ABS fault with no fault codes

kermit_rr · Nov 2, 2022

Put an additional earth in place, eg a jump lead to the engine
Make sure you don't leave any grit off the sandpaper

domlinson · Nov 2, 2022

kermit_rr said:
Put an additional earth in place, eg a jump lead to the engine
Make sure you don't leave any grit off the sandpaper

Thanks kermit, do you mean from battery neg to the engine, or from the ground point connections to the engine, so that they're still connected to ground whilst I'm doing the cleaning/sanding?

Thanks

Datatek · Nov 2, 2022

domlinson said:
Still no progress on this annoyingly.

I've had a look at the body ground points in the engine bay (one under the fusebox/coolant reservoir, and the other on the opposite wing near the EAS unit)... both of these are fairly rusty and I believe the ABS system is grounded through these points.

I think I'll clean these up with some sandpaper just as cheap insurance.

Does anyone have any tips for doing this? I don't really like disconnecting the battery on my P38 as I end up needing to put the EKA code in which I feel is asking for trouble... Is it OK to disconnect and clean these ground points whilst the battery is installed? That also sounds like it's asking for trouble... not sure which is worse haha.

Thanks again

Turn off EKA and the immobiliser with Nanocom then you will have no more trouble when disconnecting the battery.
You can clean the earths without disconnecting the battery but may get some odd things happening.
Do not use sand paper, use 600 grade wet or dry paper dry as it will not leave grit behind.

kermit_rr · Nov 2, 2022

domlinson said:
Thanks kermit, do you mean from battery neg to the engine, or from the ground point connections to the engine, so that they're still connected to ground whilst I'm doing the cleaning/sanding?

Thanks

Between battery negative and the engine block, you might have a convenient engine lift point

Mark Piercy · Nov 2, 2022

Put the ignition on and off and disconnect the battery within 17 seconds? Is that right? Never had an issue with either of our two doing it that way but as said if you have the facility to turn it off I would

kermit_rr · Nov 2, 2022

Mark Piercy said:
Put the ignition on and off and disconnect the battery within 17 seconds? Is that right? Never had an issue with either of our two doing it that way but as said if you have the facility to turn it off I would

Yea that's it.. loosen the terminal first so it pops straight off

domlinson · Nov 2, 2022

Mark Piercy said:
Put the ignition on and off and disconnect the battery within 17 seconds? Is that right? Never had an issue with either of our two doing it that way but as said if you have the facility to turn it off I would

kermit_rr said:
Yea that's it.. loosen the terminal first so it pops straight off

I've only done it once, but I followed the procedure above as per the manual/Rave... According to the manual; removing the negative terminal within 17 seconds is purely to stop the alarm from sounding... My alarm didn't go off so I know that I'd disconnected within the 17 secs, but upon reconnection neither of my fobs would lock/unlock remotely and I had a real fiddle trying to get them both working again... Had to perform the EKA multiple times, and then only one key worked... and then randomly after a couple of minutes they both started working.

After that I said I'd like to do this as little as possible haha.

DanClarke · Nov 18, 2022

But is the ABS fault fixed yet?

domlinson · Nov 18, 2022

DanClarke said:
But is the ABS fault fixed yet?

I wouldn't say "fixed"...

I've sorted my leaking pollen filters out (took 3 attempts at sealing them but got there in the end)... Whilst I was sorting them I checked the OBD port out which I think you'd mentioned before, and water was actually dripping out of it after it had rained...

I started it up and tapped the OBD port and I could reliably trigger the ABS fault to pop up and beep on the dash...

Cleaned all the pins and dried it out thoroughly, but it still pops up with "abs fault" at ignition on. Maybe it needs clearing? Not sure how that works.

Datatek · Nov 19, 2022

domlinson said:
I wouldn't say "fixed"...

I've sorted my leaking pollen filters out (took 3 attempts at sealing them but got there in the end)... Whilst I was sorting them I checked the OBD port out which I think you'd mentioned before, and water was actually dripping out of it after it had rained...

I started it up and tapped the OBD port and I could reliably trigger the ABS fault to pop up and beep on the dash...

Cleaned all the pins and dried it out thoroughly, but it still pops up with "abs fault" at ignition on. Maybe it needs clearing? Not sure how that works.

There could well be verdigris between the pins on the OBD connector causing the problem.

domlinson · Nov 19, 2022

Datatek said:
There could well be verdigris between the pins on the OBD connector causing the problem.

Good point..

I cleaned each pin with a pick and wd-40 specialist contact cleaner and the intermittent issue has gone, it will only throw the abs fault message up on the dash once and then never again..

Is there an easy way to remove the pins from the OBD port so that I can ensure they are thoroughly cleaned?

If not I guess I could buy a new OBD socket and cut and re-pin..

brianp38dse · Nov 19, 2022

New socket would probably be the way to go as if the pins are corroded they can snap easy.

DanClarke · Nov 19, 2022

domlinson said:
Good point..

I cleaned each pin with a pick and wd-40 specialist contact cleaner and the intermittent issue has gone, it will only throw the abs fault message up on the dash once and then never again..

Is there an easy way to remove the pins from the OBD port so that I can ensure they are thoroughly cleaned?

If not I guess I could buy a new OBD socket and cut and re-pin..

Well that sounds like a real result and it is also what I said in post #79 lol.

domlinson · Nov 19, 2022

DanClarke said:
Well that sounds like a real result and it is also what I said in post #79 lol.

I should have tried checking it sooner!

Thanks again for your help all - I'll get there eventually with this abs thing!

Datatek · Nov 19, 2022

brianp38dse said:
New socket would probably be the way to go as if the pins are corroded they can snap easy.

Plus 1 ^^^^^^^^^^^^^^^^^^^

ABS fault with no fault codes

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Mark Piercy

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