Chart C-8A, 3T40 Torque Converter Clutch, 3.3L PFI A Body: Notes

Fig 1: Clutch C-8B, TCC Circuit Diagram (3.3L PFI - A Body)

Courtesy of GENERAL MOTORS CORP.

Voltage is supplied to TCC solenoid through brake switch and transmission 3rd gear apply switch. ECM engages TCC by grounding circuit No. 422 to energize the solenoid. TCC will engage when:

• Vehicle speed is above 33 MPH.
• Engine at normal operating temperature.
• Throttle position not changing, indicating a steady speed.
• Brake switch and transmission 3rd gear switch are closed.
  NOTE: Test numbers refer to test numbers in diagnostic chart.
  1. This test checks fuse and brake switch.
  2. This test checks ECM for proper operation.
  3. This test checks internal switches in transmission.