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Author Subject: Immobiliser bypass
dangti6

aka JKshooter

Location: Taunton, Somerset

Registered: 15 Jun 2006

Posts: 10,305

Status: Offline
Post #1
Say you found yourself with a GTi6 but have no keys - how would you personally go about getting it running?

Basically I've bought a GTi6 with no keys. I supplied the engine to the previous owner a while ago - but I want to be sure it runs well before moving it on for piece of mind.

I've another ignition barrel and loom which I've been using to get power, test the electrics etc but now I'm keen to start it up.

One suggestion has been to cut immobiliser wires.

What I do have is a spare soft unlocked ECU and 205 GTi6 wiring loom. My idea is to unplug the existing 306 loom from the engine and perhaps unplug the transponder box so I don't risk my soft unlocked ECU locking and plug my 205 loom with brown plugs. I obviously don't care for having the gauges working, and I recall reading that only a couple of wires on a 205 need connecting to physically start the '6 engine so my intention would be to have the 205 loom connected up with the brown plugs in the bay and apply feed to the appropriate wires.

Does this sound achievable? I'm not electrically minded so if putting a wire or two directly from the battery to the (presumably starter and ignition) pins on the brown plugs is a bad idea - please shout!

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    • Posted 4th Nov 2014 at 17:29
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    cully

    Seasoned Pro

    Location: Cullompton

    Registered: 12 Jun 2013

    Posts: 1,093

    Status: Offline
    Post #2
    hire a proper unlocked ecu off a member that is willing to ship ?

    buy a ecu/chip/security module from a going car/ebay
    Posted 4th Nov 2014 at 18:11
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #3
    If someone can trust my innocent little face and send me one to do that, then that is another good option.

    BUY!! I'm don't make a habit of buying LOL

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 18:13
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    pug_306

    Seasoned Pro

    Location: Great Hockham

    Registered: 28 May 2013

    Posts: 1,592

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    Post #4
    Can't you unplug the transponder fit your unlocked ecu and fit the barrel?

    ________________________________________

    1998 Supercharged White Rallye
    1992 205 GTi6
    205 Turbo 340bhp
    Posted 4th Nov 2014 at 18:47
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #5
    If someone can confirm that's possible, then that would be very handy.

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 19:07
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    pug_306

    Seasoned Pro

    Location: Great Hockham

    Registered: 28 May 2013

    Posts: 1,592

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    Post #6
    Yes just unplug your transponder and plug your soft unlocked ECU on, ive done it many times :-)

    ________________________________________

    1998 Supercharged White Rallye
    1992 205 GTi6
    205 Turbo 340bhp
    Posted 4th Nov 2014 at 19:32
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    welshpug!

    Capt Pedantic

    Location: Bigend, Wales.

    Registered: 27 Mar 2007

    Posts: 25,839

    Status: Offline
    Post #7
    yup as mentioned, just discommect the black box

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    Bring on the Trumpets.

    Posted 4th Nov 2014 at 19:39
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #8
    Superb. Thanks very much chaps Thumbs up

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 20:06
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #9
    Whilst I think of it...

    You can remove an ECU with just the ignition on and it will be soft unlocked for 205 use etc - so before I do anything, can I turn the ignition on with my new barrel and key and remove the ECU for 205 use, or because it's not got the correct key chip, it won't be possible?

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 20:33
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    pug_306

    Seasoned Pro

    Location: Great Hockham

    Registered: 28 May 2013

    Posts: 1,592

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    Post #10
    No it needs the correct chip in the key to unlock it buddy. You will need to unplug your transponder then fit soft unlocked ecu :-)

    ________________________________________

    1998 Supercharged White Rallye
    1992 205 GTi6
    205 Turbo 340bhp
    Posted 4th Nov 2014 at 20:37
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    cully

    Seasoned Pro

    Location: Cullompton

    Registered: 12 Jun 2013

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    Post #11
    dont get clever you will confuse yourself and end up with two locked ecu's Wink
    Posted 4th Nov 2014 at 20:39
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

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    Post #12
    Thanks Ryan. Just wanted to ensure I wasn't missing a trick and not maximising profits.

    Paul, I'll be sure to get the paint pen out and write on them LOL

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 20:42
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    Puggitt

    Regular

    Location: New Zealand

    Registered: 07 May 2012

    Posts: 293

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    Post #13
    Side question, what are the differences/ limitations of a soft unlocked ecu vs a regular unlocked one?
    Posted 4th Nov 2014 at 21:09
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #14
    From what I believe, a soft unlocked ECU is ideal for fitting to something like a 205 with a gti6 engine as it has no immobiliser, or even a 306 if you disconnect one of the transponder plugs - although you'll then have no immobiliser.

    A properly unlocked ECU will go into any 306 with ECU problems and not re-lock so you can retain your immobiliser.

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 21:23
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    Puggitt

    Regular

    Location: New Zealand

    Registered: 07 May 2012

    Posts: 293

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    Post #15
    And it's that easy to soft unlock an ecu? Ignition on disconnect ecu, done? I've got an external immobiliser so not to worried about the factory one.
    Posted 4th Nov 2014 at 21:28
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    bigbadbowen

    Seasoned Pro

    Location: Winchester

    Registered: 21 Nov 2003

    Posts: 13,753

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    Post #16
    Yup
    Posted 4th Nov 2014 at 21:34
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

    Registered: 15 Jun 2006

    Posts: 10,305

    Status: Offline
    Post #17
    Yeah you don't need to start it, just ignition on and pulling the plug off the ECU does it.

    What is your reasoning for wanting to soft unlock it?

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  • Senior Test Automation Engineer for the 306GTi6 Owners Club Forum Wizard

    • Posted 4th Nov 2014 at 21:34
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    Puggitt

    Regular

    Location: New Zealand

    Registered: 07 May 2012

    Posts: 293

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    Post #18
    As my friends would say #becauseracecar LOL making a track car for Tarmac rallies and want to get rid of the key barrel and use switches in the centre console so my co driver can turn the car off easier in event of... My Incapacitation. This way I can run the ecu I've got now rather than buying an unlocked one or aftermarket ecu and getting it remapped.

    So once I have it soft unlocked, I can just remove everything connected to the black box and the collar then put my switches in?
    Posted 4th Nov 2014 at 22:21
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