Have a 120 series Prado with a 4 speed auto box and 1KD engine.
When it is driven on steep slopes going uphill the AT light comes on. Usually within 15 minutes of it climbing. Engine has plenty of power but light comes on. It very annoying and have to wait 5 to 10 minutes for it to cool. Then it comes on again within 5 minutes of continuing on the uphill. This happens for example on the road to Shogran.
Is this normal? Fluid was changed but still the same problem. Why would Toyota make a 4x4 that cannot go up steep hills?
Any help or insight would be appreciated.
Thanks