RPM rev down instead rev up

[rubensx]

Hi mr-sneezy, nice work!! I've a civic ej1 1995 P28 ECU and using a arduino uno and a hc06 as a bridge to torque (simple and not extended sensors) my RPM goes down insted run up!!

I'm using this code (and also use a kerpz code too)

else if (!strcmp(btdata1, "010C")) { // rpm
if (dlcCommand(0x20, 0x05, 0x00, 0x02, dlcdata)) { //Note 2 bytes used here
if ((dlcdata[2] == 255) && (dlcdata[3] == 255)) { //Trap a condition where my test ECU sends 255, 255 when engine is off
dlcdata[2]=0; //Set a 255 value to 0
dlcdata[3]=0;
}
sprintf_P(btdata2, PSTR("41 0C %02X %02X\r\n>"), dlcdata[2], dlcdata[3]);
}
else {
sprintf_P(btdata2, PSTR("DATA ERROR\r\n>"));
}
}

any idea?

[mr-sneezy]

Hi, your the first person to run my code apart from me I think :)

That issue is real odd and I can't explain it off-hand.
If it were me I'd add a debug print statement after
if (dlcCommand(0x20, 0x05, 0x00, 0x02, dlcdata)) {
to serial output the raw values of dlcdata[2] and dlcdata[3] to the IDE serial terminal on my laptop and see what the raw decimal values look like at say 0RPM, 1000RPM & 2000RPM (by the dash tacho if it has one). If they are not strange then it might be Torque having a custom PID for RPM somehow configured, and it's reversed. If I think of anything else I'll let you know.