ABS 2 Fault Code 13 - Plunger Test Fault - how to rectify?

[MikeO]

Hi there,

About two weeks ago, whilst in the cruise on a freeway, both ABS lights on Jorg's 2002 ABS 2 (non-servo) 1150 GS Adventure started flashing together. No combination of restarting, pushing the ABS button (out of optimism) worked. Jorge tried shorting two pins in the diagnostic plug using a piece of wire, after reading advice online, but this had no effect.

Help was offered in the shape of a GS-911 Diagnostic tool from soyanarchisto on ADVrider, who very generously lent his to Jorge...

We followed the quick start instructions and downloaded the software onto a borrowed laptop (GS-911 doesn't play easily with Mac), then connected the device to the diagnostic plug, located just above the air filter, and asked the device to search for faults...

OK - Fault Code 13 - Plunger Test Fault.

First rule of electronic diagnosis - delete the code and see if it comes back. It doesn't immediately, so Jorge gets togged up and rides it up the road and back.

As half-expected, the same code came back. With neither of us able to remember how to take a screenshot from a PC, we both took a pic...

OK - so we know what the fault is - can anyone give us some pointers as to how to rectify it please?

Thanks in anticipation,

Mike

 

[albatross]

Morning Mike

have a read of Paul’s write up…
could well be debris in there?

R1150GS ABS fault sorted...

OMG!! I don't believe it but I've had a plunger test failure issue for some time on my 1150. You know the one... Pull away, & get a louder & more metallic kerplunk than usual, followed by alternate flashing abs lights. I even had it looked at by Roy Gardner who cleared the faults & reset...

www.ukgser.com

 

[Two wheels good]

You could try bleeding the fluid at the ABS module and - if the error stays reset long enough - activiating the ABS with some hard braking.
BTW With the GS911 to hand it's worth checking the TPS position.

 

[DrFarkoff]

All I can say is IF you decide to lift out the pistons

Clean the area well with brake clean and an airline before hand

Cover the ports with clean cloth whilst away from the openings

and use FINE scotchbrite (Grey I think) to polish up surfaces and clean everything and lube it with fresh brake fluid at reassembly

 

[Ian J Hartley]

The write up by Terry on disassembly cleaning and reassembly of the ABS 2 has disappeared unfortunately.

Which is a problem as it was downloadable in pdf format.

However, it is available to view here.

https://issuu.com/lord_dimos/docs/bmw_abs_ii_d_a

I do have a pdf copy if anyone is interested.

 

[MikeO]

Morning Mike

have a read of Paul’s write up…
could well be debris in there?

R1150GS ABS fault sorted...

OMG!! I don't believe it but I've had a plunger test failure issue for some time on my 1150. You know the one... Pull away, & get a louder & more metallic kerplunk than usual, followed by alternate flashing abs lights. I even had it looked at by Roy Gardner who cleared the faults & reset...

www.ukgser.com

Excellent Albatross - exactly the sort of thing I was hoping someone would reply with - many thanks

 

[MikeO]

The write up by Terry on disassembly cleaning and reassembly of the ABS 2 has disappeared unfortunately.

Which is a problem as it was downloadable in pdf format.

However, it is available to view here.

https://issuu.com/lord_dimos/docs/bmw_abs_ii_d_a

I do have a pdf copy if anyone is interested.

It's still there as a .pdf - I've just downloaded a copy Ian

LInk