Thread: Transmission fault/HDC fault

Replaced my brake control switch today so hopefully will be error free for a while to confirm this. I used the guide provided by bbyer a few posts back and it is spot on.
Took longer to pull the old switch apart than replace it.
There was some black powder in the assembly and you could see where the internal contacts were rubbing. Obviously the old switch was still working but I guess it was possible it could fault ocassionally. Time will tell.

Perhaps clean-up the old switch using contact cleaner to swap back when the new one starts to go.

Cleaning the contacts has merit, particularily if somewhat distant from a LR dealer. An alternative to consider that just may be viable is to use the Ford part number for the switch which I presume would be available from or thru a Ford Australia dealer. The 2008 and 2009 Ford Fusions used the same switch as do our 3's, and I guess now the 4 as well.

There are two Ford Motorcraft part numbers for the switch as follows:

SW-6572 and 7E5Z-13480-A

Originally Posted by bbyer

Cleaning the contacts has merit, particularily if somewhat distant from a LR dealer. An alternative to consider that just may be viable is to use the Ford part number for the switch which I presume would be available from or thru a Ford Australia dealer. The 2008 and 2009 Ford Fusions used the same switch as do our 3's, and I guess now the 4 as well.

There are two Ford Motorcraft part numbers for the switch as follows:

SW-6572 and 7E5Z-13480-A

I recently bought a spare from my local dealer and when I took it out of the Land Rover box and had a look at it, it clearly had FoMoCo stamped on the back of it.

Lou...

Got the faults again this morning with the new brake switch. Actually it repeated a couple of times before it cleared. New switch didn't fix the problem. If it actually occurs more frequently with a new switch probably means it is switch related. Will need to monitor for the next month or so.

Multiple faults are also caused by a dirty MAP sensor -
see DISCO3.CO.UK - View topic - Engine System Fault
Symptoms will be loss of power, multiple fault messages (HDC, Park Brake, Transmission, Limited gears), lowered suspension etc.
May occur once or several times in short succession and then may be OK for a few days of weeks but will gradually become more frequent.
Easy to clean as described in the link above so worth doing to eliminate it as a cause of problems.

Just read the linked post in the disco3 forum. A couple of the guys talk about the benefits of adding 2So to their tanks when they fill up. what do you think? Any down sides to doing this?

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This morning I checked the MAP sensor as a matter of routine servicing and again it was sqeeky clean. So yes 2sO works and helps the friendly D3 owner to prevent unloading unnecessary repair $,£, ZAR etc at the stealers.

Our vehicle had the dreaded HPFP/Injector collapse in Botswana last year at 130'000km and came back to Pretoria on a low-bed truck. I advised the previous owner at that time to start using 2sO and despite various trips to Botswana, Zim, Zambia etc with its notoriously bad (paraffin spiking!!) diesel, there has never been an issue again with lubricity related problems. An added benefit of using 2sO is the fantastic internal cleaning properties of 2sO (removal of carbon deposits)!!!

I am using the Sasol 2sO, as it is Jaso-FC graded and available at every Sasol station in the country. If I do longer overland trips I carry a supply of those bottles (200ml) with me. On the D3 I use 200ml per tank and on the 300Tdi 500ml per tank.

On the 300Tdi there is a marked increase in performance with a corresponding drop in smoke when running at a 1:200 ratio.
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More faults this evening that took a couple of goes to bypass. Seems problem is worse with a new brake switch. Does this mean the plug or some sort of feedback to the connector is a possible cause of the fault? Also seemed on a couple of times that the car didn't want to crank over. Stopped and started a few times after a 10 min drive and all good again.

or.... battery....