Controller Area Network

[Ratz]

Originally Posted by CTScott

Low level wise is could be considered J1939 compliant, but it is officially J1987 compliant, uses the SAE J1962 terminal arrangement and high level packet wise is ISO 15765-4 compliant.

Thanks for your quick answer CTScott.

The reason I am asking is I like to install a temperature gauge in my Yaris.

Hooking up a scan tool to a DLC terminal and seeing engine temperature gave me an idea that I may use a temperature gauge compliant with CAN bus signal.

This way I can avoid inserting a temperature sensor in the radiator hose modification or fittings in the engine block and avoid running wiring from the engine compartment. Since I could just tap into DLC terminal wiring or instrument cluster wiring as signal wiring is available in both.

I guess I will send the manufacturer an email and see what they say about SAE J1987 protocol. Specifications state it is compatible with SAE J1939 data protocol.

Here is a link to the gauge I am considering as it has a nice large sweep. I could go with digital gauge but analog grabs ones eye attention faster.

http://www.vdo.com/generator/www/com...n_link_en.html

Any input is welcome.

[CTScott]

Originally Posted by Ratz

Thanks for your quick answer CTScott.

The reason I am asking is I like to install a temperature gauge in my Yaris.

Hooking up a scan tool to a DLC terminal and seeing engine temperature gave me an idea that I may use a temperature gauge compliant with CAN bus signal.

This way I can avoid inserting a temperature sensor in the radiator hose modification or fittings in the engine block and avoid running wiring from the engine compartment. Since I could just tap into DLC terminal wiring or instrument cluster wiring as signal wiring is available in both.

I guess I will send the manufacturer an email and see what they say about SAE J1987 protocol. Specifications state it is compatible with SAE J1939 data protocol.

Here is a link to the gauge I am considering as it has a nice large sweep. I could go with digital gauge but analog grabs ones eye attention faster.

http://www.vdo.com/generator/www/com...n_link_en.html

Any input is welcome.

I don't believe that gauge will work, as the SAE J1939 compliance is at the low level. The communication that allows a device to read PIDs, like the water temp fall under the high level ISO 15765-4 protocol.

[Ratz]

Originally Posted by CTScott

I don't believe that gauge will work, as the SAE J1939 compliance is at the low level. The communication that allows a device to read PIDs, like the water temp fall under the high level ISO 15765-4 protocol.

Too bad, maybe one day everybody will get synchronized and use something like NMEA2000. I sent them an email already, to inquire if their gauge would work with SAE J1987 data protocol, now I am skeptical. Back to the drawing board.