Upshift Control and Torque Converter Clutch

With the gear selector in Overdrive (D), perform the following steps:

1. Refer to Shift Speed and choose a throttle position of either 10% or 25%. Specifications
2. Monitor the throttle angle and the vehicle speed with the scan tool.

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.

3. Accelerate to the chosen throttle angle. Hold the throttle steady.
4. As the transmission upshifts, note the shift speed and the commanded gear changes for each of the following gears:
- 2nd gear
- 3rd gear
- 4th gear

Important: The TCC should not apply unless the transmission has reached a minimum operating temperature of 8°C (46°F) Trans Temp and 50°C (122°F) Engine Coolant Temp.

5. The Torque Converter Clutch (TCC) should apply in Fourth gear. Note when the TCC applies. If you do not notice the apply by an RPM drop, refer to Torque Converter Clutch Diagnosis.
6. Repeat steps 1-5 using several different throttle angles.