DIY Smartphone Scan Gauge - OBD Fusion (4 Viewers)

[Artie]

Can we get tire temps from the TPMS?

 

[FrazzledHunter]

DIY Smartphone Scan Gauge - OBD Fusion

Can we get tire temps from the TPMS?

forum.ih8mud.com

Here's what I did. It's a bit of a pain because on my app using OBDLink I have to connect to the alternate Network C interface which disconnects everything else. I don't use it much.
The PID's are:

• ID <1,2,3,4,5> Tire Inflation Pressure psi
• ID <1,2,3,4,5> Temperature in Tire F

My display:	Displays match the dash:

Connection to Network C:

 

[FrazzledHunter]

What I'd like to do is monitor the standard PID's on the main network and the TPMS PIDs on Network C.
We have 2 cell phones on trips but the dongle to the OBD port only supports 1 connection.
Hmmm...what to do...
I know! What I need is a OBD computer "Y" splitter that provides 2 OBD ports from the one!
Of course it would have to be completely transparent to the main OBD port; e.g. not draw too much power etc...
That's it!
Does such a thing exist?
Anyone go down that rabbit hole?

 

[FrazzledHunter]

Search and ye shall find LOL!

bbfly-A9 OBD II OBD2 16 Pin Splitter Extension 1x Male and 2X Female Extension Cable Adapter (2FT/60CM)
Amazon.com - https://www.amazon.com/bbfly-A9-Splitter-Extension-Female-Adapter/dp/B0711LGRGQ/ref=sr_1_5

 

[Artie]

DIY Smartphone Scan Gauge - OBD Fusion

Can we get tire temps from the TPMS?

forum.ih8mud.com

Here's what I did. It's a bit of a pain because on my app using OBDLink I have to connect to the alternate Network C interface which disconnects everything else. I don't use it much.
The PID's are:

• ID <1,2,3,4,5> Tire Inflation Pressure psi
• ID <1,2,3,4,5> Temperature in Tire F

My display:	Displays match the dash:
View attachment 3723003	View attachment 3723006

Connection to Network C:
View attachment 3723004

Very helpful, thanks! I’ll mess about with this soon.

 

[FrazzledHunter]

Very helpful, thanks! I’ll mess about with this soon.

It's my inderstanding that the entries in the computer's array for each tire can be mapped to any tire with software (techstream?). So whereas my ID 1 for pressure and temperature was my front left, yours might not be.

So what I did was deflate the tires starting with the spare and then checked which one showed the lowered pressure.

 

[Artie]

It's my inderstanding that the entries in the computer's array for each tire can be mapped to any tire with software (techstream?). So whereas my ID 1 for pressure and temperature was my front left, yours might not be.

So what I did was deflate the tires starting with the spare and then checked which one showed the lowered pressure.

I was able to mess with it today and saw what you’re talking about.

The major bummer is you can’t have the TPMS data along with the trans temp stuff since it’s on a different network and the trans temps take priority over tire temps. I have ARB TPMS on my Linx and it shows both temp and psi which is handy. Oh well, as long as psi stays stable I’m good to go but I’m always curious about my rears while I tow with my all big and fat Cruiser.

 

[FrazzledHunter]

I was able to mess with it today and saw what you’re talking about.

The major bummer is you can’t have the TPMS data along with the trans temp stuff since it’s on a different network and the trans temps take priority over tire temps. I have ARB TPMS on my Linx and it shows both temp and psi which is handy. Oh well, as long as psi stays stable I’m good to go but I’m always curious about my rears while I tow with my all big and fat Cruiser.

The problem for me is that when I mess with OBD Link while driving it inevitably causes my wife, for some reason, to start hollering about keeping my eyes on the road. So I taught her to mess with OBD Link. Jot down a few temp vs. pressure measurements. You might find it's pretty linear.

 

[hbar]

Jot down a few temp vs. pressure measurements. You might find it's pretty linear.

Ideal gas law FTW!

PV = nRT

 

[hbar]

hopefully this hasn't already been discussed....

I started building out my own dashboard this afternoon, and I discovered (at least) two things. First, when it's in Park the widget shows me in 8th gear, and when I'm in 8th it shows that I'm in 9th. I put it into manual stick mode just to be sure I didn't actually have a 9 speed (shock: I don't). I don't remember how Reverse showed up in the widget, but all the other gears appeared to be more or less correct. I don't think it jumped from 7 to 9 so I may have to investigate exactly what is going on with it. Has anybody else run into this, or am I using the wrong PID or something?

 

[linuxgod]

hopefully this hasn't already been discussed....

I started building out my own dashboard this afternoon, and I discovered (at least) two things. First, when it's in Park the widget shows me in 8th gear, and when I'm in 8th it shows that I'm in 9th. I put it into manual stick mode just to be sure I didn't actually have a 9 speed (shock: I don't). I don't remember how Reverse showed up in the widget, but all the other gears appeared to be more or less correct. I don't think it jumped from 7 to 9 so I may have to investigate exactly what is going on with it. Has anybody else run into this, or am I using the wrong PID or something?

I only have the 6 speed but park is also 8th gear for me. There's probably some explanation for this but I'd chalk it up to "the numbers you see are not actually the gear, but the "gear position". But maybe there's a slightly different PID on the 8 speed that would report it correctly?

