D2 shuttle valve issues

[reb78]

I know we have a few other d2 owners on here who have been through this.

I am getting the 3amigos and shuttle valve switch failure when I look at tge faults.

Can anyone point me to a how to for the fix for this?

@Wozzaaah is this the fault you had that I have seen you mention before?

 

[Kayos]

Is this the earth wire mod?

You know you are a D2 owner when you don't even slow down or look at the dash when it makes the fault bong noise

 

[reb78]

Is this the earth wire mod?

You know you are a D2 owner when you don't even slow down or look at the dash when it makes the fault bong noise

I think so, but there seems to be more to it and needs the valves replacing too. Most of the write ups jump in amd just do the mod but dont exactly explain the fault and quite what the mod does.

Bongs are better in this than the later models that seem to throw a hissy fit for some faults, drop the suspension to the bump stops and immediately limit you to 50mph. Imagine that in the outside lane of a motorway!

 

[Wozzaaah]

Yes, I did the earth wire mod and have had no problems whatsoever since. I did buy a replacement switch module which I’ve never needed to fit.

 

[reb78]

Thanks for that.

So am I right in thinking that the process is to remove the existing switch pack, test it with a multimeter and if good perform the wiring mod on that. If bad, replace it with a new unit with the wiring mod?

Does the fault usually occur because of a wiring fault inside the modulator then? Oh, and is the the right fault to solve this way? Shuttle Valve Switch Failure? Testing with Hawkeye, the shuttle valves fail the test. The three amigos are intermittent currently. Stayed off for several hundred miles and then back on after a couple of miles yesterday.

 

[reb78]

Nanocom connected about 2 times out of ten. It was quicker to go find the hawkeye in the other car and use that instead.

 

[Wozzaaah]

Thanks for that.

So am I right in thinking that the process is to remove the existing switch pack, test it with a multimeter and if good perform the wiring mod on that. If bad, replace it with a new unit with the wiring mod?

Does the fault usually occur because of a wiring fault inside the modulator then? Oh, and is the the right fault to solve this way? Shuttle Valve Switch Failure? Testing with Hawkeye, the shuttle valves fail the test. The three amigos are intermittent currently. Stayed off for several hundred miles and then back on after a couple of miles yesterday.

Yes, that is correct. The fault is caused by corrosion, by doing the wiring mod you simply create a new earth to replace the corroded one. You may find the old unit is still perfectly serviceable, as ours was (and still is).

 

[reb78]

Excellent. Thanks Wozzaaaah. So I might chance it and remove and test the current switch pack without buying a new one first.

Do you need to bleed afterwards or doesnt it open up the fluid galleries?

 

[Wozzaaah]

No need to bleed as the switch side is separate from the fluid side.

 

[armalites]

Here is a very good write up on the root casue of the issue, it really bugs me when I see the bodged wiring people do on D2 and then tell how they've made it better.This ABS module is used in quite a few vehicles and issue is caused by dry joints on a PCB. It really doesn't take that much longer to do the job properly instead of bypassing the wiring.

Hummer’s Meritor Wabco ABS Modulator

 

[reb78]

Here is a very good write up on the root casue of the issue, it really bugs me when I see the bodged wiring people do on D2 and then tell how they've made it better.This ABS module is used in quite a few vehicles and issue is caused by dry joints on a PCB. It really doesn't take that much longer to do the job properly instead of bypassing the wiring.

Hummer’s Meritor Wabco ABS Modulator

Thats excellent. Thanks!

 

[Craigrob]

Here is a very good write up on the root casue of the issue, it really bugs me when I see the bodged wiring people do on D2 and then tell how they've made it better.This ABS module is used in quite a few vehicles and issue is caused by dry joints on a PCB. It really doesn't take that much longer to do the job properly instead of bypassing the wiring.

Hummer’s Meritor Wabco ABS Modulator

I thought that the common issue was that the internal connector (rather than the PCB to which its attached) corroded and resulted in an intermittent connection. Cleaning connectors can be a bit iffy and so most just remove the connector from the equation by providing a wire connection from the switches to the loom itself. I guess you could replace the connector entirely but its quite an involved fix.
Did the bypass wiring on the previous D2 - problem solved. Not happened on the current one - yet! Same symptoms as the OP, occasional 3 amigos but would clear itself on a switch-off/on and reoccur at random.

 

[blackolive (Ste)]

Shuttle valve electrical fault disco 2

New Land Rover owner alert! I've had the discovery for a few months and three amigos kept coming and going, finally got it plugged in and the reading was a shuttle valve electrical fault, been told would need a Land Rover specialist too look at it as my mechanic doesn't want too **** the motor...

www.landyzone.co.uk

Option B fix. Also gives you the expected resistance values to measure before you refit

 

[reb78]

Great. Thanks.

I'm on 165k after about 12 years of ownership and pleased this common problem has taken so long to occur! The result was i have never really paid much attention to or tried to understand the problem or the fix! But... i do now. Thanks for all the links.

 

[Bobupndown]

D2BC is the go to site for all such shenanigans. I loved my Discovery 2 but it did like plenty of repairs and money spent on it

 

[reb78]

Well. It took me 4-5 months to get to it. But wiring mod now done. There was nothing wrong with the switch pack.

With the Febi/Bilstein bushes (bearings really) fitted to the watts linkage, I think we can safely go for the MOT.

 

[blackolive (Ste)]

Well. It took me 4-5 months to get to it. But wiring mod now done. There was nothing wrong with the switch pack.

With the Febi/Bilstein bushes (bearings really) fitted to the watts linkage, I think we can safely go for the MOT.

Nice one fingers crossed