Torque converter clutch does not engage
Probable Cause(s)
  1. Shift solenoid valve E 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 connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Replace the torque converter.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.