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Hello!
A week ago I took this car for repairs. The problem is that the automatic transmission does not want to switch the 5th gear.(all gears switches at 2.2-2.5 on tacho,fifth just does not switches) Customer told “don’t fix it, just replace new AT”. Ok then, replaced. But, problem remained. After replacing, EGS was reprogrammed, all wires checked, oil level is perfect.
I have Launch – x431, and diagnosis shows NOTHING. All systems is OK. I tried to diagnose with DIS, result was same.
Then I picked up the car on the lift and tried to go. All works great. But as soon as I try to drive on the ground, the problem repeats itself.
And now i stopped work with this car, because i have no idea what to do. Before this problem he had only broken TPS, but it was replaced and works very well.
Please, guys, help me. May be someone know something about this problem.
P.S. sorry for my english 😉 Also, he has japanese AT called “JATCO”
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In order to do a proper diagnosis you need to use a transmission oil psi gauge and a service manual to tell you what those pressures should be and where to find them. Automatic transmissions depend on pressure to operate properly. If the pressure isn’t in the right place at the right time it won’t work properly. More info here.
http://www.ericthecarguy.com/faq/solving-transmission-problems
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