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post #36 of 82 (permalink) Old 28th November 2011
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Re: Laguna II - ABS not working but no warning lights ?

A very interesting post TTT. Many thanks for taking the time and effort. Perhaps bad contact between connector and ABS unit? Could disconnecting and reconnecting connector have done the trick?
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post #37 of 82 (permalink) Old 28th November 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Hi,
When the old pump was playing up I did try removing the multi plug a few times but it made no difference so I'm confident it wasn't down to the connection.

The new 2nd hand pump I fitted to the car is working fine so the fault is somewhere on this unit.
It has to be the ECU and my money's on these poor pin to PCB connections.

As I said I would expect to see a full pool of solder around the bottom of each pin.

Have you ever seen connection like this before?


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post #38 of 82 (permalink) Old 28th November 2011
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Re: Laguna II - ABS not working but no warning lights ?

Quote:
Originally Posted by TTT View Post
Have you ever seen connection like this before?
Those are very common in double sided circuit boards. The solder usually fills the through hole reaching both sides.
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post #39 of 82 (permalink) Old 28th November 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Hi,
I've been researching the pins and I believe they are the Press-Fit terminal, Solderless Technology type, that explains why I can't see any solder on them.

http://www.interplex.com/compliant/pressfit


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post #40 of 82 (permalink) Old 28th November 2011
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Re: Laguna II - ABS not working but no warning lights ?

Excellent work TTT. This analysis is very thorough, I have had experience of 'interference fit' contacts degrading over time. It is inevitable that the oxidation of the tinned pins will creep and reduce the contact area and thus increase its resistance, (mainly to the control and sensors circuits) This would be more of a problem for connectors for the higher current required by the solenoids and motor. I think it is worth me taking my ECU off and soldering this pins in, and hopefully improving the continuity.
(I had DF185 error which is ' Internal supply Active servo solenoid valve circuit')
Thinking that its got to come off one way or another!
Only worry in the back of my mind is that this connection method does not heat up the board, so I'll only do one at a time and allow the surrounding area to cool each time to avoid overheating anything, although the switching device will generate heat when active in service, better safe than sorry.
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