Alarm and ecu relationship

[Meatball]

Should the alarm still lock and arm without the ECU connected?

[Ant.]

yes, not connected to one another as such.
Immobiliser should stop fuel pump running and thats as far as the relationship goes.

[spend]

2 points spring to mind..., some of the immobilisers cut the ECU, some of the fuse arrangements take a power to the alarm/locking from the same point as the ecu (minimal constant 12v IIRC?)

I think its a tricky area to be at all definitive about never mind the alarm pholice

[captaintact]

Surely an immobiliser that cuts the ECU means that the ECU would be re-set to base setting every time and would not retain the information that it "learns" as time goes on?

[Meatball]

Thanks Ant,

Ive just got my ecu back from megasquirt and i now cant get any further than cycling the ignition on and off?
Ive got no alarm, fuel pump prime etc...im told the ecus not the issue any suggestions where to start fault finding.

[Ant.]

Meatball said:

Thanks Ant,

Ive just got my ecu back from megasquirt and i now cant get any further than cycling the ignition on and off?
Ive got no alarm, fuel pump prime etc...im told the ecus not the issue any suggestions where to start fault finding.

In that case, fuse box needs to be the first port of call, as Dave mentioned there could be a common supply. Probably the permanent live.

[Meatball]

Sorted , disconnected the battery for a bit - re connected and its all good
i think the alarm got itself a little confused
thanks for the replys