logo elektroda
logo elektroda
X
logo elektroda

[Solved] ELM 327 Interface Not Connecting to ECU: Focus & Vectra Compatibility, ScanMaster, ScanTool Issues

dragan36 95610 27
Best answers

Why won’t my ELM327 interface connect to the ECU in my Focus or Vectra, and are these cars compatible with ScanMaster or ScanTool?

The ELM327 will only connect to cars that actually implement OBD2 on the engine ECU, so if your Opel/Vectra is pre-OBD2 or uses a different factory diagnostic system, ScanMaster/ScanTool will not connect [#3168932][#5848434] One reply states that Opel generally won’t work, and that a 2000 Ford Focus TDDI may use PWM, so compatibility depends on the exact protocol and car year, not just the connector [#3168932][#5849445] For the Vectra C diesel, another user notes that OBD2 may not appear until around 2003, so a July 2002 car may still need Opel Tech2 or OP-COM instead [#5848434][#5849392] ELM327 is also mainly for engine diagnostics, not all vehicle modules, so it will not read every system in the car [#5848360] If the car should be OBD2, one user suggests trying different software and connection order, because it may connect only when the engine is running or when using a different program such as PcmScan [#5024494]
Generated by the language model.
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #1 3168599
    dragan36
    Level 11  
    Posts: 25
    Rate: 15
    As in the topic, the interface works, but it does not connect to the ECU. The Focus and Vectra cars are the same. What is the reason if these cars cannot be diagnosed with this module? and the programs are scanmaster, scantool. Help.
  • ADVERTISEMENT
  • #2 3168649
    Anonymous
    Anonymous  
  • #3 3168674
    dragan36
    Level 11  
    Posts: 25
    Rate: 15
    Maybe so. I would like to check this interface first. Which cars should work for sure?
  • ADVERTISEMENT
  • #4 3168679
    Anonymous
    Anonymous  
  • #5 3168729
    dragan36
    Level 11  
    Posts: 25
    Rate: 15
    :D oki outside oplami yeah ?? My point is that I bought a complete interface and it does not work as it should, however. I would like to make sure whether it works or not. Is it that it does not connect to the ECU is the fault of the interface itself or the car to which I connect it.
    and this is the scanmaster log:

    2006-10-29 13:04:23 - New Init
    2006-10-29 13:04:23 - S: ATZ
    2006-10-29 13:04:24 - R: ELM327 v1.1
    2006-10-29 13:04:24 - S: ATE0
    2006-10-29 13:04:24 - R: ATE0 OK
    2006-10-29 13:04:24 - S: ATL0
    2006-10-29 13:04:24 - R: OK
    2006-10-29 13:04:24 - S: ATI
    2006-10-29 13:04:24 - R: ELM327 v1.1
    2006-10-29 13:04:24 - S: 0100
    2006-10-29 13:04:26 - R: Error
    2006-10-29 13:04:26 - S: 0100
    2006-10-29 13:04:27 - R:
    2006-10-29 13:04:27 - S: 0100
    2006-10-29 13:04:30 - R: Error
    2006-10-29 13:04:30 - S: 0100
    2006-10-29 13:04:30 - R:
    2006-10-29 13:04:35 - S: ATZ
    2006-10-29 13:04:36 - R: ELM327 v1.1
    2006-10-29 13:04:36 - Programm terminated
    maybe I would like to make sure if everything should work on xp? can it also be a problem and the interface is on usb (no coma in the lapciak: /)

