Reverse engineering PIDs

dvim · Sep 18, 2021

Thanks to https://gr-yaris.co.uk/forum/threads/oil-pressure-and-other-info-over-obd.4379/ we now know that selecting Toyota Camry 2020 in OBDLink Android app gives us access to additional sensors.

It is relatively easy to snoop Bluetooth traffic on Android devices from bugreports or even live. So I selected a couple of sensors in OBDLink on continuous monitoring and looked into the BT traffic using Wireshark. Here is a little snippet from the quite verbose conversation:

These are ELM327 microcontroler, that runs inside OBDLink, AT protocol commands. Interesting ones here are:
* ATSH 0007D0 - sets OBD header for all subsequent OBD commands
* 2162 - queries OBD Mode 21 PID 62 and gets 7D8 05 61 62 03 00 00 0 as a response

First three hex digits in the response (7D8) is the ID of the ECU that has sent the response. Next three bytes (05 61 62) I am not sure what they are. And next three bytes (03 00 00) is the actual data that could be interesting.

So here is the short list of OBD Headers, Modes and PIDs that I was able to figure out from the first initial look and from subsequent help of other forum members below:

Sensor	Category	Mode	PID	Header	Formula	Diag Command
This item indicates that the parking brake is "ON/OFF"	Navigation System	21	62	7D0	BIT(A:1)
Accelerator Position	Engine	221	059	700	(A-41) / 1.42
Engine Oil Pressure	Engine	221	074	700	(((A256)+B) 10) / 128
M/T Oil Temperature	Engine	221	638	700	A + B/256 - 40
+B Voltage	Combination Meter	221	021	7C0	A/10
Fuel Input	Combination Meter	221	022	7C0	???
Sub Fuel	Combination Meter	221	023	7C0	???
Fuel Pressure (High)	Engine	221	F6D	700	???
Fuel Pressure (Low) / Fuel Pressure 2	Engine	221	F6D	700	???
Intake Manifold Absolute Pressure	Engine	221	F87	700	???
Low Fuel Pressure Sensor	Engine	221	0CD	700	???
ExDID_1BE1	Engine	221	BE1	700	???
ExDID_15F7	Engine	221	5F7	700	???
ExDID_1F07	Engine	221	F07	700	???
Tire ID 1 Pressure	TPM	221	005	750	B * 0.01373	atcea2A atta2A
Tire ID 2 Pressure	TPM	221	005	750	D * 0.01373	atcea2A atta2A
Tire ID 3 Pressure	TPM	221	005	750	F * 0.01373	atcea2A atta2A
Tire ID 4 Pressure	TPM	221	005	750	H * 0.01373	atcea2A atta2A
Tire ID 1 Temperature	TPM	221	004	750	A - 40	atcea2A atta2A
Tire ID 2 Temperature	TPM	221	004	750	B - 40	atcea2A atta2A
Tire ID 3 Temperature	TPM	221	004	750	C - 40	atcea2A atta2A
Tire ID 4 Temperature	TPM	221	004	750	D - 40	atcea2A atta2A
Tire ID 1 Position	TPM	222	021	750	LOOKUP(A::1=FL:2=FR:3=RL:4=RR)	atcea2A atta2A
Tire ID 2 Position	TPM	222	021	750	LOOKUP(B::1=FL:2=FR:3=RL:4=RR)	atcea2A atta2A
Tire ID 3 Position	TPM	222	021	750	LOOKUP(C::1=FL:2=FR:3=RL:4=RR)	atcea2A atta2A
Tire ID 4 Position	TPM	222	021	750	LOOKUP(D::1=FL:2=FR:3=RL:4=RR)	atcea2A atta2A
Steering Angle		221	004	7B3	((SIGNED(A)256)+B)1.5
Master Cylinder Sensor Temperature	Brake	221	006	7B0	A-80
Temperature Sensor Value in Coupling	Four Wheel Drive	221	026	7B1	(A*256+B)/128

??? formulas are the tricky part

So this is not much yet, but at least I hope this is enough information for anyone of you to join into this reverse engineering party.

CSV file that can be imported into Torque app for the custom PIDs can be found here: https://github.com/2m/gry/blob/main/exportedPIDs.csv

nightoftune · Aug 22, 2022

Has someone got the TPMS Sensors working with the temperature PID? I tried it multiple times with torque but i dont get pressure or temperature.

Heliomalt · Apr 14, 2024

Or this?

terryo · Sep 16, 2022

reading most of this thread seems to suggest there is no Android application that works "out of the box" for the GR. ive played with ToroquePro but been unable to get the data like intake air temp to display correctly. it appears to be grabbing the wrong data or have the wrong equation. has anyone found a workable Android based solution to get most/all of the GR CANBUS data??

