Three Amigos and rain

**coops71** · 19th June 2013, 02:09 AM

I had been having issues with my right front hub with intermittent low voltage and other errors with the same hub. I tried fiddling with the sensor and resetting with the Nanocom which had some temporary results. The bearing had some play in it so I went the whole hog and got a new hub. Problems solved until about 5000km later when the low voltage error fault popped up again. Reset and all is fine, until it popped up again. Both times it has occured have been after heavyish rain. No issue when dry. I'm thinking a minor windscreen leak into some circuitry. Any other ideas?

Regards
Dave

**BIG O** · 19th June 2013, 08:15 AM

Hi Dave. Is it a short sensor cable or long one all the way back ? Check the connection..maybe also check the sensor is seated properly..

**coops71** · 19th June 2013, 09:08 AM

It's a short lead version. I'll see how it goes today with a lack of rain. Might think about the long lead version later on.

**bsperka** · 19th June 2013, 11:52 AM

Originally Posted by coops71

It's a short lead version. I'll see how it goes today with a lack of rain. Might think about the long lead version later on.

May be stating the bleeding obvious - Have you tried reseating the connector between the sensor and the ECU? If so, some electrical paste and / or self healing tape may stop it from reoccurring.

If it's low voltage in rain, there may be a high resistance being caused by moisture. Although a recent post by danny_bristrol indicated that his channel went faulty. Might be worth try his fault finding technique?

**coops71** · 19th June 2013, 12:09 PM

Originally Posted by bsperka

May be stating the bleeding obvious - Have you tried reseating the connector between the sensor and the ECU? If so, some electrical paste and / or self healing tape may stop it from reoccurring.

If it's low voltage in rain, there may be a high resistance being caused by moisture. Although a recent post by danny_bristrol indicated that his channel went faulty. Might be worth try his fault finding technique?

I was thinking of the same thing. I might hit the area with some circuit cleaner first. Cheers.

**coops71** · 13th July 2013, 06:47 PM

So after 3000km I get the three amigos again. I decided rather than clear the fault I will reseat the connectors on the Wabco modulator after cleaning with electrical contact cleaner. Cleared the fault. Turned on engine an now have three amigos before I even drive off. Fault code shows: Right front sensor failure. It used to only be a low voltage fault. To my surprise it even throws this code when I have the yellow connector with the wheel sensors disconnected. Crazy!! I still think moisture may have something to do with this. Rain and turning the air con off seem to initiate it. I've also noticed dampness on sound insulation behind the passenger kick panel. Maybe pull the Wabco modulator apart and clean with spray? Ideas greatly appreciated.

**bsperka** · 13th July 2013, 08:55 PM

Modulator doesn't get a feed from the sensor, so you won't achieve anything useful with this. May be moisture getting into the SLABS or its connector. The modulator has switches to sense the brake pressure and solenoids to operate the valves that modulate the brake pressure. Chase the fault from the sensor to the SLABS.

**coops71** · 13th July 2013, 09:25 PM

Originally Posted by bsperka

Modulator doesn't get a feed from the sensor, so you won't achieve anything useful with this. May be moisture getting into the SLABS or its connector. The modulator has switches to sense the brake pressure and solenoids to operate the valves that modulate the brake pressure. Chase the fault from the sensor to the SLABS.

Sorry, I meant to say the SLABS module. I disconnected the yellow plug and it still gets failed right front sensor. Something adrift in the SLABS I guess.

**Pedro_The_Swift** · 14th July 2013, 08:53 AM

I wouldnt have thought you could still buy two-part cables,,
measuring the output at the mid-way connector will help confirm the fault.

**bsperka** · 14th July 2013, 09:46 AM

Try the speedo test, as per this thread. http://www.aulro.com/afvb/discovery-...-3-amigos.html BTW: driver's front was also faulty with his vehicle. Ended up being a faulty channel in the SLABS. Perhaps there is a manufacturing fault trend starting to appear, or the age of the vehicle / component ?

If so, then it would be worth pulling the SLABS out and looking for a dry joint / high resistance joint in the unit, around the input circuit from the sensors.

The speedo gets its vehicle speed signal (VSS) from the abs sensors and in the case of an auto, from the auto transmission as well. Lift the front right (use jack stands etc and chock back wheels and other safety precautions), start the engine and engage first and see what the speedo does (perhaps note revs to compare speed reading to front left?). Then the front left. If no speedo reading front right, then swap them over and see if the front right is now ok. If so, sensor is faulty. If not, then either wiring or channel in SLABS is faulty.

Or go straight to the SLABS unit.

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