Thanks Dan, I found the info. Actually I am working on a Toyota Alphard with 1MZ -FE engine and U151F Transmission. The transmission has 2-3 shift slipping and no fault codes. Sometimes even slip in D. The NT sensor signal was erratic so I had it replaced but problems remained. I will carry out a pressure test on Monday. Thanks again. By the way do you know where I can find details for servicing the valve body just in case it needs cleaning?

Jimmy Chang
Manager/Engineer
F & M Auto Service Centre
Kota Kinabalu, Malaysia