 352DB2D704B3674B7B154B6F41-5184

No fault codes found.

-----------------------------------------------------------------
Address 46: Central Conv.	Labels: 8E0-959-433-MAX.lbl
	Part No SW: 8E0 959 433 CP	
	Component: Komfortgerät T7B    4336
	Coding: 11820
	Shop #: WSC 06335 000
	VCID: 8145960780FB8BEB170D8F1F65-4B00

	Subsystem 1 - 	Part No SW: 8E1-959-801-G
	Component:    Türsteuer.FS BRM 0706

4 Faults Found:
01374 - Alarm triggered by Terminal 15
	35-00 - -


01371 - Alarm triggered by Door Contact Switch; Driver's Side
	35-00 - -


01573 - Alarm triggered by Door Contact Switch; Rear Left
	35-00 - -


00913 - Window Regulator Switch; Front Right Driver (E81)
	27-10 - Implausible Signal - Intermittent


-----------------------------------------------------------------
Address 56: Radio	Labels: 8J0-035-1xx-56.clb
	Part No SW: 8E0 035 195 AF	HW: 8E0035195AF
	Component: R Symphony2+    H01  0270
	Revision: 00H01000	Serial Number: AUZ1Z4G6904208
	Coding: 0210012
	Shop #: WSC 06335 000 00000
	VCID: 6B9954AF1277E2BB5D319D1787-5160

No fault codes found.

-----------------------------------------------------------------
Address 65: Tire Pressure	Labels: 8E0-907-273.lbl
	Part No SW: 8E0 907 273 A	HW: 8E0907273A
	Component: Reifendruck 3   H04  0130
	Coding: 0062121
	Shop #: WSC 06435 000 00000
	VCID: 2A1791ABDD0D3BB3E6A7D0EBD0-5160

2 Faults Found:
01521 - Sensor for Tire Pressure
	002 - Lower Limit Exceeded - MIL ON

01833 - Antenna for Tire Pressure Monitoring; Rear (R96)
	004 - No Signal/Communication - MIL ON
 
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Uwe

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Is it safe to assume that hitting 01-Engine directly also gets you nowhere?

Have you previously been able to get data from the engine in this car?

-Uwe-
 
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BinsuJiro

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I sent the message below, then visited AudiWorld to check on a post there. I noticed that there was a mid-year production split in the A4 in 2008, which started the B8 Chassis run. I went out and tried again and started with a cold engine. Before starting the car I plugged in the HEX-NET, logged into my network, started up VCDS Mobile on my iPhone, started the car and began a session using the B8 Chassis. After doing that I was able to run a full diagnostic, and found the DTC to be an implausible signal regarding the cooling system.

I was able to read the DTC in the appropriate section of VCDS Mobile, checked for pending codes and then cleared the DTC. A second run of the diagnostic yielded no DTCs and no Pending DTCs. I then tested the manual reading section of VCDS Mobile and was able to check individual locations without difficulty. I waited till the engine temperature was up to 77°C and started another diagnostic run. At this point I could not read the Gateway or choose a manuel selection of the Vehicle. I turned the car off and waited 15 seconds. Restarted the car, and was then able to make a manual choice of the vehicle. I stared another diagnostic session to ascertain if I could read locations 01, 02, and 03. All were accessible.

The only remaining question is whether or not the original issue of not being able to read Engine codes was the choice of the B6-B7 A4 Vehicle or a high temperature condition in the car that somehow affected the connection to the engine ECU.

I will report on this when I have the car up to full operating temperature after a trip.

Yes, but only the very first time I ran a diagnostic on it before we purchased the car. At that time I used the HEX-CAN USB device. But, I don't think it is a device related issue [HEX-NET vs HEX-CAN USB], because the HEX-NET device works perfectly on my son's 2008 A6. I cannot recall anything that may have happened that would cause the discrepancy between the use of the one device over the other.
 
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Uwe

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Reflecting a bit on your Auto-Scan and the fact that this is a 2008 A4, it looks like the stuff that isn't talking are the modules on the powertrain CAN bus in that car. Unlike just about every other VW/Audi model that uses CAN for diagnostics, the B7 A4 does not have a proper CAN gateway; instead it exposes the powertrain CAN bus directly at the diagnostic connector. The modules that are talking are all on K-line.. Since you say the HEX-NET works fine on a 2008 A6, I think we can eliminate something like a bad CAN tranceiver in the HEX-NET. So in a likelihood, the powertrain CAN bus in the car is unhappy somehow. Since the Instrument Cluster talks, go there and have a look at MVBs 125 and 126 and let us know what you see there.

-Uwe-
 
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BinsuJiro

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I'll give this a try, but would you please enlighten me on the steps I need to take in order to access that info?
 
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Uwe

Uwe

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In VCDS:
[Select]
[17-Instument Cluster]
[Measuring Blocks]
Look at Groups 125 and 126

In VCDS-Mobile:
[Select]
[17-Instument Cluster]
[Functions]
[Advanced Measuring Values]
Scroll down to the stuff marked [loc 125-1] through [loc 126-4] and select all 8
[Submit]

-Uwe-
 
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