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Diagnosing GM Converter Lock-Up Problems Part 1



Understanding and diagnosing the Torque Converter Clutch and Torque Converter Clutch Solenoid. One of the most common type of General Motors transmission problem.
More...
» Part 1: The Problem...
» Part 2: The TCC
» Part 3: The TCC Solenoid
» Part 4: Test 1
» Part 5: Test 2 & 3
» Part 6: Test 4 & 5
» Part 7: Test 6
» Part 8: Test 7
» Part 9: Test 8 & 9
» Part 10: Test 10
» Part 11: Test 11 & 12
» Part 12: Test 13
 

A common problem on many General Motors cars is the Torque Converter Clutch fails to release and causes the car to stall when it comes to a stop. Most of the time it is a stuck Torque Converter Clutch (TCC) solenoid, but this is not the only cause of this problem. General Motors has issued a few Technical Service Bulletins (TSBs) relating to this problem. There is also a specific diagnostic procedure to determine the exact cause of the TCC problem.

Before I get into the diagnostic procedure, let's talk about the components, what they are and what they do.

The Torque Converter:

By definition: "The torque converter converts hydraulic pressure within the transmission to mechanical torque, which drives the drive shafts and ultimately, the wheels."

When the car is in low, second and reverse gears the converter operates in hydraulic or soft drive. In hydraulic drive, the converter functions as an automatic clutch that keeps the car from stalling when at a stop.

The power flow:

  • The engine drives the impeller mechanically.
  • The impeller drives the turbine hydraulically.
  • The turbine drives the tube input shaft for input to the gear train.

The impeller puts the transmission fluid in motion. Inside the impeller housing are many curved vanes, along with an inner ring that form passages for the fluid to flow through. The rotating impeller acts as a centrifugal pump. Fluid is supplied by the hydraulic control system and flows into the passages between the vanes. When the impeller turns, the vanes accelerate the fluid and centrifugal force pushes the fluid outward so that it is discharged from openings around the inner ring. The curvature of the impeller vanes directs the fluid toward the turbine, and in the same direction as impeller rotation.

More...
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Part 1       » Part 2       » Part 3       » Part 4
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Part 5       » Part 6       » Part 7       » Part 8
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Part 9       » Part 10     » Part 11      » Part 12
Additional Information provided courtesy of
ALLDATAdiy.com and Warranty Direct
© 2000-2007 Vincent T. Ciulla

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