I have made up two custom PID. One was done to change the tank volume from % to Litre. Works excellent.

With the other one I have a problem.

It is meant to show me the cost per trip. Therefore I took the value of “trip distance” and the value of “cost per km” and multiplied it. The result this PID is showing me is plain nonsense. Where did I make the mistake.

[ff1204] value trip distance.
[ff125c] value cost per km

Turned into

[ff1204]*[ff125c] which is showing me nonsense.

Please help.

Regards, Berni

Can someone help me with a custom pid for a on/off display for DPF regeneration .

Quote from admin on June 24, 2016
Hi!

R0 is the ‘raw’ variable (includes part of the response before the A,B,C start). The ABC variables start from the actual data after headers, lengths, ID bytes (etc, etc) are sent depending on the protocol used

But as far as the Nx variables go:

N0 is the same as A
N1 is the same as B
(etc)
for the variable naming thing – it’s basically a replacement for the A,B,C stuff – this is mainly due to the way the parser works. The A,B,C variables will continue to work and I have no plan to stop them being used, though if you get strange results, try with N0, N1, (etc) variables instead

End Quote.

FYI

Thank you,
that I read your topic, but it does not solve the problem of storing intermediate data after turning off the program and start it again, the previous session data will not be saved

I still seem to lack some understanding of the syntax of the PID expression string. I tried:

Drehm,Drehm,63,256*A+B,0,200,Nm,7E2
U/min,U/min,0C,(256*A+B)/4,0,9000,U/min,7E2
Power,Power,63,(256*A+B)*VAL(“U/min”)/1000,0,200,kW,7E2

Drehm and U/min seemed to give me fair values, but Power does not. It seems that the “/1000” part is ignored, the numbers are too high at least by a factor of 1000. Do these operators need space characters around them?

What is about the PIDmode column? Can it be omitted in something like:

Power,Power,,VAL(“Drehm”)*VAL(“U/min”)/1000,0,200,kW,7E2

?
What is about the header column? Is it needed here, and for what? What values should be given (https://en.wikipedia.org/wiki/OBD-II_PIDs does not give them)? Can it be omitted, say:

Power,Power,,VAL(“Drehm”)*VAL(“U/min”)/1000,0,200,kW,

?
Also, what does the [] operator do? (In my case, returns zero):

Power,Power,,[0C]*[63]/1000,0,200,kW,

What is the purpose of this operator, as I can not supply the “(256*A+B)” which is actually part of the PID?

Also I am not clear about quotation. I have tested a csv which hat quotes around every field, like

“Actual Engine Torque”,”ActEngTorq”,”2149″,”(D * 256 + E) – 32768″,”0″,”150″,”Nm”,”7E0″

and it worked. How does this affect the argument of the VAL function? Writing
“VAL(“Drehm”)”
does not seem correct, what about
“VAL(\”Drehm\”)”
? Should I write these quotes also in the case, where not every field is enclosed by quotes, like:

VAL(\”Drehm\”)

? The problem is, it is difficult to test all this systematically as I have to drive the car to get a readout and if I don’t I don’t have an error message.

@andreas214

I am no expert, but do have some small custom csv files set up for detailed diagnostics on particular systems on my 2004 Ford F150 5.4L 3 valve engine, such as the variable valve cam timing.

Without specific knowledge, I recommend leaving the header line – and I know it does NOT effect Torque. If nothing more its good for memory refresher when modifying or adding additional lines. It even places nice column headers on the first line when imported into Microsoft Excel.

The important thing is EACH field must be separated from the next by a comma. Thus, if you leave out Mode & PID you have to use two commas before beginning your formula. (Leaving out the MODE/PID in this manner will make your Long Name, for all practical purposes function like a public memory variable. As with all variables, like @Capp777 mentioned, spelling must be exact including upper/lower case, and be careful not to use one that has already been used – ie: possibly “Power”.)

Some software ignores quotes enclosing each field – and some require it. Torque does not seem to care, so the Quotes surrounding your formula seem to be just get ignored. But you DO need both MODE (ie: 22 or 21) in your Mode/PID field. ie: 220004 for engine load.

The operator [ xx ] is the instantaneous reading of the PID represented by xx – (WITHOUT Mode, just the raw PID, say: 04 for engine load or OD for vehicle speed, or 16CD for the PCM’s requested cam retard in the case of MY vehicle.)

As @Capp777 said – VAL requires braces enclosing the target PIDs LONG NAME – without any quotes.

Perhaps you can get some ideas from my actual csv file for my Variable Valve Timing diagnostics that follows in its entirety between the dashed lines. You will note that I use two variables (without Mode/PID) for running an accumulator of CAM ERR samples. On a smooth working VVT system, it bobbles above and below Zero degrees. Accumulating TOO high positive or negative indicates over advance or over retard condition respectively.

//// EDIT — Uh Oh — the special characters bit me. Edited to make a link to a JPG file instead.

BTW: Credits to Capp777 for telling me how to construct function memory variables as are used in the above example. Thanks again Capp777

Hope this helps sort it out a little more

——————

54371019

[XX] – returns the value of a PID, where XX is the ID of the OBD2 sensor. i.e. [0d] (speed) or [ff1001] (gps speed)
/div>

That seems resaonable to me. I wanted to test whether the ModeAndPID and header can be ommited in this case:

1 ICE Drehm,ICE Drehm,,[ff1225]*1.3558,0,200,Nm,
1 ICE Drehm1,ICE Drehm1,ff1225,[ff1225]*1.3558,0,200,Nm,Auto

The result is utterly confusing to me. The reading of “1 ICE Drehm” is higher by the factor 1.3558 than “1 ICE Drehm1”.

Is the expression “[ff1225]*1.3558” ignored in the second case?

Cheers

Hello!

Is it possible to introduce some function which uses results of previous PIDs to update PID command itself? That is change
some bytes in PID to bytes calculated from previous PIDs answers?

I think it would be interesting in many cases

I mean the possibility to change ModeAndPID part using some data from answer from previous request. Currently the length of PID can be more then 5 bytes. So the first 2 bytes may be constant and next bytes could be updated using bytes from answer to some previous PID.

Quote from Vasilich on April 5, 2014
The custom PID edit window mentions A<8 in its example string, and after testing it I confirm that Torque supports shift operators x<n and x>n in equations.

hi
i need help getting pro to work were do i post
thanks