Vehicle & Technical > Discovery

TD5 Centre Diff Lock

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thermidorthelobster:
Yes, if your TD5 was supplied with CDL fitted then it's wired for them both to act together.  But if you fit an earlier TD5 with CDL then by default the SLABS ECU disables the TC if you have CDL engaged.  (It's because it thinks the CDL is only ever going to be engaged manually during dealer servicing, so if it comes on something must be amiss.)

You can modifying the wiring to the ECU quite easily so that it doesn't disengage the TC when Diff Lock comes on, which consequently behaves similarly to the later CDL-equipped models.

Details in the Workshop section of Mud-club.

andycwb:
Ah.  Now I understand.  


For small values of "understand", anyways.

thermidorthelobster:
The manual for the early TD5s says if the diff lock light comes on, it's because the dealer's engaged it and forgotten to turn it off, so return it to the dealer.

Mine did come on of its own accord once before I had the actuator fitted;  I think it had just vibrated its way on.  The TC only gets disengaged on startup, so if you haven't changed the ECU wiring you can get around the ECU disabling the TC by only switching CDL in after you've started up the engine.  But then it's a bit of a kerfuffle if you stall.

Ben, by the sounds of it you've already worked this out but if you can get the serial number off the transfer box, you can find out whether it's got the spigot fitted.  (Or of course you can just look for the spigot.)  Ashcrofts say that if it starts 41D or 42D then you're OK;  if it starts 61D, 62D, 69D or 70D then you'll have to shell out another £225 to add in the spigot.

Ben:
Cheers guys - I'll pass that all on! Very useful information.

I might be in the market for one myself as well, so doubly useful!

Cheers

Ben

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