Part Throttle Detent Downshift

At vehicle speeds of 64 to 88 km/in (40-55 mph) in Fourth gear, quickly depress the accelerator to a half open position. Verify the following results:
^ The TCC releases.
^ The transmission downshifts to 3rd gear immediately.
^ The 1-2 Shift Solenoid valve turns OFF.
^ The 2-3 Shift Solenoid valve remains OFF.