Chart C-8A, Torque Converter Clutch Electrical Diagnosis - 3.8L PFI (VIN L) W Body: Notes

Fig 1: Chart C-8A, TCC Circuit Diagram (3.8L PFI VIN L) W Body)

Courtesy of GENERAL MOTORS CORP.

Each gear switch opens when appropriate clutch is applied. All gear switches are open in 4th gear. TCC will engage when:

• Vehicle speed is above 40 MPH.
• Engine is at normal operating temperature.
• Throttle position not changing, indicating a steady speed.
• Brake switch closed.
• 3rd and 4th gear switch open.
  NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. This test checks TCC solenoid for open.
  2. This test checks fuse, brake switch and circuits No. 39 and 420 to TCC solenoid.