kp 115
A2OC Donor
Only a 3-5 day turnaround of your unit once received
Quest to healthy A2
- Thread starter Un4tural
- Start date
Checked what i could get to for the wheel hub for dirt etc. and it is fairly clean, gave it a bit of a spray out etc. but no change, still getting the same errors even scanning without starting engine/moving, as a last resort i'll just go and replace the wire on the loom, can anyone advise on the part number for the connector or the process? as it is all rubber tubed.
I am guessing i can un-pair the joint where plug for sensor is and terminate the wires there, are hopefully there aren't any other plugs until the loom bit where the wires go in through the wheel arch liner? (plan to undo the rubber bit then attach new wire and pull it through along with old one without having to undo the rubber tubing shield).
Can the connector be gracefully taken apart to replace the wire connected? From symptoms it feels like it is the damn loom but when testing with multimeter there is continuity and seems ok...
@kp 115 i appreciate it is a good turnaround, but i can't leave the car half apart on the street, also taking the ABS pump off and presumably re-filling liquids etc. just dont have the space or appropriate tools/facilities for this option. Need to get to work and around too.
I am guessing i can un-pair the joint where plug for sensor is and terminate the wires there, are hopefully there aren't any other plugs until the loom bit where the wires go in through the wheel arch liner? (plan to undo the rubber bit then attach new wire and pull it through along with old one without having to undo the rubber tubing shield).
Can the connector be gracefully taken apart to replace the wire connected? From symptoms it feels like it is the damn loom but when testing with multimeter there is continuity and seems ok...
@kp 115 i appreciate it is a good turnaround, but i can't leave the car half apart on the street, also taking the ABS pump off and presumably re-filling liquids etc. just dont have the space or appropriate tools/facilities for this option. Need to get to work and around too.
Oddly old sensor shows a lot more resistance when i measure it with multimeter, however when i plugged the new sensor in and tested it at ABS connector at the abs unit reading was identical to one measuring directly at the sensor...
This might be of help. Before you ask it is not yet fully fitted (!!!!) so I cannot comment fully on fitment, but looking at the length I think the loose flex end terminates in the passenger side underfloor compartment. Looks a pig to do fully, getting the new cable through the big cable grommet at the top left of the engine compartment is the problem. Will be simpler to butt joint to the existing wire in the engine compartment but test before you chop the new cable.
Andy
Thanks Andy, very helpful, it also appears the part that goes to brake pad wear sensor has been butchered on mine as it does not have the normal plug terminal at all... it is just shorted together.
Is there no option than buying whole new harness part? might just put some few wires to the sensor from ABS connector round the outside just to test, does not look like it would be possible to replace the wires inside the rubber tube
Anyone could provide main ABS connector pin-out? I could probe what other sensors show hopefully would give me some more insight on the problem.
Butchery of pad wear wires is very common, just like mine was.
Is there no option than buying whole new harness part? might just put some few wires to the sensor from ABS connector round the outside just to test, does not look like it would be possible to replace the wires inside the rubber tube
Both my FSI's do not have the tube, just loom wrap which is easy to unravel. I have heard of the tube, Paul(@depronman) mentioned it once and I remember he gently heated the tube to help access to the brake pad wear wires, but maybe only present in TDI's or earlier models. Maybe Paul would elaborate.
I have traced and freed the abs/pad warning loom to the point where it passes through the bulkhead at the top right (viewed from front) of the engine compartment by means of a large grommet. How the hell you get at when emerges from the grommet in the cabin is beyond me at the moment, it looks a lot of work to strip to get at it. Anybody? I think most people give up at this point and butt joint new to old in the engine compartment at this point and weatherproof.
Back to the main point. I agree you have to be convinced of a discontinuity in the abs wire pair pad/abs loom before considering replacement and to this end have to test existing for continuity or make up a temporary abs loom to test if it solves the fault. Either way you need to know precisely where the abs cable from the wheel sensor ends up. Sorry I cannot help with this I have not got that far yet. Maybe you know, I don't, but I suspect it ends up at the multi junction connector boxes at the base of the passenger A pillar or one of the units in the underfloor passenger compartment. Is the ABS controller the unit at front of the compartment? Anybody?, this is way beyond my pay grade.
At a very simple level I can see the ABS wire pair at the wheel end are pure (no stripe) black and brown which matches a wiring diagram I looked at showing the abs pair going directly to the abs controller. I will look later in the week if I can identify them in the passenger footwell.
For a nominal sum of £1.00 plus postage, If it is any help, I can send you my old abs/pad loom with its ABS connector, cut off in the engine compartment so you have a test loom. I will check integrity of the ABS wire pair before posting but the pad wear pair are twisted together and have a discontinuity.
Hope I have said something useful and anyway it bumps your thread.
Andy
Thanks for the help everyone, I've tested the wiring and it is definitely a ok, continuity is fine and no excessive resistance. gave contacts a clean too but still seeing the same error codes, leaving the sense ring or the abs unit itself, will give a clean through the abs hole using a pipe cleaner today and if that does not clear i'll list it for parts/repairs, as it would be not quite worth repairing it at this point for myself, maybe someone with tools and facilities can give it a home or donate bits to a good cause.
After some looking into the ABS ring seems to be part of bearing and not a separate part. When trying to get it with a rag did manager to discover a fair bit of crud, thought still having same error, so ordered some pipe cleaners and will give it a repeat later.
Edit: Sad to say will have to let this one go, this one is beyond what i can do to repair it both facilities tools and space wise.
After some looking into the ABS ring seems to be part of bearing and not a separate part. When trying to get it with a rag did manager to discover a fair bit of crud, thought still having same error, so ordered some pipe cleaners and will give it a repeat later.
Edit: Sad to say will have to let this one go, this one is beyond what i can do to repair it both facilities tools and space wise.
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