P38A The dreaded Traction Control & ABS Fault lights.

DanClarke · Jun 5, 2021

3rd time now. And always the day after a good fast drive in the wet on a potholed P.O.S. bit of UK roadway.
Every time (so far) it has been the OSF ABS Sensor that needs replacing to clear the fault immediately. WHY? What is so special about the OSF wheel?

I would mess with it tomorrow but I have other plans and someone else has borrowed my Axle-stands to prop his 197 mustang up while he has the rear Axle rebuilt.

kermit_rr · Jun 5, 2021

Hmm that's the one I've seen an intermittent fault on. At least according to nanocom

brianp38dse · Jun 5, 2021

Wheel bearing ok

RangeRoller dt · Jun 6, 2021

Would have thought bearing still good at Dans mileage?
Maybe just dirt in there on the teeth or sticky calliper perhaps would explain the playing up when wet. Have to get it up give OSF wheel good wiggle,
If you can get both wheels up the better, has to be some comparable difference between the two

brianp38dse · Jun 6, 2021

Have a check the brake peddle switch is set correct

DanClarke · Jun 8, 2021

OK, thanks to all responders, and apologies for the delay in getting back to you all.
I found a moment to hook up my Nanocom and it says "Front Right Sensor Short to Another 012 Times".
Clear it and it comes straight back. Just like last time and the time before that.

Unfortunately a mate has my HD axle stands down in Surrey and I don't fancy wiggling anything while just on a jack, so it will have to wait.
Can you flush the toothed ring area out with anything (i.e. does any flushing fluid/brake-cleaner drain out of there)? Last time I looked down the sensor tube I thought it was a bit greasy/gritty in there.
But twice already the fault has been immediately cleared with a brand new sensor, so it seems to be the sensors fail for some reason.

kermit_rr · Jun 8, 2021

That error can be shown when there is a wire/connection problem. It showed up on mine when the sensor was unplugged and cleared when plugged back in

RangeRoller dt · Jun 8, 2021

My method is pull the abs sensor then get small flat head or something to scrape the teeth, turn repeat til it’s all clean, then blast it out with compressor (watch eyes) and replace sensor

kermit_rr · Jun 8, 2021

RangeRoller dt said:
My method is pull the abs sensor then get small flat head or something to scrape the teeth, turn repeat til it’s all clean, then blast it out with compressor (watch eyes) and replace sensor

Assuming you can get the sensor out without damaging it! Then there's the sleeve to deal with

Mark Piercy · Jun 8, 2021

DanClarke said:
OK, thanks to all responders, and apologies for the delay in getting back to you all.
I found a moment to hook up my Nanocom and it says "Front Right Sensor Short to Another 012 Times".
Clear it and it comes straight back. Just like last time and the time before that.
Unfortunately a mate has my HD axle stands down in Surrey and I don't fancy wiggling anything while just on a jack, so it will have to wait.
Can you flush the toothed ring area out with anything (i.e. does any flushing fluid/brake-cleaner drain out of there)? Last time I looked down the sensor tube I thought it was a bit greasy/gritty in there.
But twice already the fault has been immediately cleared with a brand new sensor, so it seems to be the sensors fail for some reason.

It could well be a dirty ring... Ooer..
If the sensor faults, it could be it doesn't read the ring as you say. Brake cleaner is good and compressed air as @RangeRoller dt says.

RangeRoller dt · Jun 9, 2021

kermit_rr said:
Assuming you can get the sensor out without damaging it! Then there's the sleeve to deal with

He needs to check the sensor ideally anyhow. Better than removing the hub.

Mark Piercy · Jun 10, 2021

DanClarke said:
OK, thanks to all responders, and apologies for the delay in getting back to you all.
I found a moment to hook up my Nanocom and it says "Front Right Sensor Short to Another 012 Times".
Clear it and it comes straight back. Just like last time and the time before that.
Unfortunately a mate has my HD axle stands down in Surrey and I don't fancy wiggling anything while just on a jack, so it will have to wait.
Can you flush the toothed ring area out with anything (i.e. does any flushing fluid/brake-cleaner drain out of there)? Last time I looked down the sensor tube I thought it was a bit greasy/gritty in there.
But twice already the fault has been immediately cleared with a brand new sensor, so it seems to be the sensors fail for some reason.

You could check to see if there is any voltage coming from the plug to the sensor and compare results with an other side. That would help to rule out system voltage.

Also with the wheel off the ground and the ug unplugged, check the résistance of the sensor and see if it changes when the wheel is turned.

tomcat59alan · Jun 10, 2021

If it's greasy in there it would suggest that the wheel bearing is loosing some

DanClarke · Jun 10, 2021

tomcat59alan said:
If it's greasy in there it would suggest that the wheel bearing is loosing some

This was my fear. Doesn't feel like it's shot when you drive it, but maybe a seal has let go after 17k and 21 years?

tomcat59alan · Jun 10, 2021

DanClarke said:
This was my fear. Doesn't feel like it's shot when you drive it, but maybe a seal has let go after 17k and 21 years?

Way past it's life if it's a Sh1tpart.

Grrrrrr · Jun 10, 2021

DanClarke said:
This was my fear. Doesn't feel like it's shot when you drive it, but maybe a seal has let go after 17k and 21 years?

Only sign when MrGorsky's went was a whirring noise we struggled to pin down.

brianp38dse · Jun 10, 2021

Grrrrrr said:
Only sign when MrGorsky's went was a whirring noise we struggled to pin down.

How is Mr Gorsky and his p38, managed to sort the miss fire.

Grrrrrr · Jun 11, 2021

brianp38dse said:
How is Mr Gorsky and his p38, managed to sort the miss fire.

He's fine but no work has been done. He's looking at replacement lumps although I still think we should take a look at the existing one first. Time is the problem though.

RangeRoller dt · Jun 11, 2021

Let him Stick the V12 jag engine in it

Grrrrrr · Jun 12, 2021

RangeRoller dt said:
Let him Stick the V12 jag engine in it

I need an ECU and loom for that first. Megasquirt cannot handle 12 cylinders.

P38A The dreaded Traction Control & ABS Fault lights.

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