Mode 22 Vehicle Specific PIDs
r0tor 2014-01-05 08:02:31 5585 Views2 Replies I've been successful in adding generic Mode 1 (labeled Mode 0 in the library?) PIDs to the library for various things supported by my Mazda.
I am now trying to figure out a way to query the CAN for Mode 22 vehicle specific PIDs. I've done some research and have found the Tx/Rx CAN commands needed to do this - however I am not sure how to define these in the library. Generically the first 4 characters are for the CAN protocol, followed by the 22 for the CAN mode, followed by a 4 digit PID number
Specifically I'm trying to add the following:
Knock Retard (KR) (in degrees)
TXD: 07E0221746
RXF: 046285170646
RXD: 3008
Wheel Pressure showing tenths place
Wheel 1 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 3008
Wheel 2 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 3808
Wheel 3 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 4008
Wheel 4 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 4808
(Sorry, I'm a mechanical engineer and not a programmer ;) )
I am now trying to figure out a way to query the CAN for Mode 22 vehicle specific PIDs. I've done some research and have found the Tx/Rx CAN commands needed to do this - however I am not sure how to define these in the library. Generically the first 4 characters are for the CAN protocol, followed by the 22 for the CAN mode, followed by a 4 digit PID number
Specifically I'm trying to add the following:
Knock Retard (KR) (in degrees)
TXD: 07E0221746
RXF: 046285170646
RXD: 3008
Wheel Pressure showing tenths place
Wheel 1 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 3008
Wheel 2 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 3808
Wheel 3 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 4008
Wheel 4 Pressure:
TXD: 075122C901
RXF: 046285C90601
RXD: 4808
(Sorry, I'm a mechanical engineer and not a programmer ;) )
2014-01-13 17:09:29 Any example of how to deal with a PID that contains 2 or 4 data bytes? Like a wideband O2 (PID 24) has 4 bytes - first 2 are used to calculate the lambda value and the other 2 calculate the voltage value.
It looks like you have the OBD mode hard coded as a "1" in the library. I changed it to a "22" for my mode 22 PID and seemed to get a response that made sense. However, I think there are 4 bytes for this PID and I'm not sure how to get bytes 2-4.
BTW - I found an error with your PID for coolant temp in the library... needs to use getTemperatureValue(data) instead of getSmallValue(data)
r0tor
It looks like you have the OBD mode hard coded as a "1" in the library. I changed it to a "22" for my mode 22 PID and seemed to get a response that made sense. However, I think there are 4 bytes for this PID and I'm not sure how to get bytes 2-4.
BTW - I found an error with your PID for coolant temp in the library... needs to use getTemperatureValue(data) instead of getSmallValue(data)
r0tor 2014-01-10 16:11:24 BUMP
If its not possible to easily add these to the library - could I get a brief example of how to directly query the CAN system with the PID codes and retrieve the data from my project? r0tor
If its not possible to easily add these to the library - could I get a brief example of how to directly query the CAN system with the PID codes and retrieve the data from my project?
r0tor 