The transmission (4L65E) is only shifting from second to third if I let go of the throttle. Then it will go to third and fourth. If I do not let go of the throttle, it will increase revs to 5000 6000 without shifting up and of course speed will not further increase after that. Let throttle go, and it will shift, and I can accelerate to any speed I want. Third to fourth goes smooth. There seems to be no slip at all. It seems the computer just does not give the signal to shift up to the transmission. I replace the output speed sensor. It improved a little. Cabling of OSS is good.
I connected ODBII and I can see that the computer indeed does not give the order to shift to third, unless I let go of the throttle. Gear ratio is stable in each gear, no slip. But the rpm's that the indicator and ODBII give seem to be correct. So that should show a good Input speed sensor, right? Or is that different?
There are no fault codes. Well, there are, but not related: C0196 (yaw rate sensor) and P0496 (solenoid valve).
What can it be?
have the same problem?
Wednesday, January 3rd, 2018 AT 3:27 PM