ABS Fault

[FarmerPug]

I got the ABS light there the other day before the MOT test and up to the test i was able to get rid of it by disconnecting the battery waiting a few mins and connecting it back up, but now the light is staying on, and pp2000 will not clear the fault:


I took off the RH front sensor (on the drivers wheel), cleaned it up and the reluctor ring on the driveshaft, both of which were quite dirty, popped the cleaned ABS sensor back into place and still the fault remains.

When PP2000 refers to RH does it mean from the perspective of someone sitting in the drivers seat (making RH the drivers side) or someone standing in front of the car facing the bonnet (making it the passengers side)?

Also is there a resistance that i should be looking out for off these sensors?

An important safety point to note about an abs fault is that the abs does not work, the brakes really do lock up and the car will skid leaving the steering useless when it does skid.

[steve_earwig]

A Google says 1-1.5k ohms. You could compare it to the other side (if you're ok with disturbing the wiring/connectors)

[davew]

sometimes even if they read between 1-1.5k ohms they can still be faulty , does PP2000 give any option to test them via live data when driving the car ?, my focus abs sensors all checked out fine with a multi meter but 2 off them were faulty.

[FarmerPug]

Perhaps they produce a fluctuating voltage when the wheel rotates?

But does anyone know where PP2000 refers to, when it says RH, is it the passenger or drivers side wheel?

[jasper5]

Perhaps they produce a fluctuating voltage when the wheel rotates?

But does anyone know where PP2000 refers to, when it says RH, is it the passenger or drivers side wheel?

RH is driver's side.

http://www.topbuzz.co.uk/maintenance/te ... ng_abs.htm This may or may not be useful.

[steve_earwig]

That's the thing, they're coils so they'll be changing the current as the teeth go past.

I'd think it does indeed mean as you're sitting in the driver's seat but after Highlander's coil numbering kerfuffle I reckon all bets are off. Hold on, just firing up sedre...



Sedre says so too and it showed the right order for Highlander's coils

[jasper5]

If you really want a cast iron way of checking left or right sensor disconnect the left hand sensor connection and recheck what PP2000 is reading.

[FarmerPug]

Steve, one question about SEDRE, do you find it takes quite a bit of time to load it up on the computer? I bought a sedre disk off ebay and it seems to take about 5 mins to get it loaded up

I havent used it much yet but after it loads up it seems to work fine.

[markw]

Same here. But after the first load of the day, it can be reloaded instantly from the task bar.

[steve_earwig]

Yep, it takes 2 or 3 minutes to load up but once it's on the "notification area" it'll load in the browser straight away. I'm not exactly sure what it's doing all that time but there's some m-a-s-s-i-v-e files in there (one of them's about 4 gigs) and it runs on java which probably doesn't help.

Few other things:

You don't have to install the complete thing, I can't remember the term it uses but you can do a light install which installs the basic program but you'll need to have the DVD isos ready to load (which it'll ask for). This will lessen the program's presence on your C: drive and make defragging easier, otherwise your defrag program will spend hours shuffling its billions of files about. Just put the isos on a drive you're not worried about dafragging.

RPOs do make a difference (which I first noticed looking at cooling fans where there are several changes through production).

If it won't load a diagram go back to the configuration and select/unselect ESP.

If you select full-mux but put a semi RPO in the box it'll complain but if you select semi-mux and put a full-mux RPO in it won't - can be a bit confusing when you find yourself looking at semi-mux diagrams when you were expecting full-mux ones.

It really hates navigating using the browser's navagation - e.g. page back or open in new window etc. and will crash back to the home page, loosing all the details you entered.

Oh, and this infos fie you have to replace to stop it going out of date, I can never remeber which one it is so the last time I installed sedre I searched the C: drive and replaced the lot (3, I think)

[FarmerPug]

I installed it all onto my netbook because it doesn't have a DVD drive, i got the lend of a friends external DVD drive and put it all on at that time. Other than that it eventually does show diagrams, but thanks for the tip on not using the browsers navigation i have accidentally done that and it simply froze and made me start over again.

As for the ABS
I got into the car this morning and the light has gone, connected up pp2000 and the fault code changed to an intermittent fault which cleared off the system, also doing a parameter measurement for the wheel speed shows that the sensor is now detecting the wheel rotating.
I tried using multimeter, i can see that the voltage, resistance and current all change when the wheel rotates and stay constant when its stationary.

It would appear that the problem has been solved, hopefully.