Converter Clutch Does Not Engage

1. Converter clutch solenoid not energized electrically.
2. Wires to solenoid shorted or circuit open.
3. Transmission case connector not seated.
4. Open or shorted circuit inside solenoid.
5. Malfunctioning engine coolant temperature sensor.
6. Malfunctioning throttle position sensor.
7. Malfunctioning manifold absolute pressure (MAP) sensor.
8. Vacuum line disconnected from MAP sensor.
9. Malfunctioning brake switch.
10. Malfunctioning EEC-IV processor.
11. Converter clutch shuttle valve stuck in the unlock position (against plug) or too high a spring load.
12. Torque converter internal malfunction.
13. Converter clutch solenoid is energized electrically but foreign matter on hydraulic part of solenoid valve prevents closure.