I had been free of the Three Amigos for a little while but they have re-appeared and the code is:

Fault 4012 Pump Failure 1 (High level at X2 Pin 8 without pump actuation)

Any thoughts on a cause and how to fix?

Background: I previously had fault code 4022 Earth not connected to ground.
The ground wire to my ABS module was broken. I repaired the wire and cleared the code.

 

Which pump? ...................if the 3 amigos are showing it has nothing to do with the engine malfunction as they are different Control Unit's. There are multiple faults that create the 3 amigo scenario, battery power or earth grounds, wheel sensors or connections, SVS faults etc.

 

I believe the ABS pump. I was trying to do a power brake bleed with my Hawkeye and the ABS pump actuated for a few seconds but then stopped and would not come on again. I checked for codes and the 4012 code (Pump Failure 1 - High level at X2 Pin 8 without pump actuation) was present and cannot be cleared.

I cannot find any information on the cause or how to fix.

 

The pump and motor are the round lumps on the back of the modulator

https://www.ebay.com/b/ABS-System-Pa...560/bn_1421908

You will need to remove these to test the motor or replace the whole Wabco unit with a new or used item.

TBH I have never come across a pump/motor failure in a Wabco unit to date.

PS: Check with either Abran Abeyta or Paul Grant they may have a Wabco unit and/or have more knowledge of the ways to test them.