Assalaam O Alaikum,
I have purchased a Mark X few weeks later, now I realise that my car is running on 4 gears only although it have 6 speed auto transmission, gears from 1 to 4 shifts normally,
etc when I m very light on gas (picks it up very lightly) 2nd gear shifts @ speed of 10 km/h,
3rd gear shifts @ speed of 20 km/h,
4th gear shifts @ speed of 35 km/h,
After that it stopped up gear shifting, it runs @60 km/h with 2000 rpm,
@80 km/h with 3000 rpm,
@100 km/h with 4000 rpm,
And becomes very hard on gas, I mean it consume a lot of petrol.
I have discussed this issue to many mechanics and experts, and done these few things
1)changed transmission fluid with Toyota T-IV (it gone about 5 liters in the tranny)
2) cleaned transmissions oil filter
3) reset ECU many times,
After resetting ECU it become a normal transmission and changing all 6 gears, but after couple of hours or a day only it again stuck in 4 gears,
I reset ECU by pulling both battery terminals for some time, after reconnecting battery wires car start in first self but its rpm goes up and down for some time then set around 800 to 900rpm is that right way to reset ECU?
Experts please guide me how to manage, I also contacted to Toyota showroom on Rashid minhas road I think it is Toyota western and asked them for reprogramming of ECU but thay said we don't deal in mark X, I don't want to go to local mechanics,
Your help will ne highly appreciated.
Thanks in advance.