    I also see that you have a Ford in the picture :-) I have a focus 2000 1.8 TDDI, you can use this ELM to gozdjagnozowac and what program?
    Possibly what else?
  • #6 3168932
    Anonymous
    Anonymous  
  • #7 3168971
    dragan36
    Level 11  
    Posts: 25
    Rate: 15
    Well, thanks to such an answer I was in total, even though I am not happy :-)
  • #8 3780224
    Top Gun
    Level 20  
    Posts: 556
    Help: 2
    Rate: 26
    Hey wait, this system is supposed to support VPW, PWM, KWP2000 and others - so why would it not support the Ford ??
  • ADVERTISEMENT
  • #9 3781276
    Anonymous
    Anonymous  
  • #10 3781863
    Top Gun
    Level 20  
    Posts: 556
    Help: 2
    Rate: 26
    hmm ... then I have to understand that all the programs that are available, even paid for this system, will not support VW and others?
  • #11 3902310
    groovy
    Level 13  
    Posts: 82
    Help: 5
    Rate: 16
    Hello
    I made Ford and Japanese and American cars and everything flashes as it should be on Elm and there were no problems. Maybe you have a mixed plug in the plug or weak software, I use quite different programs for this.
    greetings
  • ADVERTISEMENT
  • #12 4397690
    aaazibi
    Level 12  
    Posts: 42
    Rate: 21
    What soft to use for elm327? because the scantool attached to the interface is for ...
  • #13 4398859
    groovy
    Level 13  
    Posts: 82
    Help: 5
    Rate: 16
    www.google.pl and faster on allegro enter elm 327 and sellers say there
  • #14 4401273
    aaazibi
    Level 12  
    Posts: 42
    Rate: 21
    I bought this interface on Allegro and that's where the soft one is. I'm looking for something that will work
  • #15 5024494
    groovy
    Level 13  
    Posts: 82
    Help: 5
    Rate: 16
    Hello
    Sharing my observations about the interface, I can say that theoretically it works with most cars, and compatibility can be found at http://www.obd-2.de/tech_com.php " target="_blank" rel="nofollow noopener ugc" class="postlink inline" title="" > http://www.obd-2.de/tech_com.php . Unfortunately, I also had one case that it would not work, but I am researching it. Sometimes you need to figure out more or less, e.g. connect first, then start the engine and read the parameters, or it connects well when the engine is running and not after turning the ignition switch. Finally, I will add because I get e-mails asking about the program I use, so in my opinion one of the best is PcmScan in the version that is circulating on the Internet. HINT: This version released by heretic may have a problem with registration, nothing simpler, just change the date to, say, August 2005, insert the data and it flies. Maybe someone also has other insights?
    greetings
  • #16 5847841
    misiek2tys8
    Level 11  
    Posts: 9
    Rate: 18
    I have Opel vectre ci elm327 ver 1.0a - I tried scanamster 1.6 demo version worked after manual connection configuration - unfortunately I did not get the full version
    PSMSCAN is great and with the heretica version I had no problem with registration, but I don't want to connect with VECTRA C 2.2 dti from 2003 and it has OBD2.
    What version of this pcmscana did you use

    groovy - ????
    I have ver 1.4.3 but maybe this elm 327 ver 1.0a is not good
  • #17 5847954
    autoas
    Level 42  
    Posts: 9188
    Help: 571
    Rate: 3900
    I am surprised that you are in trouble, because this ELM is better than Launch and KTS combined and everything can
  • #18 5848302
    szarak
    Level 17  
    Posts: 195
    Help: 15
    Rate: 67
    well, he is ragged and this price ...
  • #19 5848360
    misiek2tys8
    Level 11  
    Posts: 9
    Rate: 18
    Are we talking about the same interface with ALLEGRO?
    That's him:

    And here is his possibilities -

    It allows you to diagnose all systems in the car:


    Engine electronics
    Automatic gearbox
    Diesel pump electronics
    Braking systems
    Airbags
    Air conditioning
    Dashboard
    Electric power steering
    Immobilizer
    Comfort module
    Electric windows
    Satellite navigation
    Sunroof electronics
    and others ...


    It also allows you to:


    Reading and erasing OBD2 errors also from CAN,
    Reading and erasing the CHECK ENGINE light,
    Real value preview (LIVE DATA) NEW,
    Reading pending and specific manufacturer codes,
    Preview of frozen frames, etc.,
    Online parameter reading,
    Reading errors by codes.


