I have successfully connected a terminal android app to the obd port of my car. And tried dry run of many at commands, many are working as expected.

But ATMA (AT command to Monitor All) is not responding. Trying to view all the can communication.

Whenever this command is sent via terminal app, the response provided is OK and then again prompt for next command.

Any thing i am missing here?

edit1- car is ford figo diesel model, connected to ELM327 using this app

  • You are going to need to add more information about your car and the tools you are using.
    – HandyHowie
    Jan 19 '16 at 10:56
  • Is there any update after a year? I'm in the same situation with a bluetooth elm327 clone which works for any other AT command.
    – MaxChinni
    Jan 18 '17 at 22:19
  • The elm device was a cheap duplicate, try using another device. The sofware version by my device was shown as 2.1 but i believe thats exaggerated.
    – vinay
    Jan 19 '17 at 4:39

Did you set the protocol for the chip to monitor on? e.g. ATSP5 for KWP-2000 or ATSP0 for "best guess". What about checking the headers as well - ATH1?

I use the following string of commands to monitor my full KWP bus, which is obviously different from CAN, but is similar enough that it might be of use:

ATI -- check connection from app to scan tool

ATH1 -- Print headers

ATAL -- Allow "long" messages ( > 7 bytes)

ATSP0 (or ATSPX, where X is the protocol number) -- Sets the protocol. 0 is "guess"

ATMA -- Monitor all

You may have also bought a clone of the ELM327 chip - I have found, from personal experience, that a lot of the cheap clones do not offer the full command set. It would have to be a very very bad clone for it not to suppose ATMA!

  • all commands executed but no luck - imgur.com/oQbs3SZ
    – vinay
    Jan 20 '16 at 9:41
  • ATAL has been part of core ELM327 commands since version 1.0, so the ? after you run the command - to me - would indicate a cheap knockoff. This would also explain ATMA not doing what it's suppose to. If it's a real ELM327 chip, you should get something back from at@1 and at@2. Out of interest, how much did you pay for the scan tool? If only a few bucks, it's probably a fake - wholesale price of an ELM327 chip alone is about 10 USD.
    – Nick
    Jan 20 '16 at 10:30
  • Addendum: I had very similar problems to you wrt cheap knockoffs. I got two different bluetooth scanners from a well known cheap site, and both of them only support subsets of the commands (and poorly at that). One of them didn't support warmup messages and the other one wouldn't support setting the headers. Oddly enough, the USB scanner I got from the same site, whilst a clone, supported all the commands I needed... the mind boggles.
    – Nick
    Jan 20 '16 at 10:37
  • seems like mine is cheap clone with basic functionality. @1 and @2 commands are provided with response.
    – vinay
    Jan 20 '16 at 13:11
  • I would stronlgy recommend to use ATTP5 instead of ATSP5. Read the ELM327 datasheet.
    – Elmue
    May 23 '20 at 4:42

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