P80 - can VAG-COM cable read DTCs and mileage?

[bugs11]

Not to hijack, but can a VAG-COM cable and VOL-FCR read the internally stored mileage?

I'm assessing my options for communicating with my 96 850 via the OBDS II port. Do I go the ELM327/850diagnostic route or VIDA-VICE or OBD II scanner or VOL-FCR? I just want to read DTC's and get the mileage.

[Ozark Lee]

The cable might be able to read it but VOL-FCR doesn't have a routine written to read it. VIDA/DICE won't do a thing for a pre '99 car other than give you a good parts list. The DICE won't talk to the car at all.

The best route if you want an OBD-II solution to read the actual mileage is the ELM327.

...Lee

[esl_97_850_T5]

bugs11,

1. I know of no one who has programmed the Vehicle Mileage reading yet w/ a VAG/COM KKL cable or hex cable. But it shouldn't be hard for someone that already knows how to program ISO 9141-2 style 5-baud, 10400 baud connections.

2. The cable is certainly physically capable of reading the vehicle mileage via a message represented by the following hex data:

835113B903A3

*or*, if you prefer some spaces for clarity sake:

83 51 13 B9 03 A3

but you first have to establish an ISO 9141-2 style 5-baud, 10400-baud Slow Init connection by sending the ECU address of 51 as the first byte (at 5-baud), then completing the remaining several byte exchange at 10400 baud, where your program will first receive 3 bytes (represented by the hex 55 D3 B0) from the car, then your program and the car will exchange a couple of handshaking validity bytes according to the ISO 9141-2 rules

After waiting about ~0.350 second (after the last byte of the Slow Init exchange) [I believe I'm remembering that number correctly], you can then send the request mentioned initially -- the one represented by 835113B903A3. That's the Vehicle Mileage request.

The response from the COMBI (ECU 51) can be represented by hex similar to what you see in the F903 response in the B903 section:

85 13 51 F9 03 xx yy cs

To determine miles, swap the yy and xx, convert yyxx (as a single hex number) to decimal, then multiply by 10.

km is the calculated miles * 1.609344.

3. The simplest Vehicle Mileage reading solution is presently (like Lee says) to use a KWPD3B0-capable ELM327 device with existing mileage reading software: volvo850diag, mikeri's milageread, XantheFIN's "Volvo 850 OBD-II" app.

esl_97_850_T5

[esl_97_850_T5]

The previous post's comments should be understood to be focused on bugs11's '96 850, and, more generally, any '96-'98 850/S70/V70/XC70 that is handled by the first row of buttons in Vol-FCR -- ie, the 800 Series '96> and S/V 70 ('97-'98) buttons.

esl_97_850_T5

[bugs11]

So... where does one purchase a reliable KWPD3B0-capable ELM327 device?

I don't mind paying a little more for a reliable tool, economy of quality (says the guy driving a 20 year old Volvo).

[esl_97_850_T5]

bugs11,

As of 2016-03-28, for our '96-'98 850/S70/V70/XC70, I recommend Scantool.net devices -- OBDLink SX USB, OBDLink LX Bluetooth, or OBDLink MX Bluetooth -- from their site (or links on their site).

esl_97_850_T5