aim dash,m880, utc

[nappinj]

I can use my utc to talk to my m880 or m880 talks to dash but I cannot have both running or both crash.I have m880 with two 2 can lines tied at can inputs and 100 ohm resister at both the dash and utc. any idea's.

[David Ferguson]

You may have too many terminating resistors. The UTC has a terminating resistor in it, so when plugged it it adds a resistor. Many AIM dashes have built-in terminating resistor (some recent models allow this to be disabled with software), some just have the terminating resistor in the ECU CAN cable (EVO4, XG Log).

Try measuring the resistance across the CAN lines with everything turned off. You can do it at the UTC connector, pins 4 and 5 (which is marked on the connector). If you have 30 ohms or less, you have too much termination, remove some...

[nappinj]

I had none, then 1. then 2 trying to get it to work.

[Stephen Dean]

Are they all set to the same bus speed?

[nappinj]

thanks for the help, it ended up being wrong ecu selected. it was m8xx-m600-m400-m1-v3 I had m500 selected which is CAN speed I think. but it works