Sounds like a faulty Diff Lock switch to me.
Most of the D2 models
till late 03 model year use a version of firmware on the SLABS ECU that
when diff-lock is detected puts the ABS and Traction Control systems
into a lower response mode. Late model vehicles came with factory fit
diff-lock linkages as a option, and the firmware was revised to allow
this to operate in conjunction with the traction control.
Therefore
ABS and TC illuminating (but with no HDC) means your TC/ABS is in the
lower performing mode, and your diff-lock may be in, but more likely the
£12 switch has broken, and needs replacing. It's a bugger of a job, and
can be done from underneath the vehicle (did mine this way) the switch
is p/no PRC2911, and just unscrews. It's located just behind the
diff-lock stud above where the front prop fits.
Your options are
thus:
1) Remove the front prop. Work blind and try and change it by
feel alone. Helps if you can clean the area off before too, don't want
any rubbish falling in the box! Unplug & Undo the switch, IIRC it's a
12mm head, and a stubby spanner is the tool for the job. Remove, swap
the lower nut from the old switch to the new one (important for the
length) and put back in. Don't do up too tight, or it may shear off (as
my friend did 2 days after I did mine! He kept tightening it...) Pop the
connections on and the front prop and the fault should go away. You
could also just disconnect the switch if you want. IIRC open circuit is
no-diff lock anyway, but if that's not correct then make up a link with
some spade connectors and link it out then.
2) Remove the centre
console, drill the rivets and attack from above. Same tools needed, just
you can see what you're doing.
I favoured Option 1. YMMV!
Your whirring noise and loss of power may indicate the diff-lock is engaging occasionally and may indicate damage to the transfer box.
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