FAULTY ELM 327 INTERFACES DE-MYSTIFIED (READ HERE)

[Psychik]

also I tryied to test my interface inside FES and these are the results :

COMMAND: ATBI
RESPONSE: CAN ERROR
COMMAND: ATZ
RESPONSE: ELM327 v1.3a

looks like it's not working in CAN but I have resistors and capacitors in the right place.. what does it mean..

you should try to remove this two resistors and capacitors.
if you plug elm into slot in yours car and can transmision is broken then yours elm makes disturbance.
in my elm the main problem were this termination resistors/capacitors. they are needed at the phisical begining and phisical end of can network. it's not good to put additional terminator somewhere in a middle of network as you do with this elm.

[Jabbee]

Hi Psychik,

I believe I have the same problem, when I plug in the interface fitted with the 100ohm and 560pf capacitors it imediatley stops the CAN BUS and sends the instrument panel lights and gauges haywire if I remove the plug it goes back to normal but the odometers flash. When I switch the ignition off and back on the system resets.
When I log on to the ABS computer with the Elm interface I get an error code C1522 - ABS to instrument panel data line fault, with the VAG comm lead I get no error code.
I am considering buying another interface to try and eliminate the Elm interface from the fault equation. However I am now considering removing these RC networks (100ohm and 560pf capacitors).

Regards


John B

[tzok]

I've got 2 ELM327 interfaces, both labeled as 1.5a, but they differ even in the way they blink the LEDs during the power init procedure. None of them don't want to connect to my Grande Punto when using SCANTOOL.NET (I've set vendor ID to SCNATOOL.NET via terminal AT@3 command). I've borrowed an identical to one of my own interface from a friend of mine and it worked just fine. All interfaces worked fine with ScanMaster-ELM. Unfortunately I had to give it back before the FES v.2.6 was released. None of mine ELMs did connected using 2.6, but both work with 2.6.1?!? I didn't tried it with registered version, but FREE opened a connection, so I assume it will work (hope so, because I've just bought FES).

[Argo]

I found a quick and dirty solution:

• Bought the cheapest ELM327 interface from eBay (actually V1.4)
• Disassembled and found I had the board below.
• Using a craft knife I carefully destroyed the 120ohm resistor (R04 on the board). Be careful you don't damage R17 just beneath it.
• Resembled and it works a treat!

[cendler]

Argo : thank, me too it works

[yincar]

Hi Yani and all,
My bad interface looks like this. Not sure which version it is. So, do i need to remove R14 and solder 100 ohm resistor and 560pf capacitor like what 1st post did to cure CAN issue?

yincar

top side

ELM_top.jpg (113.25 KiB) Viewed 165310 times

[ivica21]

Yes.And then your can line will work.

[sam29]

I found a quick and dirty solution:

• Bought the cheapest ELM327 interface from eBay (actually V1.4)
• Disassembled and found I had the board below.
• Using a craft knife I carefully destroyed the 120ohm resistor (R04 on the board). Be careful you don't damage R17 just beneath it.
• Resembled and it works a treat!

Thanks to all of you for helpful.

I bought Bluetooth (BT) ELM 327 from e-bay.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... K:MEWNX:IT

It is written that its 1.5 but actually it is 1.4.

When I connect it to my car, it works fine with my laptop and android phone.

However when I connect it to my N900, it immediately disconnect.

I opened the log files of N900 and discovered this

libobd[INFO](obdcon_opendev:174): Connected to serial "/dev/rfcomm0"
libobd[INFO](obdchan_setup_channel:95): Trying ELM ...
libobd[RAW_DATA]: Sending to ELM -> 'AT|'
libobd[RAW_DATA]: Recieved from ELM -> 'AT|?||>'
libobd[RAW_DATA]: Sending to ELM -> 'ATZ|'
libobd[RAW_DATA]: Recieved from ELM -> 'ATZ|||ELM327 v1.4||>'
libobd[RAW_DATA]: Sending to ELM -> 'ATE0|'
DEBUG [10:12:12.163134] trip.c:0155 - Saving trip data: (obd: 0 0) (gps: lat:0.000000 lon:0.000000 alt:0.000000 d:-1.000000)
libobd[RAW_DATA]: Recieved from ELM -> 'ATE0|OK||>'
libobd[INFO](obdchanelm_setup:463): ELM echo disabled
libobd[RAW_DATA]: Sending to ELM -> 'ATL0|'
libobd[RAW_DATA]: Recieved from ELM -> 'OK||>'
libobd[INFO](obdchanelm_setup:473): ELM linefeed off
libobd[RAW_DATA]: Sending to ELM -> 'ATST 19|'
libobd[RAW_DATA]: Recieved from ELM -> 'OK||>'
libobd[RAW_DATA]: Sending to ELM -> 'ATAT2|'
libobd[RAW_DATA]: Recieved from ELM -> 'OK||>'
libobd[RAW_DATA]: Sending to ELM -> '0101|'
libobd[RAW_DATA]: Recieved from ELM -> 'CAN ERROR||>'
libobd[ERROR](obdchanelm_error:68): ELM error: "CAN ERROR"
libobd[INFO](obdchan_setup_channel:100): ELM communication failed!
ERROR [10:12:12.437396] obd-thread.c:0170 - Problems setuping the obd channel, using: /dev/rfcomm0
libobd[ERROR](obd_close:166): Trying to close an not opened obd device
libobd[INFO](obdcon_closedev:220): Trying to close serial connection
libobd[INFO](obdcon_closedev:247): Serial connection closed

This is the log file in the system of N900 which showed Can error.


Now I googled and came across this post.

My board was lke Argo board and I followed what he did.

I just destroed the capacitor.

It still works with Android phone but does not work with N900.

Can Anybody suggest anything?

Thanks.

[Argo]

I just destroed the capacitor.

R04 is a resistor

Assuming you only destroyed R04 then I'd go ahead with the full mod suggested by Yani at the start of this thread which involves soldering in a simple RC network.

That's the reason I said "quick & dirty"

[sam29]

I just destroed the capacitor.

R04 is a resistor

Assuming you only destroyed R04 then I'd go ahead with the full mod suggested by Yani at the start of this thread which involves soldering in a simple RC network.

That's the reason I said "quick & dirty"

Thanks Argo for quick reply.
Honestly, I understoor your method and original method just flew at the top of my head.

looked at it, dun know where should I sold it as our board is different from original poster....

what you reckon?

Cheers.