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post #66 of 82 (permalink) Old 24th December 2011
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Re: Laguna II - ABS not working but no warning lights ?

Success!! Changed the ABS ECU the day before yesterday, and now I have no ABS light on. Thanks to dannyc & TTT for this idea.
I did remove the wheel, wheel arch liner, inner splash guard, horn, small metal bash plate, and 2 of the ABS bracket mounting bolts, which allowed me access to remove the ECU from the outside so it was easier to manoeuvre into position, (rather than inwards past the radiator hoses.)
Also put new pads and discs on the day before, so all good in this department.
Currently in trickyd400's garage:
2001 Renault Laguna II 1.9dCi Dynamique Estate, Ford Fiesta Mk6 1.25 Style, CBR400RR, Beta Zero Gara- now stolen!!! GRRRR!!
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post #67 of 82 (permalink) Old 24th December 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Quote:
Originally Posted by dannyc View Post
@ TTT

i would like to just so we all know where the problem lie's
but with it being cold and wet outside im waiting for a good day and when ive got some spare time to be outside.
watch this space..........
I'm watching...



@ trickyd400

Great result, wish I had thought of just changing the ECU when I done mine, it would have saved getting covered in brake fluid.

So that's 2 dodgy ECU's, danny's and yours, I wonder if it's just bad connections inside the ECU that causes the problem or some component that has failed.

Have you tested the ABS to see that it kicks in ok under braking ?


Cheers.
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post #68 of 82 (permalink) Old 24th December 2011
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Re: Laguna II - ABS not working but no warning lights ?

@TTT
im sorry to say im glad you changed the unit with block and opened your ecu otherwise i would of never gone down my route and followed yours, its been a few weeks now and ive had perfect performance from the abs

id like to know what renault customer services think, maybe a recall should be in place, fine my car is 10 years old but has only 34k from new which is nothing
this seems to be a very common problem ive spoken to a citron/pug & renault specialist and a ex main dealer service manager who all say abs problems are common as.

@trickd400 did you take the bumper off or just the side??, and glad we could help
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post #69 of 82 (permalink) Old 26th December 2011
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Re: Laguna II - ABS not working but no warning lights ?

Yes I took the bumper off completely, I have the undertray off at the moment too. I repainted the grazed trim in the n/s of the bumper as it is easier to remove it without damage when the bumper is off.
Before

After

I touched in the scratches on the rearbumper which is the same colour at the same time. Also I replaced a missing trim from the headlight washer jet (thanks ebay)

OK down to business, bumper removed, as per insrtuctions for headlight washer replacement in another thread.


So wheel is off, and inner wheel arch removed (sunroof drainage blockage issue now resolved too) I removed the horns one 13mm bolt and one plug.

then the small metal bash plate, 2 more bolts

also removed the inner splash guard, 2 plasic 1/4 turn trim clips along its lower edge and it clips onto 2 uprights


You will notice the gravel drive, which is a pain in the a***e, so I always keep large cardboard boxes (flattened) to work on, saves my aging knees!
Next I undid 2 of the ABS pump bracket bolts with a 10mm spanner and a 13mm socket:
You can just see the head of the bolt to the left of the ABS pump connector (blue & yellow)

and this bolt:

The bracket is now held on by one more fixing, but enough movement is possible to extricate the ECU. Next undo the 2 T25 torx srews that hold the ECU to the pump body: one through this hole:

the other with a 1/4" drive and bit adapter: or 3/8" T25 bit just fits...


Un plug the ABS blue plug and ease off the ECU and reassemble.

I had previously plugged my new ECU in and turned the ignition on just to be sure that the ABS lights went out as required , which they did.
I was also happier doing this as the valve block arrived with all the brake pipe ports open with obvious signs of dirt ingress...
Finally replacement nearly new discs and new pads:
Currently in trickyd400's garage:
2001 Renault Laguna II 1.9dCi Dynamique Estate, Ford Fiesta Mk6 1.25 Style, CBR400RR, Beta Zero Gara- now stolen!!! GRRRR!!
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post #70 of 82 (permalink) Old 27th December 2011 Thread Starter
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Re: Laguna II - ABS not working but no warning lights ?

Thanks for the pictures, it helps other members picture the job.

Have you checked that the ABS is working when braking?
I know I keep going on about testing that the ABS is actually working, the reason for this is because with my fault even though the ABS warning lights were out on the dashboard the ABS still wasn't working when braking!


Cheers.
Currently in TTT's garage:
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