Check for a stored DTC, and check for loose connectors.

Check the transmission fluid (HCF-2) level.

Check the transmission fluid (HCF-2) condition. If necessary, replace the transmission fluid (HCF-2).

Check the transmission fluid strainer and the transmission fluid filter for debris. If the transmission fluid strainer or the transmission fluid filter is clogged, find the damaged components that caused debris.

Check the transmission fluid feed pipe for wear, damage, and out of round.

Inspect the clearance between the forward clutch end-plate and the top disc. If the clearance is out of tolerance, replace the forward clutch assembly.

Inspect the reverse brake piston and the O-rings. Check the spring retainer for wear and damage. Inspect the clearance between the brake end-plate and the top disc. If the clearance is out of tolerance, inspect the brake discs and plates for wear and damage. If the discs and plates are worn or damaged, replace them as a set. If they are OK, adjust the clearance with the brake end-plate.

Check the main valve body for wear and damage.

Check the secondary valve body for wear and damage.

Check the linear solenoid valve body for wear and damage.

Check the clutch reducing valve body for wear and damage.