Vehicle Moves In D and R, But Not In 1ST In S

Vehicle moves in D and R, but not in 1st in S

Diagnostic Procedure:

1. 1st-hold accumulator defective

2. 1st-hold clutch defective

Also check for:

- Check the 1st-hold clutch pressure.
- Inspect the secondary shaft and 1st/1st-hold clutch assembly for wear and damage.
- Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and the plates for wear and damage, and inspect the clutch wave-plate height. If the discs and the flat-plates are worn or damaged, replace the discs and the flat-plates as a set. If the wave-plate height is out of tolerance, replace the wave-plate. If the discs and the plates are OK, adjust the clearance with the clutch end-plate.