Late Shift After Shifting From N To D, Or Excessive Shock When Shifted Into D (A/T)

Late shift after shifting from N to D, or excessive shock when shifted into D

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. Shift cable broken or out of adjustment

5. Connection between shift cable and transmission or body is worn

6. Input shaft (mainshaft) speed sensor defective

7. Output shaft (countershaft) speed sensor defective

8. ATF temperature sensor defective

9. Foreign material in separator plate orifice

10. Servo control valve defective

11. 1st accumulator defective

12. 1st check ball stuck

13. Lock-up shift valve defective

14. 1st clutch defective

Also check for:

- Check for a stored DTC, and check for loose connections.
- Test the solenoid valve function 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 loose shift cable at the shift lever and the selector control lever.
- Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation. Inspect the sensor O-ring 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 the ATF strainer for debris. If the strainer is clogged with particles of steel or aluminum, inspect the ATF pump. If the ATF pump is OK, find the damaged components that caused the debris. If no cause for contamination is found, replace the torque converter.
- Check the servo control valve in the main valve body.
- Inspect the 1st accumulator piston, the O-ring, and the spring for wear and damage in the regulator valve body.
- Check that the 1st check ball is not stuck in the main valve body.
- Check the lock-up shift valve in the regulator valve body.
- Check the 1st clutch pressure.
- Inspect the secondary shaft and the 1st 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 wave-plate height is out of tolerance, replace the wave-plate. If they are OK, adjust the clearance with the clutch end-plate.