Excessive Shock or Flares on 3-4 Upshift or 4-3 Downshift

Excessive shock or flares on 3-4 upshift or 4-3 downshift

A/T clutch pressure control solenoid valve A defective

A/T clutch pressure control solenoid valve B defective

A/T clutch pressure control solenoid valve C defective

4th clutch transmission fluid pressure switch defective

Shift fork shaft stuck

Servo control valve defective

Foreign material in separator plate orifice

3rd accumulator defective

4th accumulator defective

3rd clutch defective

4th clutch defective

Clearance between clutch end-plate and top disc incorrect

Notes

Test the 4th clutch transmission fluid pressure switch operation with the HDS.

Notes

Test A/T clutch pressure control solenoid valve A or B with the HDS A/T Clutch Pressure Control Solenoid Valve A and B Test.

Notes

Test A/T clutch pressure control solenoid valve C with the HDS A/T Clutch Pressure Control Solenoid Valve C Test.

Notes

Check the 3rd and 4th clutch pressures A/T Pressure Test.

Notes

Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF pipes, the ATF joint pipe, and the O-rings for wear and damage.

Notes

Check for a missing shift fork bolt on the shift fork shaft.

Notes

Check the shift fork shaft detent for wear and damage.

Notes

Check for a stuck servo valve in the regulator valve body, and check the O-ring for wear and damage.

Notes

Check the servo control valve in the main valve body for free movement, and check the valve spring for wear and damage.

Notes

Check for a clogged orifice in the separator plate. If the orifice is clogged, remove it and clean the separator plate orifice.

Notes

Inspect the 3rd and 4th clutches for wear and damage.

Notes

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 plates are worn or damaged, replace them as a set. If the clutch wave-plate height is out of the tolerance, replace the clutch wave-plate. If they are OK, adjust the clearance with the clutch end-plate.

Notes

Check the 3rd and 4th accumulator pistons, the O-rings, and the springs in the regulator valve body, and the accumulator body for wear and damage.