Question about 2003 Ducati ST4S

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New ecu Okay

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I've had zero responses in the general forum so thought I'd try here...here's the story: I purchased a new ECU due to mine being kaput. The bike fires right up and runs great but... All attempts at reprogramming/mating the ECU to the rest of the bike have for lack of a better word failed. The issue? When I start the bike, the immobilizer light comes on during initial turn to on then goes out as normal. About 1 or 2 seconds later it comes back on and stays on. The bike runs great but this light is driving me nuts. When I shut it back off the immobilizer light flashes for 48 hours as normal. I've tried complete red-black-black-red key reprogramming but the dang light won't stay out when the bike is running. Any thoughts?,,,,

Posted on Nov 10, 2008

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Don't forget to disconnect the negative battery terminal. The ecu in those has constant power to the ecu, even with the key off. So never pull off the ecu connectors with the battery connected.
For a wiring diagram, buy a Haynes repair manual. Or register for free at autozone.com, giving make, model, year, and engine size if applicable. The repair guides do have some wiring diagrams, just not complete maybe. Or if interested, you can buy a subscription for $16.99 a month (or under $30 for a full year) from eautorepair.com. It is a DIY site by Mitchell, and with a very extensive amount of help and information. I had a one month subscription there, after getting very, very depressed with my Chilton manual. Couldn't even find a credible wiring diagram for my '87 from Chilton.

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My CEL is on, my code reader reads no codes, sees no live data for any sensor. the jeep seems to run okay, is ecu bad?


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1 Answer

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think about a wet ecu

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
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you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
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sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
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1 Answer

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