OBD logging and real-time histogram

[NSFW]

PCM Hammer includes a primitive logger in Release 11, but I just noticed that it was missing the .profile files that are needed to actually use it. So I just added them to the zip file:

https://github.com/LegacyNsfw/PcmHac.../2019.12.30.01

There's no real-time histogram, but I agree that would be a good idea. For now, you'd have to post-process the .CSV file in another tool. Excel could probably do it.

Also, it would really benefit from more / better profiles (lists of parameters to log). It's pretty straightforward to create profiles using SAE PIDs, if you're comfortable editing XML. Logging anything that isn't an SAE PID would require doing some reverse-engineering to find the memory location of the parameter you want... that's more work, but I'm sure we'll hunt down the most useful parameters over time.

[steveo]

if you're using an ELM chip try tunerpro with the ELM plugin. its 'history table' will pretty much do what you ask, i think.

[woody80z28]

I just bought a USB cable and couldn't get it to work. The driver said something about being phased out in 2012 and I couldn't get it to assign as a COM port. Would not recommend it:
https://www.amazon.com/dp/B081S15H7R

In related news...has anyone been able to log in TunerPro via an OBDLink? LX ideally? I'm logging in torque, but it leaves a lot to be desired.

[woody80z28]

Looking like this will work via OBDlink in TunerPro. It connects on my bench, will try it in the truck tomorrow.

Anyone know how to add EGR position to the datastream? That's where I'm wiring in my wideband 0-5v.

According to a post from 2009 I found it's PID.2811
https://ls1tech.com/forums/pcm-diagn...l#post11938549

[woody80z28]

It works! I had to build some lookup tables to convert C to F and KPH to MPH, etc...but it works. LTFT was showing 128 like obd1 so I converted that to 100 to show percent. Overall I'm happy with it.

"VN5000" is the original author of the ADX according to the header. I searched and didn't find any info on that name.

I attached an ADX capture to show the code for the PID. That's way over my head. Anyone have an idea how to code for PID.2811 to get EGR voltage in the datastream so I can do the wideband conversion?

[woody80z28]

Found a hex converter online and the byte string for KPH translates to M01P0D501R1. Did I mention that part is over my head? Haha

[woody80z28]

Ok I found this thread and it was very helpful:
http://www.gearhead-efi.com/Fuel-Inj...-OBDII-plug-in

Wiki also shows the PID info here:
https://en.wikipedia.org/wiki/OBD-II_PIDs

So, we know vehicle speed is:
0x4D 0x30 0x31 0x50 0x30 0x44 0x53 0x30 0x31 0x52 0x31 =
M01P0DS01R1=
'M' + HH + 'P' + HH + 'S' + HH + 'R' + H
Where 'M' is for Mode, "HH" is two hex ASCII bytes (e.g. 'F' 'F' for 0xFF). 'P' is for PID, 'S' is for size of PID data reply, and 'R' is for reply count. Note that the 'R' data is a single hex digit (e.g. '2').
= Mode 1 PID 13, get only 1st reply

So for PID 2811 I'm thinking: M01PAFBS01R1 (hopefully 3 hex bytes is not a problem and it still figures the delineation via the S after it for the size packet)
0x4D 0x30 0x31 0x50 0x41 0x46 0x42 0x53 0x30 0x31 0x52 0x31