RE: [opendiag] extra byte in engine speed response

Is this the ISO Checksum you are seeing - from memory the Multiplex
interfaces passes the checksum to the user

If you add up all the data except the last byte, then if it is the checksum
then the low byte of the addition will be that last byte

Cheers

Richard

-----Original Message-----
From: jsavrtka@... [mailto:jsavrtka@...]
Sent: 02 December 2001 17:46
To: opendiag@yahoogroups.com
Subject: [opendiag] extra byte in engine speed response

Hi everyone,

I've just gotten my Multiplex Engineering interface operational on my
Subaru and noticed something odd after sending an RPM request; all of
the responses have three bytes of data.

The first two are the mandated high and low bytes of the RPM, but
what does the third represent? When the engine is shut off, the
third byte is 0xe1 (consistantly).

Any ideas?

jim

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Received on Sun Dec 02 11:53:10 2001