370z CAN Bus Data & Question?

MotorvateDIY

Mini Update:
This afternoon was fun...
By sending out CAN bus data, I can now fully control the instrument panel:


Tomorrow, I will re-verify today's work, just to make sure all is accurate.

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gbrettin

I sent a message to you on Facebook.

Sent from my SM-G975U using Tapatalk

MotorvateDIY

Since my last post, I have an additional 30+ hours reverse engineering the gauges. I really don't know what is wrong with me, but I LOVE this type of work!!


On the CAN bus I have found:
Paddle shifters (up & down), outside temp, all of the LCD images (middle of the G37 gauges), all of the warning lights, driver & passenger seat belt buckle status,
and two very interesting ones:

• Amount of fuel consumed since engine start
• Raw data of the fuel level float. I had no idea how much those float arms move!!

To give you an idea of the scope of the task here is some simple math:
Each ID the gauges receive typically have a payload of 8 data bytes.
That 8 bytes can be 8 values for an analog sensor, or 64 bits used for switch (lights on) or system status (engine off, engine running)
-OR- any mix of the above.

Now that was for a single CAN ID, most modules receive data from multiple IDs and the only way to find out, is to send specific data to a specific ID and see what happens.

In the next few days I will have some CAN logs from a 370z and will feed it to my G37 gauges. I am 99% certain everything will work as I would think the encoding is the same.

By the way, while sending speedometer data to the gauge cluster to figure out the "fuel consumed" my odometer went up just over 320 KM / 199 miles while on my desk!

madwi

Very nice! Thanks.

gbrettin

That's very cool!

MotorvateDIY

Just having a little fun & re-verifying the CAN bus commands:
(I do have some 370z logs on their way to me and I expect them to me mostly the same and should work with both gauge clusters.
I will give an update after the analysis is done)

SeeThruHead

you can record my can bus if you want.

also this guy has some stuff on his blog
https://projectbytes.wordpress.com/2...z-can-hacking/
https://www.dropbox.com/s/cfpzb2mpj4...0CAN.xlsx?dl=0
also this
https://github.com/rampage128/niscan

https://github.com/rampage128/cardro...ontroller.java
maybe this can help too

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MotorvateDIY

Thanks for the links... I think I have already read them, but I will double check.

I will send you a PM about logging CAN bus data.
Thanks for the offer!!

MotorvateDIY

Small update:
Thanks to a tuning shop in Poland, I have some 370z logs -AND- when I played them back on my G37 gauges, everything worked as expected!!

There are more 370z logs on their way to me and I will verify them against my G37 logs.

All of this will allow different engine swaps to have functioning stock gauges
and it will also allow the required ECU data to be translated and sent to different transmission control module, like the wonderful ZF 8HP for proper integration and function.

When I have looked at the other CAN logs, I will update the thread here.
If there is enough interest, I could put together and episode or two on how to get started with Nissan/Infiniti's (or any) CAN bus.

THE BULL

Bump for this.

gbrettin

I am so damn excited about this!

Uxi

Any updates?

Kinda hoping to get something going to replace the left dot gauges with more useful info, especially having TPMS, temp, time, MPG, etc all in one little screen.

MotorvateDIY

YES!

Unfortunately, I created multiple threads so the updates are in a few places.
Here is my attempt to get everything into one thread:
LCD Gauge Update #3: 35 Data Items on 16 Pages!

TL;DR
https://youtu.be/lndZiRxDNOo

INV_MY_370

I found few ways to do complete scan and ways to send raw commands with the elm Bluetooth devices

If anyone knows the command that can be sent to clear the low tire light. Let me know please. I have already been able to do the basic, like honk the horn and headlights. Even the wippers.

MotorvateDIY

Since you are using an ELM327, you must be using UDS (unified diagnostic services) commands... good work! Did you reverse engineer them from a scan tool, or use that UDS spreadsheet that is floating around?

There is a CAN bus message that turns on/off the TPMS light and this is sent by the BCM depending on the TPMS status.

You might think that all we need to do is to send the command to turn off the TPMS light, but that won't work.

Here is why:
The BCM is also sending the command to have the light turn on 10 times per second.

Unfortunately, the result is an unpredictable / flickering TPMS light.
We can't have 2 devices sending opposing commands.

Turning off the TPMS light is something we have been working on for the last year and will be testing 2 different solutions on my G37 this fall.

One is an RF solution (simulates TPMS data) and the other is via the OBD port.
I'm sure many people would like to turn that TPMS light off... I know I want to!