Controller Area Network

[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.