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. Shift solenoid valve C defective

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

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

4. CPC valve B defective

5. CPC valve C defective

6. Foreign material in separator plate orifice

7. Shift valve C defective

8. Shift valve E defective

9. Kick-down valve or kick-down short valve defective

10. 4th accumulator defective

11. 5th accumulator defective

12. 4th clutch defective

13. 5th clutch defective

Also check for:

- Check for a stored DTC, and check for loose connectors.
- Inspect the O-rings, and check for a seized shift solenoid valve.
- Inspect the A/T clutch pressure control solenoid valve body gasket and ATF feed pipes for wear and damage. If the A/T clutch pressure control solenoid valve is stuck, inspect the CPC valves.
- Check the 4th and 5th clutch pressures.
- 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.