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Home >> Pontiac >> 2004 >> Aztek Base, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle, 4T65-E Diagnostics (Troubleshooting) >> Troubleshooting >> Torque Converter Diagnosis Procedure >> Notes

Torque Converter Diagnosis Procedure: Notes

IMPORTANT: Before replacing the torque converter, refer to Torque Converter Replacement Guide .

The torque converter clutch (TCC) is applied by fluid pressure, which is controlled by a PWM solenoid valve. This solenoid valve is located inside of the automatic transmission assembly. The solenoid valve is controlled through a combination of computer controlled switches and sensors.