vs automatic with no gears unless selected with shifter

[mr031]

HI there, im trying to help someone out with a vs v6, there automatic wont shift gear unless manually selected! they said they have changed ecus and all fuses are fine, has anyone come across this problem of have a auto wiring diagram?? Cheers

[BlackVXGTS]

Number 17 of 4L60E common problems & failures:

No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. Remove & Repair transmission. Try not to run or drive the car or further damage could result.

[hako]

Try running the error codes: Checking error codes VR/VS (Revised)
Could be the throttle position sensor (TPS) buggered and telling the ECU that the throttle is closed all the time or the Vehicle Speed Sensor (VSS) buggered and telling the ECU the car is stationary all the time. There are tests for these sensors in the Gregorys manual.
If car drives OK manually and has reverse it should not be the sun gear or sprag broken.

[mr031]

cheers for the info, was thinking vvs. but wont know till i look at the car.