R-power · Nov 11, 2022

dears,
asking this.
(hope it is in topic)

is there a way to log a data?
just to say, rpm in a track session?
in order to check later on how many gear shift up and down near rpm limiter ?

may be used an obd app like a log ?
which <pp and in which way ?

thx so much to anyone

Reyanth · Nov 11, 2022

Torque Pro on android at least.. can log anything you can read from OBD. But I'm sure there are others too, and maybe better ones?

R-power · Feb 9, 2023

dears....

i am having an issue
and ask to this community looking for help
i have used all the PIDS here with torque pro, super
then i have bought canchecked and i am having same info, MAINLY CLUTCH DIFF TEMP
the named "Temperature Sensor Value in Coupling"

now i have added to the car the Syvecs AWD controller (simply remove cables under rear seat from oem awd controller and connect this syvecs)

but unfortunately the "Temperature Sensor Value in Coupling" is disappeared both from canchecked than from torque pro

syvecs says that this info come not from CANBUS but from OBD
they tried several times but they do not understand how fix it, they do not find "the channel, the signal"

do someone may help me
or give me suggestions ?

shall i open a dedicated topic?
and if yes, where ??
thx u all so much for support

here syvecs awd controller

Syvecs AWD / 4WD Controller – Toyota Yaris GR 2020-2023 – Syvecs Powertrain Control

www.syvecs.com

MRA3 · Mar 29, 2023

R-power said:
dears....

i am having an issue
and ask to this community looking for help
i have used all the PIDS here with torque pro, super
then i have bought canchecked and i am having same info, MAINLY CLUTCH DIFF TEMP
the named "Temperature Sensor Value in Coupling"

now i have added to the car the Syvecs AWD controller (simply remove cables under rear seat from oem awd controller and connect this syvecs)

but unfortunately the "Temperature Sensor Value in Coupling" is disappeared both from canchecked than from torque pro

syvecs says that this info come not from CANBUS but from OBD
they tried several times but they do not understand how fix it, they do not find "the channel, the signal"

do someone may help me
or give me suggestions ?

shall i open a dedicated topic?
and if yes, where ??
thx u all so much for support

here syvecs awd controller

Syvecs AWD / 4WD Controller – Toyota Yaris GR 2020-2023 – Syvecs Powertrain Control

www.syvecs.com

Hi, have you found the solution for this issue with Syvecs AWD? I use OBD fusion to see rear diff temperatures and am purchasing the syvecs awd ad don’t want to lose that feature…

khomkolov · Apr 9, 2023

Hello everyone!
is there any way to tell if a car is currently on neutral gear via CAN?
especially when the car is off (no ignition)

AP756 · Apr 19, 2023

Sorry mate, I don't use OBDLink, so I don't know.

Bye for now Fred

CrackFox · May 4, 2023

I'm trying to use obdlink mx+ with racechrono to display the custom pids from the first post. I'm having issues getting racechrono to see any data. The standard pids work fine. What's the trick for pids like the m/T temperature? I've tried to add them as custom pid. With w
Pid and header.

Update:
I had to add 0x to the header value.

black86 · Nov 7, 2023

CrackFox said:
I'm trying to use obdlink mx+ with racechrono to display the custom pids from the first post. I'm having issues getting racechrono to see any data. The standard pids work fine. What's the trick for pids like the m/T temperature? I've tried to add them as custom pid. With w
Pid and header.

Update:
I had to add 0x to the header value.

how are you adding these to race chrono? are you using values from torque pro? or obdlink?

ancyyez1998 · Jul 19, 2023

Can i know the pid for finding odometer and fuel value of toyota yaris

black86 · Nov 7, 2023

Wow! Thank you!! I have a GRC, but everything for the GRY has crossed over, so far. Are those the full equations?

CrackFox · Nov 8, 2023

Heliomalt · Apr 1, 2024

@dvim Is the list in the first post and the csv file up to date, have all the findings and information collected here been updated?

Helmut Eder · Jul 27, 2025

It's been a while now – does anyone have the PID and Formula for Torque that can be insert into Torque Pro? Or the PID and Formula for Turbo Boost to insert into Dashcommand?

Would be very preciate 😊

Reverse engineering PIDs

Syvecs AWD / 4WD Controller – Toyota Yaris GR 2020-2023 – Syvecs Powertrain Control

Syvecs AWD / 4WD Controller – Toyota Yaris GR 2020-2023 – Syvecs Powertrain Control

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