164S ECU fuse - Alfa Romeo Forum
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Help 164S ECU fuse

This is a 15 amp fuse that has blown out twice recently. Any ideas about what might be causing this?
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Re: 164S ECU fuse

Any ideas, chaps?
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Re: 164S ECU fuse

Originally Posted by Ronald View Post
Any ideas, chaps?
I expect the fuel injectors are switched-ground, and therefore live all the time. Perhaps cast an eye over the injector wiring and look for possible chafing/shorts to metal items (such as the fuel rail) nearby?

If there is a heater matrix leak, I seem to recall that several ECUs are in the firing line within the centre tunnel. Might be worth taking off one of the carpet side panels, unplugging the large multi-plugs and checking for signs of water.

Speaking of which, the round twist-together plug behind the 'false firewall' carries some signals from the engine bay wiring (I'm not sure if these are ECU related; many of the wires are for the air conditioning system) but it would be a good place to check for water ingress.

Other than that, you have to start thinking about what other items are connected to the ECU, e.g. airflow meter, ignition coil driver. My guess is that one of those has chafed wiring.

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