Autronic SM4 User Selectable Data

[HamR]

I have a Dash2 Pro connected to an Autronic SM4 successfully reading almost all of the datastream. The SM4 is using the 1.09 datastream syntax and I have fuel pressure and oil pressure displaying correctly in the Autronic UI, but only resolving to zeros in the Dash2 Pro. The channels have been added to two of the four user defined variables of the outbound datastream (each as bar pressure) and are assigned to Aux1 and Aux2 variables (display as %). All other variables from the datastream resolve correctly but these both show zeros.

Is it possible to assign the User Selectable Data to the respective fuel and oil pressure variables?

Thanks,
Hamish

[HamR]

Here is a sample packet taken from the actual datastream with the byte number underneath (sorry, HTML ruins the formatting):

24 30 f8 04 42 01 41 01 06 01 00 00 00 00 f8 03 f8 03 00 00 00 00 47 07 c7 00 c7 00 00 00 00 00 00 00 00 00 5a 0d 00 00 00 00 a3 02 78 00 00 00 00 00 f8 f2
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Bytes 44 and 43 in hex are 02A3 which resolves to 0.675 bar (decimal)
Bytes 46 and 45 in hex are 006B which resolves to 0.107 bar (decimal)

So the SM4 is outputting the correct v1.09, 52-byte datastream, I just need help getting the DASH2 Pro to understand the user-defined parts of the datastream.

Thanks,
Hamish

[HamR]

Further to this, I thought I'd spell out how I have the DASH2 Pro configured.

In the ECU Interface screen, I have "SM 109" selected as the ECU and "Port 1" as the serial port. This seems to work fine with the fixed channel translations, so I'm assuming it's correct. I don't plan to output the serial data, so I'm okay with using port 1.

For input 18, "User selectable channel 1" I've left it mapped to "Lambda 1 short trim [aux 2]..." and the channel is enabled. Similarly, for input 19, "User selectable channel 2" I've left it mapped to "Lambda 2 short trim [aux 3]...".

In the LCD data area screen, in the left most display area, I have "Lambda 1 short trim [aux 2]..." as the variable to display, displaying as %, to four decimal places, slow smoothing and a label of "FUELP". In the middle display area, I have "Lambda 2 short trim [aux 3]..." as the variable to display, displaying as %, to four decimal places, slow smoothing and a label of "OILP".

I've tried using other unused variables, but nothing seems to work. I could just direct a signal wire from the 5v sensors and map them to analog inputs, but reading directly from the ECU leaves the analog inputs free for other testing functions.

Help?

Thanks,
Hamish

[Support]

Hi there,

I have looked into this and can confirm that we are experiencing some issues with decoding these channels from this particular ECU.

We will look into this as soon as possible.

For the time being, I would recommend connecting the sensor to the analogue inputs of the DASH2 PRO so that you are still able to display this as a variable.

Kind Regards,
RT Support (SK)

[HamR]

Thanks for the update.

Is there an approximate ETA for this (weeks, months, other)?

Cheers,
Hamish

[Support]

Hi there,

No problem at all.

We're looking to start development of the new firmware for bug fixes and other improvments to the DASH2 PRO within the next 1 - 2 months. We're currently gathering data on features that other users would like and improvements that can be made in other areas.

Kind Regards,
RT Support (SK)