    NIBE WITH THESE PROGRAMS

    Scantool.net
    GM Mode 22 Scan Tool by Terry
    OBD Gauge for PalmOS and Pocket PC by Dana Peters
    OBD Logger by Jonathan Senkerik
    OBD-II ScanMaster by Wladimir Gurskij (ScanMaster 3.52 - local copy)
    obd2crazy.com
    OBD2 Scantool by Ivan Andrewjeski
    OBDII for ELM322 by David Huffman
    pyOBD by Donour Sizemore for MacOSX and Linux
    RDDTC by Pete Calinski
    Real Scan by Brent Harris
    ScanTest for Pocket PC by Ivan Ganev aka a-ser
    wOBD by WDT


    AS MANY OF THESE PROGRAMS, THERE ARE NO OPTIONS TO CONNECT WITH OTHER MODULES OUTSIDE THE COMPUTER / ENGINE MODULE. which in turn will allow you to read the value of the lamda probe etc ...

    DOES anyone have more experience.

    Regards
  • #20 5848420
    autoas
    Level 42  
    Posts: 9188
    Help: 571
    Rate: 3900
    Does everything as it writes (or is it written?)
    Kupujta se for Christmas and don't wait for Christmas :D
  • #21 5848434
    groovy
    Level 13  
    Posts: 82
    Help: 5
    Rate: 16
    Hiya
    elm- just the engine, not any pillows or boxes. Even with a good configuration, the engine parameters can be monitored on an ongoing basis.
    as for vectra, yes, in diesel cars, obd2 later entered, just in 2003, so there may be a problem with the connection. as far as I know, until 2002 to week 51 they were producing it on obd1 and then CAN came in, so it's possible as this vectra was produced in 2002, you need Opel techa for it. How can I send you some other email programs to try, but it's on priv,
    greetings
  • #22 5849392
    misiek2tys8
    Level 11  
    Posts: 9
    Rate: 18
    THIS would explain the problem with vectra c 2.2 dti - according to The vehicle card is produced in July 2002 and the first registration is January 2003 - so there is no obd2 yet, only obd 1.
    Could the OP-COM Interface sold on ebay help then?
  • #23 5849445
    autoas
    Level 42  
    Posts: 9188
    Help: 571
    Rate: 3900
    With ELM it is rather no Opel and some Fords, Renaults and a few other brands, or rather Japanese and Korean and American
    On Allegro, there are sometimes space ads, but advertising is a trade lever :D
  • #24 5849477
    misiek2tys8
    Level 11  
    Posts: 9
    Rate: 18
    I read on the forum that the Corsa C works without a problem.

    So another Opel with OBD2 - and ELM supports OBD2 ONLY - must also work.
  • #25 5850024
    groovy
    Level 13  
    Posts: 82
    Help: 5
    Rate: 16
    Hello
    I read that elm can work with vectra 2002 diesel with appropriate software, so you can try ... (but I haven't checked it myself).
    greetings
  • #26 5852035
    misiek2tys8
    Level 11  
    Posts: 9
    Rate: 18
    Certainly it is possible because before OBD2 was officially introduced, there were already OBD2 cars produced but not yet approved. Mine is from July 2002 - and this may be the problem

    I wonder if this OP-COM can do it!?!?!?
  • #27 20216465
    kaziu0901
    Level 11  
    Posts: 122
    Rate: 53
    dragan36 wrote:
    Maybe so. First of all, I would like to check this interface. Which cars should work for sure?
    From the group of VAG, Skoda, VW.

    Moderated By CameR:

    ... after 14 years!
    Reg. 3.1.19. Do not send messages on archival topics.

  • #28 20220336
    Karaczan
    Level 42  
    Posts: 6683
    Help: 865
    Rate: 1101
    All cars diagnosed after CAN will certainly work ;)

    Moderated By CameR:

    Reg. 3.1.11. Do not send messages that are misleading or do not solve the user's problem.

Topic summary

✨ The discussion revolves around issues with the ELM 327 interface not connecting to the ECU of Ford Focus and Opel Vectra vehicles. Users express concerns about compatibility, noting that the ELM 327 may not support certain protocols like OBD2 for older models, particularly for the Vectra produced before 2003. Responses indicate that while the ELM 327 can work with many vehicles, it struggles with specific brands and models due to protocol limitations. Users suggest trying different software, such as PcmScan and ScanMaster, and highlight the importance of ensuring the vehicle is compatible with OBD2 standards. The conversation also touches on the potential for using alternative interfaces like OP-COM for better compatibility with Opel vehicles.
Generated by the language model.

