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Jun 14th, 2026
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Joined: Jul 2007
Posts: 27,804 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,804 Likes: 749 |
Dave,
that is what my Roadster does also.
John
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Here's an update, and this, apparently is how the Plus 4 GDI should behave.......(I've consulted my Guru).
Key into ignition.......two seconds and two flashes and it disarms.
Leave key in ignition without turning..............
Wait 30 seconds approx, and the light goes 'flashflash flaaaaash'
So dot dot dash......and this repeats every thirty seconds while the key is in the barrel but the engine not turned on.
Mine is now doing this, so hopefully it's sorted!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Well, yes and no.........
It's sorted with a fully charged battery. I've tested most days since this upgrade and it's been fine. But over a week without charging the battery, and on a day when it was one degree C in the garage, it was slow to disarm. Leaving the key in place, I got one dot-dot-dash, then it rearmed.
A quick charge of the battery restored normal service.
So the voltage sensitivity is real, and just something to be aware of.
On my 2005 Roadster, the immobiliser light flashes until the ignition is switched on. This means that the sensor coil is not permanently live, and on this car there is no significant battery drain.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Probably my final word on this. Over Christmas I've allowed the battery to slowly lose charge. I've tested response each day.
Today at 3 degrees C the immobiliser was sluggish. I put the multimeter on the battery and it's showing 12.18volts. Its now back on charge. From this I'm deducing that 12volts is the point at which things might get awkward.
But I carry a 12v booster pack when we're touring so I'm reasonably confident, now I understand what's going on.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2007
Posts: 28,891 Likes: 350
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,891 Likes: 350 |
If your battery is at 12V it's pretty flat already! 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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Joined: Feb 2016
Posts: 8,657 Likes: 407
Needs to Get Out More!
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Needs to Get Out More!
Joined: Feb 2016
Posts: 8,657 Likes: 407 |
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Today after the charge it showed 13.10 Volts.......
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2014
Posts: 663 Likes: 14
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jul 2014
Posts: 663 Likes: 14 |
My spies tell me the "reluctor" which picks up the signal from the key chip is just held on with a cable tie (try checking that) and it can work loose until it fails to detect the chip. Pip pip.
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Joined: Dec 2008
Posts: 22,356 Likes: 353
Roadster Guru Member of the Inner Circle
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OP
Roadster Guru Member of the Inner Circle
Joined: Dec 2008
Posts: 22,356 Likes: 353 |
Not even a cable tie griffo...see first post. Maybe there is now...
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: Jul 2014
Posts: 663 Likes: 14
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jul 2014
Posts: 663 Likes: 14 |
Thanks Dave,
I have to admit I had not read the first post. I've asked the computer gurus programming the the Ecoboost Plus 4 Plus to delete the immobiliser, which is apparently very easy. So no more chips falling out of keys and non starting issues. I will fit a "secret switch" on the power feed to the low pressure fuel pump instead.
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