Thread: I'm Back!!!.... 2005 Disco 3 Issues Transfer Box

More often the TC gets stuck in low range, for which the fix is usually just an oil change and recalibration.

Love your new beast. Pics thanks.

LED brake lights are one of my big tips. My former 2005 D3 was sulked badly and highly inconstantly with any globe blowing. LED globes fixed that for me. Sounds like you might have saved a few pennies allowing a margin for fixing the minor issues which you have.

Fairly certain the Transfer Case ECU is going to be the cause of my issues.
The Plastic Container it was in wasn't sealed up... and the connector is covered it dried up mud/gunk etc..

Not Certain exactly how the box is supposed to seal up.

Anyhow I've given the connector a clean... and the ECU a clean and I'll let them sit for a while and see if they can be resurrected.
If not probably time for another off Ebay UK.

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Welcome Back

i was looking at doing something similar but got put off by the crazy bidding at the end of the auctions . Hopefully yours is some simple fixes.

i ended up getting a RRC in the end but we still have our D3 so sort of the best of both worlds.

look forward to seeing how you go .

Cheers Ean

Same issue occurring still after the clean... I'd say the ECU is all shorted/dead/cactus on the inside.
On the upside it still works fine in High Range Only so I'm not overly concerned.

I'll order the replacement ECU ex UK on Ebay and see if that resolves the issue.

Originally Posted by BusinessConnected

Same issue occurring still after the clean... I'd say the ECU is all shorted/dead/cactus on the inside.
On the upside it still works fine in High Range Only so I'm not overly concerned.

I'll order the replacement ECU ex UK on Ebay and see if that resolves the issue.

The bottom of the box is not sealed on any D4 or D3 so you need to be careful in deep water or when cleaning under the engine bay. GOE's book tells you how to temporarily seal the underside the TC ECU box for a trip where deep water might be encountered. I have had water over the bonnet for a few seconds at Cape York but the engine bay stayed dry due to the bonnet seals etc. That won't work for longer crossings, however.

And known to be damaged with over enthusiastic high pressure engine bay washing

Usually when the TCCU develops faults it fails to pass HS canbus messages from the ecus further along the bus, including the suspension ecu. The TCCU is a HS canbus gateway that isolates the engine, brake and gearbox ecus from all the others so if it fails then there will usually be lots of communication faults logged for all the modules that can't communicate with the others that they expect to. Hence I doubt that the TCCU is damaged and re-calibrating the TC motor easy to do with a diagnostic tool so why not try it first.