Caterham 125 Roadsport - Immobiliser issue (Sterling Excel)

[RascalDownSouth]

Morning all!

First post! Sorry it had to be a gremlin!

I have been building a Roadsport 125 with my Dad and when we came to first fire up the engine (1.6 Sigma). We got. Nothing. Looks like the immobiliser is not disengaging.

Caterham have been unusually unhelpful in this instance (main fella we speak to is on hols) but they have suggested that the Sterling Excel immobiliser they use very rarely fails.

So, two questions to start out (as hoping someone may have some experience here)...

1. Where under the dash is the immobiliser located, please private message the location if known.

2. Could a bad earth cause this? Can we test by earthing directly to the battery neg terminal?

The immobiliser should disable when the tag is in proximity to the ignition barrel by showing a steady red light meaning you can start the engine. It currently just flashes merrily away meaning it is still immobilised.

Any help would be much appreciated. We are so close and will be gutted if Caterham have to complete as part of their post build check.

Thanks

Andy

[DCL]

First thing to check is whether you hear the fuel pump running and get a spark symbol in the speedo. If not, then check for a small loop of wire around the ignition switch is in place near the key fob and try waving the key fob over it (try both fobs supplied). Does the LED on the dash flash when the ignition is turned off? If it does it suggests the immobiliser is working. If all that fails, try disconnecting the battery and reconnecting to reset the immobiliser.

Good luck!

[downsman]

I've sent you an email, I hope it is of some interest.
This sort of thing makes the build very frustrating.

By the way, the immobilisers are known to fail quite regularly according to the expert who replaced mine.

[MBBlat]

Check the earth on the loom near the ECU - its short and looks like it would go under the ECU fastenings, which is wrong, it should be bolted into a separately tapped hole using a bolt that Caterham don't supply (or didn't in my kit).

With the immobiliser fob I find I need to lift it up and wave it over the ignition barrel. There should be an obvious click when it disengages & the LED stops flashing.