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post #46 of 82 (permalink) Old 29th November 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Push fit pins....What will they think of next

So when I thought I could see a little solder on the pins where they contact the edge of the hole in the PCB I was obviously wrong, it must just be the interference fit of the pin.

You can't see it in the photo but there is like a ridge on the 2 sides of the pin where the pin contacts the hole. As the pin is inserted it must push some of the solder that lines the hole up with it , this is what I was thinking was the small amount of solder.

I don't suppose soldering each pin to the PCB would hurt, but I'm not now confident that the problem is down to the pins making a poor connection.


Cheers.


@trickyd400
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post #47 of 82 (permalink) Old 30th November 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

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Originally Posted by TTT View Post
....There's nothing really that can go wrong with the valve block....
Just a bit of thinking out loud here....

I believe the pump fitted to the Laguna is the ATE MK60.

This pump was also fitted to a lot of other vehicles, VW used it on their vehicles. VW had a lot of bad press because of failing ABS pumps, take a look on the web.
The problem was apparently down to the internal Brake Pressure Sensor that is housed in the valve block of the pump.

Some VW's Fitted with the ATE MK60 pump had an external Brake Pressure Sensor that was fitted to the master cylinder, so either the pump was available without the built in sensor or they just used an external one anyway. The cars with the external sensor didn't seem to have the ABS problems.

Onto the Laguna....looking at my master cylinder there is no pressure sensor on it, so I can only assume that it is internal in the valve block of the ABS pump.

Looking at pictures of mk2 Laguna master cylinders (on ebay) I can see some that have the pressure sensor and some that don't.

Given the VW info I assume that if the master cylinder has a pressure sensor that the ABS pump either doesn't have the internal Brake Pressure Sensor or if it does the external sensor is used just like on the VW's.

What's the point of this post....

well I've been assuming that the fault on my original ABS pump was more than likely down to the ABS ECU being dodgy, I assumed this as I know the motor of the pump works ok (tested)
I figured there was nothing that could really go wrong with the valve block, so that only left the ECU. But as you can see above this doesn't seem to be the case, maybe the fault is nothing to do with the ECU and it could be the internal Brake Pressure Sensor in the valve block that caused the problem, that is of course if there is a pressure sensor in the ATE MK60 pump fitted to the Laguna.

I hope you follow all of this & I apologise if I've confused you

All I know for sure is that fitting a 2nd hand pump cured the problem and my ABS works fine now.


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post #48 of 82 (permalink) Old 10th December 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

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Originally Posted by trickyd400 View Post
Thanks TTT, yes I did get your PM, thanks. As I need to get some work done I shall have wait to the w/e before I can investigate further as the car is drivable at the moment.
How you getting on with the problem?


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post #49 of 82 (permalink) Old 11th December 2011
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Re: Laguna II - ABS not working but no warning lights ?

Wow i read the all the thread with great intrest, im off out in the cold tomorrow to swap my abs pump tho after a good read im thinking about just swapping the ecu, i bought my current laggy 10 weeks ago the abs, stop and brake lights are on and have been for some time before purchase, altho i poped out 2 says ago late night (f-ing freezing) and there was no lights then during the day they was back on and cold night last night back off again
i got another pump for 10 from local breakers (self removed)
i think im going for the ecu swap if theres a way of removing without loosing fluid if not its the full lot
with abs would it be best to bleed with ignition on or off?????
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post #50 of 82 (permalink) Old 11th December 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Hi,
10 for a 2nd hand pump is a great price, you've done well with that.

Have you actually tried to see if your ABS is working or not when the lights are on or off?

You will not loose any fluid by removing the ECU, the fluid is in the valve block so you will only loose fluid by loosening the bake pipes to the valve block.

I'm not sure if it's actually possible to remove the ECU from the pump with it in situ, the ecu has to move away from the pump so that the prong clears the valve block, I'm not sure if there is enough space behind the ECU do this, maybe there is, I just can't remember.

There is a hole in the bracket to get to the lower Torx bolt on the motor see the picture below



For bleeding the brakes you don't need the ignition on.

Let us know how you come on.


Cheers.
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