Lock-Up Does Not Engage

1. Faulty lockup relay valve.
2. Fault in No. 1 vehicle speed sensor circuit.
3. Fault in No. 2 vehicle speed sensor circuit.
4. Fault in shift solenoid valve SL circuit.
5. Fault in throttle position sensor circuit.
6. Fault in [1][2]park/neutral position switch circuit.
7. Faulty ECM.
8. Fault in stop lamp switch circuit.
9. Fault in engine coolant temperature sensor circuit.