Torque Converter Lock-Up Clutch (TCC) Diagnosis: Notes
WARNING: This page is about a different car, the 2005 Suzuki Reno and 2005 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.
To properly diagnosis the lock-up clutch (TCC) system, perform all electrical testing first and then the hydraulic testing.
The TCC is applied by fluid pressure which is controlled by a solenoid Located inside the valve body. The solenoid is energized by completing an electrical circuit through a combination of switches and sensors.