How to monitor CAN BUS data with cheap ELM327

October 14, 2016

The main purpose of the ELM327 is not bus sniffing but you can configure it to monitor CANbus messages.

 

The official data sheet 

 

Setting up an ELM327 for sniffing:

 

//Reset ELM327 device

ATZ

 

//Set default settings

ATD

 

//Set echo OFF

ATE0

 

//Set CAN protocol SAE J1939 CAN (29 bit ID, 250* kbaud)

ATSPB

 

//Set spaces OFF

ATS0

 

//Set linefeed OFF

ATL0

 

//Set long messages ON 

ATAL

 

//Helps to start monitoring mode for some ELM327 devices

ATPBC001

 

//Set header ON

ATH1

 

//Start monitoring

ATMA

 

 

Some elm327 adapters and some vehicles does not support monitoring mode. Typical error is when dongle return "SEARCHING..." message and stuck. 

 

 

 

As output you will some thing like that:

 

RAW can bus data:
19:38:26.988 39A80000000000022
19:38:27.004 45D000000000000EF
19:38:27.005 217250C066600FF00
19:38:27.006 2573900C00ED80715
19:38:27.007 39700800000908040
19:38:27.008 293000A27FF500007
19:38:27.008 28000000306006735
19:38:27.009 3B96E3885C86E1480
19:38:27.098 2A600C800BA00C018
19:38:27.198 20BC30487FF040000
19:38:27.199 24BC8C83DF4000000
19:38:27.199 2947C6CC801800080
19:38:27.200 2CB0000280007FF87
19:38:27.201 3CF90000000000000
19:38:27.201 255B60F130063B483
19:38:27.202 215C3FFC3B53BFF93
19:38:27.203 255B68E13006BB5C3
19:38:27.203 295243D005DFCB583
19:38:27.204 2B5000001FF040000
19:38:27.205 3150016140000EC27
19:38:27.205 422000000000000F1
19:38:27.286 29B3FF60070209300
19:38:27.505 4F80016072B07FC08
19:38:27.506 2172504066600FF00
19:38:27.506 3370AE03F00000000
19:38:27.507 45748FE3960069300
19:38:27.508 45D000000000000EF
19:38:27.508 397008000009180C0
19:38:27.509 2A600C800BA00C018

 

Usual cheap elm327 dongles has very limited message buffer, it's means you will get "BUFFER FULL" error message very often. So you'll have to restart monitoring by resending ATMA command.

 

 

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