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[rajveer.sandhu]

My speedo stopped working and ABS and TC lights stayed on.
I decided to use a code reader to read the fault codes.
When I tried reading the ABS and TC ECU codes, it seemed as if the code reader could not communicate with it.
After reading the How2 guide on replacing the ABS ECU, I decided to replace the ABS ECU with one from exactly the same car (3.0v6, Manual - has the same Bosch part numbers).

I have replaced the ABS ECU, and still the speedo, ABS, TC doesnt work and I can not read any fault codes (Same as before).

Has anyone experienced this before?
Is there anything I can do to diagnose the problem?
Or is there any fuse that would stop the code reader from reading the codes properly?

Thank in advance.

[Jimbob]

the fact you cannot communicate is one of the symptoms of a knackered ecu

all plugs clean? try a different code reader?  did yours work before?

[rajveer.sandhu]

I only got the code reader after the original abs ecu started to fail.
So i never actually read the codes before.

Does anyone have a working ecu for sale on here?
What would you need from my original unit to identify it?

[rajveer.sandhu]

Also, I do get a working ABS ECU, would I be able to communicate with it with a code reader by plugging in the smaller connector (on the bottom) and the large connector (on top) - (would I need to actually fit the ABS ECU)?

[aaronjb]

There was a thread recently from someone who had the same problem; fried ABS ECU, replaced, still same fault.. turned out the old ABS ECU had taken the fuse with it when it kicked up it's heels. Worth checking if you haven't already.

[rajveer.sandhu]

Would you be able to tell me which fuse it is?
I have tried searching for ABS ECU fuse, but nothing really comes up...

[Abiton]

This was the thread: http://www.omegaowners.com/forum/index.php?topic=85458.msg1184044#msg1184044

I have a feeling there may not have been anything wrong with his original ECU. 

Owners manual should show fuse info?

[rajveer.sandhu]

Yep! - Replaced the 10A fuse, turned the ignition on - blew the fuse straight away.

There must be a shorted wire somewhere - unsure where though.

Any ideas or common areas to look at?

[Abiton]

Unplug wiring connector from ABS ECU, pop new 10A fuse in, switch on ignition.
If the fuse blows it's a wiring problem, if it doesn't, you've still got an ECU problem, I think.

[rajveer.sandhu]

I replaced the 10A fuse (ABS - 19) and turned the ignition on.
This time it did not blow, but still no communication with the code reader and the TC,ABS lights are still on.

When you say 'wiring connector', I assume you mean the larger one that plugs in on top, not the smaller one that plugs in at the bottom of the ABS ECU?

I'll try it tomorrow morning (been at it since 11am!).

[I_want_an_Omega]

Have you been playing? I ask as the speed signal you enquired about in another post is generated by the ABS ECU - the blue/red wire. Just a thought.

[rajveer.sandhu]

Nope - ABS ECU hasn't been working properly for around 2 months or so, and not at all for around 3/4 weeks.
(Posted questions regarding a non working ABS ECU months ago - when the fault first occurred intermittently)

[rajveer.sandhu]

Problems been sorted now.
I think one of the contacts on the ECU plug was not connecting properly, I took the connector plug off and wiped each connector with a cotton bud, the 4 large flat connectors on the ECU and ECU Connector supply the power (and return) so I paid more attention to those.

Thanks for all your suggestions.