Excessive Shock or Flares on 4-5 Upshift or 5-4 Downshift

Excessive shock or flares on 4-5 upshift or 5-4 downshift

Diagnostic Procedure:

1. A/T clutch pressure control solenoid valve A defective

2. A/T clutch pressure control solenoid valve B defective

3. A/T clutch pressure control solenoid valve C defective

4. Foreign material in separator plate orifice

5. 4th accumulator defective

6. 5th accumulator defective

7. 4th clutch defective

8. 5th clutch defective

9. Clearance between clutch end-plate and top disc incorrect

Also check for:

- Check for a stored DTC, and check for loose connections.
- Test the A/T clutch pressure control solenoid valve A or B with the HDS. A/T Clutch Pressure Control Solenoid Valve A and B Test
- Check the stall speed in R. A/T Stall Speed Test
- Check the 4th and 5th clutch pressures. A/T Pressure Test
- Inspect the A/T clutch pressure control solenoid valve C with the HDS. A/T Clutch Pressure Control Solenoid Valve C Test
- Inspect the A/T clutch pressure control solenoid valve body gasket, the ATF feed pipes, and the O-rings for wear and damage.
- Check for a clogged orifice in the separator plate. If the orifice is clogged, remove it and clean the separator plate orifice.
- Inspect the 4th and 5th clutches 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 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.
- Check the 4th and 5th accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage.