Silhouette V6-191 3.1L VIN D TBI (1995)
Torque Converter Clutch Solenoid: Testing and Inspection
RESULTS OF INCORRECT OPERATION
If the Torque Converter Clutch (TCC) does not apply, fuel economy may be lower than expected. If the vehicle speed sensor fails, the TCC will
not apply. If the 3rd gear switch (3T40 only) does not operate, the TCC will either not apply at the right time or not apply at all.
The TCC system has different operating characteristics than an automatic transaxle without TCC. If the driver complains of a "chuggle" or "surge"
condition, the vehicle should be road tested and compared to a similar vehicle to see if a real problem exists. Another TCC complaint may be a
downshift felt when going up a grade, especially with cruise control. This may be clutch disengagement rather than a downshift, due to the change
in throttle position to maintain cruising speed. The owner's manual section on TCC operation should be reviewed with the driver.
The diagnosis of the TCC system is covered in C Charts/Chart C-8 Torque Converter Clutch (TCC) Diagnosis for the 3T40. This C Chart
also contains diagnostic aids for using a Tech 1 scan tool for diagnosing the TCC circuit. Refer to C Charts / Chart C-8. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
