No Torque Converter Clutch Apply

1. Electrical problem.
a. 12 volts not being supplied to clutch solenoid.
b. Defective solenoid.
c. Damaged electrical connector.
d. Defective pressure switch.
e. Wire grounded.
2. Converter clutch shift valve or throttle valve stuck.
3. Pump Assembly.
a. Plugged converter signal oil orifice in pump.
b. Damaged or missing solenoid O-ring.
c. Orifice cup plug missing in oil cooler passage in pump.
d. Damaged or improperly positioned pump to case gasket.
e. Converter clutch application valve stuck.
f. Cup plug missing from application passage.