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1996 3L 24V ECU not connecting

PostPosted: Wed Mar 08, 2017 12:50 pm
by justhb
Dear All,
I have an issue with my car. None of the recognised ECU reading software packages are connecting to the ECU - Multiecuscan, Alfa Diag or Alfa 164 Forum.

The ecu is communicating via the 'flashing' lights on dash system.

Has anybody else experienced this problem?

The ECU reference is 0 046 422 643 0

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 08, 2017 9:28 pm
by Alfan
I think that people who have tried the program found on this site have got it to work, though maybe not first time.

If you have no connection with any of the tools, my guess is that your setup is wrong, since the manual way works.

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 08, 2017 10:58 pm
by justhb
Up till now, three different people (including myself) have tried to connect with different cables and systems. I am wondering if the ECU has been tampered with at some point or if the wiring has been damaged.

Re: 1996 3L 24V ECU not connecting

PostPosted: Thu Mar 09, 2017 2:40 pm
by Alfan
Then the only thing I can think of, is to measure if the wires from the ECU to the 3-pin diagnostic plug are ok. Since the manual method works, I still think the ECU is ok, but I don't know how the manual test system is working.

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 15, 2017 2:35 pm
by justhb
I have found out that the ecu was reprogrammed to an earlier version car as the immobiliser was removed owing to problems.
Would this cause an issue with the twin wire plug and there not being any signals being sent to it?

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 15, 2017 8:48 pm
by Alfan
I suggest you try the different versions of ECU's. I have no idea if the reprogramming would have impacted the pin layout.

However, I still suggest to measure the impedance of the 3 wires going to the diagnostic plug to verify it they are ok or not.

Re: 1996 3L 24V ECU not connecting

PostPosted: Fri Mar 17, 2017 11:22 pm
by justhb
I am getting the ECU sent away for testing.
I hope that it isn't at fault! A repair is £285 + VAT!!

Does anyone have a spare I can buy?

Re: 1996 3L 24V ECU not connecting

PostPosted: Tue Mar 21, 2017 7:23 pm
by justhb
Ive had the ECU tested and there are no problems with it.
So does anyone have any ideas why my twin wire plug connector isn't connecting to the ECU/Computer?

Re: 1996 3L 24V ECU not connecting

PostPosted: Tue Mar 21, 2017 8:17 pm
by Alfan
I don't recall that you mention anything about issues with your car. Is it only connecting to the ECU that is not working?

Since the 'flashing' (manual) system is working, I still suggest that you measure the wires for the diagnostic plug. I don't really have other ideas to try out...

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 22, 2017 8:58 am
by justhb
I have a couple of issues-
1. The ECU not communicating via the plug
2. A recurrent fault - 1244. We have changed the EGR solenoid twice but the fault just returns after some poor running

I saw on another forum that a car had a similar problem and that the timing was out by one notch. same fault code 1244. The symptom were as 2 above. Also, the car doesn't seem to have the full power you would expect.

Has anyone else heard of the timing issue being a problem?

Re: 1996 3L 24V ECU not connecting

PostPosted: Wed Mar 22, 2017 3:20 pm
by Alfan
The poor running could well be the timing that is off, no matter what it is definitely worth to get verified!

Mine does not have EGT, but I think that I have read about a connection between the error code and timing issues on alfabb.com

Also, I have tried driving my Q4 with the timing 2 notches off, that was not nice! So get the timing checked asap.