So, I have the Three Amigos, and before I started tearing apart the ABS pump I went out and bought myself a nice new Autel AL619 scan tool so I could read the codes and see what was wrong. I get three codes, none of which have anything to do with shuttle valves:
1: "PWM signal failure from engine ECU." I don't know what to make of this one. I'm searching the Rave but not finding any clues yet.
2: "Rear Left sensor output too low"
3: "Front Right Sensor signal erratic"
These last two seem straightforward enough. I was thinking it could be the connectors, and a video on the Atlantic British web site implied as much, but having taken the right front one apart and finding it in perfectly clean condition, I can't see how these can ever go bad. They're very well made and O-ring sealed against moisture. Do the sensor probes themselves go bad?
Rave says to replace ABS sensor and hub as a unit, but it looks like no one ever does that since the parts houses all seem to stock replacement sensors without hubs. I see two types; an OE type that wires into the existing connector and a long tail type that you're supposed to splice into the harness at the SLABS ECU. I guess the second type is intended to get the connections out of the weather, but it seems like a lot more work to install, and they're a lot more expensive.
Does anyone have an experience they'd like to share regarding the different types of sensors, long and short tail, or resolving the PWM error code? Thanks.
BTW, the Autel AL619 scan tool, once you have it updated and the Land Rover software installed, really works a treat for a very reasonable price. I needed a new scanner because my AutoXRay bit the dust, and this one seems to offer a lot more for a lot less. But that's a different post I guess.