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Torque converter clutch does not engage

Probable cause(s)
  1. Shift solenoid valve D defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Input shaft (mainshaft) speed sensor defective
  4. Output shaft (countershaft) speed sensor defective
  5. Torque converter clutch piston defective
  6. Torque converter check valve defective
  7. Lock-up shift valve defective
  8. 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.
  • Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.
  • Inspect the sensor O-ring for wear and damage.
  • 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.