ABS C1095 Hydraulic
Pump Motor Circuit Failure
Both the Teves 20 controllers I have suffered from intermittent ABS
light staying on until total failure with code: C1095 Hydraulic Pump Motor
I broke one controller open and found bad solder joints on the pins to the pump
motor plug, I re-soldered them and it works fine.
So thought Iíd just drill a hole in the other unit above the pins (22mm hole saw
with no pilot - best done in a pillar drill so you don't go too deep), sure
enough same fault, this oneís now working.
I think the problem is that although the board seems firm enough, itís held in
place with mastic. Whereas the pins are fixed in the case so over time,
vibration causes the joints to fail.
Check out everything else first as this code is fairly loose - just taking out
one of the ABS fuses (canít remember which) will produce it.
Afraid it doesnít come apart easily, which is why I drilled a hole in the second
unit Ė in the hope it was the same (maybe common) fault. Itís well & truly glued
on with some sort of mastic. Thereís a channel all around the base that the
cover is glued into. I had to break the plastic all around the base then
gradually lever it off with a wide blade. Looks a bit of a mess but you should
still have the inner part of the channel left on the base and the lip left on
the cover so a decent mastic should still be able to seal it.
First you need to get the locking washers off that go under the mounting screws.
Push something pointed into each hole in the washer in turn and lever it up. I
used an old pair of pointed tweezers, maybe a dart would do.
The board is covered in soft clear mastic that you have to remove around the
pins to inspect the solder but it scrapes off easily with something soft like a
If drilling a hole just make sure you donít go too far, a pillar drill with a
depth stop would be best, that way you can use a hole-saw without using the
I used a 22mm hole-saw as it was the largest I had that would stay on the flat
surface in the corner of the cover over the pins Ė keeping on the flat makes it
easier to glue something over the hole.
Hope itís not given anyone false hopes.
I thought if enough people had old dead units they could drill into we could see
if it is a common fault.
Thanks to Dave H for this page