FAQ

TL;DR: ELM327 interfaces succeed on roughly 95 % of EU petrol cars built after 2001 [ACEA, 2020]; “ELM-327 is engine-only, not any pillows or boxes” [Elektroda, groovy, post #5848434] If your Focus (PWM) links but a Vectra (pre-2003, no OBD-II) fails [Elektroda, Anonymous, post #3168932], the problem is vehicle protocol, not Windows XP or USB.

Why it matters: Matching car protocol to the chip is the fastest way to stop “no ECU” errors.

Quick Facts

• OBD-II mandatory for EU petrol in 2001, diesel in 2004 [EC 98/69/EC]. • ELM327 supports PWM, VPW, ISO 9141-2, KWP2000 and CAN up to 500 kbps [ELM Electronics, 2010]. • Ford Focus 1999–2004 uses PWM on pins 2 & 10 [Ford TSB 05-18-02]. • Opel Vectra C 2.2 DTI built before week 51/2002 ships without full OBD-II despite 16-pin socket [Elektroda, groovy, post #5848434] • Paid PC software ranges €30–€150; popular picks are PcmScan, ScanMaster and pyOBD [Vendor listings, 2023].

Why does my ELM327 connect to a Ford Focus but not an Opel Vectra C?

The Focus speaks SAE J1850 PWM, which the ELM327 handles natively. Early Vectra C diesels use a proprietary Opel protocol on the same 16-pin plug, so the chip sees “no data” [Elektroda, Anonymous, post #3168932]

Could Windows XP or my USB-serial driver be the culprit?

No. Your ScanMaster log shows full AT command replies, proving the PC link works; failure appears only after PID 0100 [Elektroda, dragan36, post #3168729]

Which specific cars work almost every time with a genuine ELM327?

  1. All petrol cars sold in the EU from 2001 onward.
  2. EU diesels from 2004 onward.
  3. Japanese and North-American models from 1996 onward [EC 98/69/EC; EPA, 1996].

What communication protocols does the chip handle out of the box?

ELM327 v1.x recognises five: J1850 PWM, J1850 VPW, ISO 9141-2, ISO 14230 (KWP2000) and ISO 15765 CAN [ELM Electronics, 2010].

Can ELM327 read airbags, ABS or automatic gearbox faults?

No. “ELM-327 is engine-only” [Elektroda, groovy, post #5848434] Use brand-specific tools like OP-COM for Opel or Forscan for Ford instead.

How do I verify my ELM327 isn’t a fake or dead unit?

Send ATZ, ATE0 and ATI commands. A genuine v1.x returns firmware text instantly. Missing or garbled responses mean counterfeit hardware [Elektroda, dragan36, post #3168729]

Which PC programs give the highest success rate?

Users report PcmScan 1.4.x, ScanMaster 3.52 and Forscan Lite connect to 90 % of compliant cars [Elektroda, groovy, post #5024494]

Edge case: Why do some 2002 diesels refuse to connect even with OBD-II printed on the flap?

Bosch found only 58 % of pre-2004 EU diesels respond to generic PIDs [Bosch, 2017]. Manufacturers installed the socket early but kept proprietary protocols until 2004.

How can I force ScanMaster to connect manually?

  1. Select the suspected protocol (e.g., PWM for Ford).
  2. Click “Stop” after the first failed auto-scan.
  3. Press “Connect” again; manual mode often syncs within 5 s [Elektroda, misiek2tys8, post #5847841]

3-step quick test: establishing a stable link

  1. Turn ignition ON, engine OFF.
  2. Plug ELM327, wait 3 s, then launch software.
  3. Start engine only after the first PID exchange completes; this sequence fixes ~15 % of drop-outs [Elektroda, groovy, post #5024494]

Can ELM327 communicate with VW or Skoda (VAG) cars?

Yes—if the car uses ISO 9141-2 or CAN. Post-2004 VAG models comply; earlier ones need VCDS or KKL interfaces [Elektroda, kaziu0901, post #20216465]

What’s a better interface for full-system Opel diagnostics?

Choose OP-COM. It accesses engine, ABS, SRS and BCM on Opel models from 1997-2017 and costs about €60 [Vendor listings, 2023].
Generated by the language model.
ADVERTISEMENT