Torque Converter Clutch Does Not Engage

Torque converter clutch does not engage

Diagnostic Procedure:

1. Shift solenoid valve D defective

2. A/T clutch pressure control solenoid valve C 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 the O-rings, and check for a seized shift solenoid valve.
- Inspect the A/T clutch pressure control solenoid valve C body gasket for wear and damage. If the A/T clutch pressure control solenoid valve C is stuck, inspect the CPC valves.
- Inspect the sensor O-rings.
- Replace the torque converter.