[ice543546]

I have been trying to get data from PT-CAN bus via OBD connector's pins 6 and 14, but only few messages are logged by my reader.

Those messages that i am receiving from OBD PT-CAN are originating from CAN address 130 and are occuring when engine is started, engine stopped and key is retracted etc, but much less information that i would expect for PT-CAN.

questions:

1. is this OBD connector's PT-CAN somehow limited/filtered or am i connecting to wrong pins?
2. does anyone know what messages are sent to NOX sensor (format of dewpoint reached msg etc)? or what messages nox sensor sends back?

basically my NOX sensor broke, i had new one installed and now i am doing a little bit of hobby research how this nox sensor is operating as i have the old one. NOX sensor has CAN bus and i can receive constant messages when i directly connect to it, but i dont know what message is used to really start/enable it (aka dewpoint reached).

[ptpending]

PT-CAN is not routed directly to OBD connector
neither are other buses
the JBE module is working as a gateway/router for these buses
and headunit is working as a gateway from K-CAN to MOST bus for JBE

[ice543546]

Originally Posted by ptpending

PT-CAN is not routed directly to OBD connector
neither are other buses
the JBE module is working as a gateway/router for these buses
and headunit is working as a gateway from K-CAN to MOST bus for JBE

Thanks!

Any good tips where i could tap into PT-CAN with reasonable effort?

[ptpending]

Originally Posted by ice543546

Thanks!

Any good tips where i could tap into PT-CAN with reasonable effort?

if you want to see messages from NOX sensor you have to tap directly between it and DME, because it is communicate directly with DME

[ice543546]

Originally Posted by ptpending

if you want to see messages from NOX sensor you have to tap directly between it and DME, because it is communicate directly with DME

ok, that sounds like a plan, thanks! i am also planning to cut the sensor plug part open to see if there would be indications why it failed.

[ptpending]

Originally Posted by ice543546

ok, that sounds like a plan, thanks! i am also planning to cut the sensor plug part open to see if there would be indications why it failed.

the nox emulator author website contain a lot info about this,
https://bimmerprofs.com

[robin48gx]

Hi I have connected a raspberry pi with an SDS CAN hat to the NOX sensor on a bench. It is sending out CAN bus with STD frames

can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3A F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3A F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 35B [8] 07 31 00 00 00 00 00 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3E F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3E F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3E F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 35B [8] 08 36 00 00 00 00 00 00
can0 130 [8] 03 DE 04 3E F8 10 0A 52
can0 130 [8] 00 00 00 00 A0 C8 0C 00
can0 130 [8] FF FF FF FF 00 00 40 00
can0 130 [8] 03 DE 04 3E F8 10 0A 52


Is there a document on how to command this sensor to start reading/warming up ?

[hs3049]

Originally Posted by robin48gx

hi i have connected a raspberry pi with an sds can hat to the nox sensor on a bench. It is sending out can bus with std frames

can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3a f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3a f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 35b [8] 07 31 00 00 00 00 00 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3e f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3e f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3e f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 35b [8] 08 36 00 00 00 00 00 00
can0 130 [8] 03 de 04 3e f8 10 0a 52
can0 130 [8] 00 00 00 00 a0 c8 0c 00
can0 130 [8] ff ff ff ff 00 00 40 00
can0 130 [8] 03 de 04 3e f8 10 0a 52


is there a document on how to command this sensor to start reading/warming up ?

can id 16進数データ (温度部分) ケルビン (k) 摂氏 (°c)
130 03 de 990 k 716.85°c
130 04 3a 1082 k 808.85°c
130 03 de 990 k 716.85°c
130 04 3a 1082 k 808.85°c
35b 07 31 1841 k 1567.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
35b 08 36 2102 k 1828.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c

[hs3049]

Originally Posted by hs3049

can id 16進数データ (温度部分) ケルビン (k) 摂氏 (°c)
130 03 de 990 k 716.85°c
130 04 3a 1082 k 808.85°c
130 03 de 990 k 716.85°c
130 04 3a 1082 k 808.85°c
35b 07 31 1841 k 1567.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c
35b 08 36 2102 k 1828.85°c
130 03 de 990 k 716.85°c
130 04 3e 1086 k 812.85°c

When converted to hexadecimal, it turned out like this. 35B might be the temperature before the turbine.