Excessive Shock or Flares on 2-3 Upshift or 3-2 Downshift

Excessive shock or flares on 2-3 upshift or 3-2 downshift

Diagnostic Procedure:

1. Shift solenoid valve D defective

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

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

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

5. 3rd clutch transmission fluid pressure switch defective

6. Shift fork shaft stuck

7. Servo control valve defective

8. CPC valve A defective

9. CPC valve B defective

10. Lock-up shift valve defective

11. Foreign material in separator plate orifice

12. 2nd accumulator defective

13. 3rd accumulator defective

14. 2nd check ball stuck

15. 2nd clutch defective

16. 3rd clutch defective

17. Clearance between the clutch end-plate and the top disc is incorrect

Also check for:

- Check for a stored DTC, and check for loose connections.
- Inspect shift solenoid valve function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- Inspect A/T clutch pressure control solenoid valve with the HDS.
- Inspect A/T clutch pressure control solenoid valve body gasket, ATF feed pipes, and O-rings for wear and damage.
- Check for a clogged orifice in the transmission fluid pressure switch connector. If the orifice is clogged, remove it and clean the connector.
- Check for a missing shift fork bolt on the shift fork shaft.
- Check the shift fork shaft detent for wear and damage.
- Check for a stuck servo valve in the regulator valve body, and check the O-ring for wear and damage.
- Check the servo control valve, CPC valve A, and lock-up shift valve in the main valve body for free movement, and check the valve springs 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.
- Check CPC valve B in the secondary valve body for free movement, and check the valve spring for wear and damage.
- Check the 2nd and 3rd clutch pressures.
- Inspect the 2nd and 3rd clutches for wear and damage.
- Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer for wear, damage, and peeling. 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 wave-plate height is out of the tolerance, replace the wave-plate. If they are OK, adjust the clearance with the clutch end-plate.
- Check the 2nd and 3rd accumulator pistons, the O-rings, and the springs in the accumulator body for wear and damage.
- Check for a stuck 2nd check ball in the secondary valve body.