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Torque converter clutch does not operate smoothly

Probable cause(s)
  1. Shift solenoid valve D defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Torque converter clutch piston defective
  4. Torque converter check valve defective
  5. Lock-up shift valve defective
  6. Lock-up control valve defective
Notes
  • 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, ATF feed pipes, and O-rings for wear and damage.
  • Inspect the O-rings, and check the shift solenoid valve for seizure.
  • Replace the torque converter assembly.
  • Check the torque converter check valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
  • Check the lock-up shift valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
  • Check the lock-up control valve in the main valve body for free movement, and check the valve spring for wear and damage.