Excessive Shock When Starting Off

Excessive shock when starting off

Diagnostic Procedure:

1. Forward clutch defective

2. Reverse brake defective

3. Reverse brake piston stuck, worn or damaged

4. Start clutch defective

5. Start clutch end-plate clearance incorrect

6. Start clutch feed pipe damaged or out of round

7. Low CVTF level

8. CVTF deteriorated

9. Valve body assembly defective

10. CVT driven pulley pressure control valve defective

11. CVT drive pulley pressure control valve defective

12. CVT start clutch pressure control valve defective

13. Solenoid harness worn or damaged

14. PCM defective

15. Start clutch control system memory in PCM defective

16. Engine output low

17. IMA motor defective

Also check for:

- Check the forward clutch pressure.
- 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 plates for wear and damage. If the discs and plates are worn or damaged, replace them as a set. If they are OK, adjust the clearance with the clutch end-plate.
- Check for a stored DTC, and check for a loose solenoid harness connector.
- Check the reverse brake pressure.
- Inspect the reverse brake piston and the O-rings. Check the spring retainer for wear and damage. Inspect the clearance between the reverse brake end-plate and the top disc. If the clearance is out of tolerance, inspect the reverse brake discs and plates for wear and damage. If the discs and plates are worn or damaged, replace them as a set. If they are OK, adjust the clearance with the reverse brake end-plate.
- Check the CVTF level, and check the ATF cooler lines for leakage and loose connections. If necessary, clean the ATF cooler lines.
- Calibrate the start clutch control system.