Torque Converter Clutch Does Not Engage

Torque converter clutch does not engage

Diagnostic Procedure:

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

Also check for:

- Check for a stored DTC, and check for loose connectors.
- Inspect shift solenoid valve E for seizure, and the O-rings for wear and damage.
- Inspect A/T clutch pressure control solenoid valve A 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.