Hi,

Please go easy on the new guy with a stupid question.

I have a 2000 VW Eurovan and I want to get the Transmission Fluid Temperature through the ELM327+Torque Pro.

After going through the translation process to go from the X-Gauge to PID (written by someone here, I apologize that I forgot the thread, so cannot give you proper credit), I had narrowed it down to a PID 0105.

On Torque Pro, I created an extended PID as follows:

PID: 0105
Long Name: Transmission Fluid Temperature
Short Name: TFT
Minimum: 0
Maximum: 200
Scale: X1
Unit: C
Equation: A-40
OBD Header: Blank (and later on “Auto”)
The rest are blank/default

When I hit the “Test” button, it produces 2 responses:

486B104105767D
486B1A41054255

Variable A=118 (hex=76, Binary=blah blah)
Equation Step: A-40
Result: 78

Now I am absolutely certain that the first response 486B104105767D is for engine coolant temperature and second response 486B1A41054255 is for the transmission fluid temperature.

The value A seems to be the hex value of the next-to-last byte, 76 in this case. To get the correct transmission fluid temperature, I need to get the equation to use the same byte for the second response, i.e. 42.

The problem is, no matter what I tried, the equation always picked the byte from the first response so what I really got is the coolant temperature, not the transmission fluid.

I tried the OBD2 header TCM, but that gave a “NO DATA” response on Torque. A blank header or Auto header will again default to the coolant temperature.

What am I missing here? It’s so frustrating to get so close only to be stuck

Thank you and sorry for the lengthy post.

PID: 0105
Long Name: Transmission Fluid Temperature
Short Name: TFT
Minimum: 0
Maximum: 200
Scale: X1
Unit: C
Equation: A-40
OBD Header: 681AF1
The rest are blank/default

or

PID: [fc0105]
Long Name: Transmission Fluid Temperature
Short Name: TFT
Minimum: 0
Maximum: 200
Scale: X1
Unit: C
Equation: A-40
OBD Header: Blank (and later on “Auto”)
The rest are blank/default

And what answers in test mode

Cintakc,

In both instances, Torque responded with a question mark.

Capp777,

What is RX addressing? I think that’s what the Scanguage used with their RXF entry.

Thank you both again for helping.

Capp777,

Thank you for the explanation. That sounds promising and I will try it as soon as I am done with taxes today before the IRS comes knocking

Regards

Did you try the header I suggested
earlier?

I thought I had read before that Ian
was saving the extra responses. Might
try running TorqueScan to see if it is
assigning an id that could be referenced
in the pid editor.

Edited.

There are Elm327 commands for filtering
or monitoring for specific responses. Not
sure if it will work without impacting
Torque’s polling of data.

ATMT
ATMR
ATCRA (CAN Specific)

Come to mind. You might want to read up
on these to see if they could help with
getting to the correct response.

Cintakc,

I have Anroid 7.0, but I do not see any setting sections for developers? Thanks.

Capp777,

Wow! I read up on the ELM327DSF doccument, and those commands are real eye openers for me. I am a Mechanical Engineer, not an EE or CS major, so I am kind of hazy, but they are still very illuminating.

Going back to my original post, there are two received messages when we transmit a request for PID 0105

486B104105767D
486B1A41054255

It seems the difference is in the third byte of the headers

486B10
486B1A

If we issue a command ATMR 1A we may be able to select the second response. Is that correct? If so, I have two questions:

1) How do we issue that command in Torque? In the Diagnostic Command field of the Extended PID?

2) Is the command ATMR1A or is it AT MR 1A or ATMR 1A?

Sorry for my ignorance and thanks a million.

Hi Capp777,

Yes, there was a predefined TFT pid 0105 with the OBD2 headet TCM. I did try that but I got a “NO DATA” response.

Hi Cintakc,

My setting displays are nearly identical to yours, except that between “printing” and “about phone” I have “legal information” instead of “developer …”

Is there a different android os for developers?