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 the D indicator, and check for loose connectors. Inspect the solenoid valve filter/gasket for wear and damage, and inspect the solenoid valves for seizure.
- Replace the torque converter.
- Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.