Torque Converter Clutch: Testing and Inspection

The [1][2]Torque Converter Clutch is applied by fluid pressure which is controlled by a solenoid located inside the Automatic Transaxle assembly. The solenoid is energized by completing an electrical circuit through a combination of switches and sensors.
The [1][2]Torque Converter Clutch is applied by fluid pressure which is controlled by a solenoid located inside the Automatic Transaxle assembly. The solenoid is energized by completing an electrical circuit through a combination of switches and sensors.

Functional Check Procedure

1. Set up a Tech 1 or other scan tool to read engine RPM.
2. Drive the vehicle until proper transaxle operating temperature is reached.
3. Drive the vehicle at 80 to 88 km/h (50 to 55 mph) with light throttle (road load).
4. Maintaining throttle, lightly touch the brake pedal and check for release of the TCC and a slight increase in engine rpm.
5. Release the brake, slowly accelerate and check for a re-apply of the TCC and a slight decrease in engine rpm.

To properly diagnose the Torque Converter Clutch (TCC) system, perform all electrical testing first and then test the hydraulic system.

Notice: Use only high impedance type ohmmeters for electrical testing on the TCC circuit. If another type of ohmmeter is used, damage to the TCC solenoid may occur.

Notice: Do not bench test the TCC solenoid using an automotive type battery. Accidentally crossed wires will damage the internal diode located in the wiring harness.