 

[FrazzledHunter]

I only have the 6 speed but park is also 8th gear for me. There's probably some explanation for this but I'd chalk it up to "the numbers you see are not actually the gear, but the "gear position". But maybe there's a slightly different PID on the 8 speed that would report it correctly?

I would love to know what those numbers mean but haven't been able to find docs about it anywhere.

 

[linuxgod]

I would love to know what those numbers mean but haven't been able to find docs about it anywhere.

As a programmer, I'm guessing it's just an array position, and the MID converts it to gear #, P, N, D, R, etc. OBD Fusion is just reading the number floating on the CAN bus and displaying it.

 

[FrazzledHunter]

As a programmer, I'm guessing it's just an array position, and the MID converts it to gear #, P, N, D, R, etc. OBD Fusion is just reading the number floating on the CAN bus and displaying it.

Also (former) programmer here...I thought it might be some ORing of some bits in a word. I'd find it frustrating if I had a 6 speed and it showed 8 for the top gear. But then again, we don't know the definition. Just spitballin' ... BIN 1000 could mean highest gear and for the 2016+ that's DEC 8 and happens to make sense.

 

[hbar]

Also (former) programmer here...I thought it might be some ORing of some bits in a word. I'd find it frustrating if I had a 6 speed and it showed 8 for the top gear. But then again, we don't know the definition. Just spitballin' ... BIN 1000 could mean highest gear and for the 2016+ that's DEC 8 and happens to make sense.

Yeah, would be fun to see the raw data to know what's going on here. I did also notice that the gear itself isn't confined to be an integer. If you add decimal places you will briefly see numbers other than zero to the right of the decimal. Makes me think it's actually some sort of input/output ratio calculation, since it shows the "in between" gears. Maybe I should graph it vs time to see how close to a step function it actually is, or if there is something like a 500msec transition between shifts.

 

[FrazzledHunter]

Yeah, would be fun to see the raw data to know what's going on here. I did also notice that the gear itself isn't confined to be an integer. If you add decimal places you will briefly see numbers other than zero to the right of the decimal. Makes me think it's actually some sort of input/output ratio calculation, since it shows the "in between" gears. Maybe I should graph it vs time to see how close to a step function it actually is, or if there is something like a 500msec transition between shifts.

This reminds me of my job where I sometimes had to analyze raw telemetry from satellites in hex. I'm getting a serious case of the shakes.

 

[hbar]

Yeah, would be fun to see the raw data to know what's going on here. I did also notice that the gear itself isn't confined to be an integer. If you add decimal places you will briefly see numbers other than zero to the right of the decimal. Makes me think it's actually some sort of input/output ratio calculation, since it shows the "in between" gears. Maybe I should graph it vs time to see how close to a step function it actually is, or if there is something like a 500msec transition between shifts.

Interestingly, I currently have 2 gear widgets on my dashboard. I vaguely recall that the initial range setting was 0-7.5 on one of them, and that particular one shows 8 when the other one shows 9. It also jumps from 7 to 9. Looking at the styles of those widgets post-setup, it's not immediately obvious what the differences are in terms of range.

I also graphed the gear changes, and there is a slight slope to them, so it's not quite a step function bound to the integers. That or the resolution of the graph is such that it's just connecting data points and there is enough delta-t between each point to make vertical lines not be vertical. IDK. It doesn't really matter I guess. Curiosity more than anything.


Also, reverse is 14.

 

[mbennett22]

So I have read through the 16 pages and haven't figured out an answer to my issue. I have a 2009 LC and need the transmission temperature. I have installed I believe its linux's dashboards with the A/T temps. They show up on my dashboard but don't work. I have tried to go through and edit the PID but I could never find the transmission in all my scanned PID's. I have sent OBD Fusion an email as well trying to figure out why the transmission isn't displayed on mine. If anyone can help me with this I would really appreciate it.

 

[Jason Andrews]

So I have read through the 16 pages and haven't figured out an answer to my issue. I have a 2009 LC and need the transmission temperature. I have installed I believe its linux's dashboards with the A/T temps. They show up on my dashboard but don't work. I have tried to go through and edit the PID but I could never find the transmission in all my scanned PID's. I have sent OBD Fusion an email as well trying to figure out why the transmission isn't displayed on mine. If anyone can help me with this I would really appreciate it.

The 2 I'm using that worked are under Display Configuration>Toyota, Lexus, Scion>Electronic Controlled Transmission> A/T oil temperature 1 (is pan temp).... A/T oil temperature 3 (is convertor temp)

Are those the ones that you have on your dashboard? I've seen PID's in other categories that didn't seem to work.

 

[linuxgod]

So I have read through the 16 pages and haven't figured out an answer to my issue. I have a 2009 LC and need the transmission temperature. I have installed I believe its linux's dashboards with the A/T temps. They show up on my dashboard but don't work. I have tried to go through and edit the PID but I could never find the transmission in all my scanned PID's. I have sent OBD Fusion an email as well trying to figure out why the transmission isn't displayed on mine. If anyone can help me with this I would really appreciate it.

Did you buy the Toyota Enhances PID pack for your model year? They won’t work without that extra $15 pack