I already found that problem is 99.99999% in transfer actuator assembly. See picture. It is on back side on
gearbox below the car.
Though it is now in H4 mode (thanx God! car going "fast") 4WD ecu probably reports it is in L4 mode.
So it says Check VSC system.
Then finally somehow it finds out it is really in H4 after driving the car so errors (Xmas tree) on dashboard
disappeare. But DTC C1268 remains and not possible to clear.
We can not change H4 L4 (we did once, do not do it unless you know car is OK). We could not get back
to H4 to use the LC200 normally, real pain in ass. Then next day driving L4 (50km/h) leaving car in
parking place re-think all what is going on - we retried and wuala! It is back on H4 but with
C1268. This error must have been there already for ages as sometimes starting the car we got
Xmas tree. Switching off, waiting 10 seconds and it was gone. Until now always.
It is very likely contacts in transfer shift assembly below the car is damaged by water? It is the bottom
part with small DC motor like from RC model. It can act as a small swimming pool for water that
could get in. I can imagine it easily: connector is upward, so if connector is not sealed
well then water can gradually collect inside leaking in around contacts. Until now did not have
chance to look at it.
To remove complete transfer shift assembly is nonsense as half of automatic gear box would
have to be removed!!!!
Toyota!!????? Are your designers complete!?
I attach picture. If anybody knows if it is possible only to remove DC motor responsible for
H4L4 transfers? I am sure it is damaged by water inside. It is a bottom part of transfer
shift assembly. Top part is for locking center differential with its own second DC motor.
I am aware that toothed wheel with contacts MUST remain in the car otherwise there is
a risk the wheel after reassembly would not be in a correct position. Also neutral contact is
driven by metal round shaped piece attached to this wheel. I need to remove only bottom
cover with small DC motor and small gears. The big toothed wheel MUST remain inside as it
has got on it "preprogrammed" contacts controlling final position of rod with forks moving
wheels inside car automatic gear box.
It seems that critical wheel must be somehow mechanically held in position above always in
mechanical contact with teeth on the rod as it can not sit on the spring electrical contacts!?
Has anybody ever opened/removed bottom cover from actuator?
How to do it? Not to remove that critical wheel.
On the picture it is seen clearly that circles on the bottom part with motor are conductive and
on them those spring contacts on critical wheel are moving sending info about position to the 4WD ecu.
Just underline again: I want to remove piece on bottom left part of the picture. I know neutral contact
might be also a problem, but now it is in correct position H4 so it should not be in mechanical contact.
For reassembly I to not see this as a problem - some sticky tape can help that can later be pulled out
before final closing.
Thank everybody for possible help. I can add more info if needed.
