Excessive Shock or Flares On 1-2 Upshift or 2-1 Downshift

Excessive shock or flares on 1-2 upshift or 2-1 downshift

Diagnostic Procedure:

1. Shift solenoid valve A defective

2. Shift solenoid valve B defective

3. Shift solenoid valve C defective

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

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

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

7. 2nd clutch transmission fluid pressure switch defective

8. CPC valve A defective

9. CPC valve B defective

10. CPC valve C defective

11. Shift valve C defective

12. Shift valve D defective

13. Foreign material in separator plate orifice

14. 2nd accumulator defective

15. 2nd clutch defective

Also check for:

- Check for a stored DTC, and check for loose connections.
- Inspect the shift solenoid valve function with the HDS.
- Check for a seized shift solenoid valve, and inspect the O-rings.
- Inspect the A/T clutch pressure control solenoid valve with the HDS.
- 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 transmission fluid pressure switch connector. If the orifice is clogged, remove it and clean the connector.
- 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 A in the main valve body for free movement, and check the valve spring for wear and damage.
- Check CPC valves B and C in the secondary valve body for free movement, and check the valve springs for wear and damage.
- Check shift valves C and D in the secondary valve body for free movement, and check the valve springs for wear and damage.
- Check the 2nd clutch pressure.
- Inspect the 2nd clutch 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 2nd accumulator piston, the O-ring, and the spring in the accumulator body for wear and damage.