Hi,

at 476,000 km the CVT on my brothers Colt is playing up.

Pressing down on the accelerator pedal doesn't result in any revving if it is in drive, reverse, second or low.

If it's in Park or Neutral it does rev.

I just changed the transmission oil and it was fairly dirty with a lot of metal on the magnetic sump plug.
It had been changed about 60,000 km before (419,000 km).

Sometimes it won't rev in Park either... but only for a brief moment.

My brother has been getting it to engage by revving it in Park then dropping it into reverse... and then back into drive. This is somewhat dangerous and very inconvenient.

The ECU light is not on and there are no other error signals on the dash.

This sounds like either a mechanical or electronic problem.

Can someone help narrow this down further? Which part is causing the problem?

:-)
This is an Australian Colt. It's been very reliable, the engine still has maximum as new compression and it still looks pretty good... so we don't want to scrap it unless it's absolutely necessary.

PS. Put an SP II rated auto transmission oil into it before realising the manual specifies SP III... although I doubt that's the problem as it was doing this before. A clean oil change is still better than dirty oil?

The dirty oil in the CVT is probably due to my sister who owned the car previously and failed to change the CVT oil at the specified interval. Thus the last oil change was probably overdue by a fair bit (90,000 km specified).