Upshift Control and Torque Converter Clutch (TCC)

With gear selector in Overdrive (D), perform the following steps:
1. Refer to Shift Speed and choose a throttle angle of either 10% or 25%.
2. Monitor TP ANGLE and VEHICLE SPEED with the scan tool.
3. Accelerate to the chosen throttle angle. Hold the throttle steady.

Important: Shift speeds may vary due to slight hydraulic delays in responding to electronic controls. A change from the original equipment tire size also affects shift speeds.

4. As the transmission upshifts, note the shift speed for each of the following gears:
- 2nd gear
- 3rd gear
- 4th gear
5. The Torque Converter Clutch (TCC) should not apply unless the transmission has reached a minimum TRANS FLUID temperature of 8° C (46° F) and ECT temperature of 50° C (122° F). Note when the TCC applies. This should occur in Fourth gear. If you do not notice the apply by an RPM drop, refer to TORQUE CONVERTER CLUTCH EVALUATION AND DIAGNOSIS.
6. Repeat steps 1-5 using several different throttle angles.