Shift Point Road Test

This test verifies that the shift control system is operating correctly.

1. Bring engine and transmission up to normal operating temperature.
2. Operate the vehicle with the selector lever in the D5 position.
3. Apply minimum throttle and observe the speeds at which upshift occurs and torque converter engages. Refer to SHIFT SPEEDS SPECIFICATIONS 4.0L  or SHIFT SPEEDS SPECIFICATIONS 4.6L .
4. Stop the vehicle. Select the D4 position. Repeat Step  3. The transmission will make all upshifts except 4-5 and torque converter clutch should apply above 46 km/h (27 mph).
5. Press the accelerator pedal to the floor, wide open throttle (WOT). The transmission should shift from 3rd to 2nd, or 3rd to 1st, depending on vehicle speed, and torque converter clutch should release.
6. With vehicle speed above 48 km/h (30 mph), move the transmission range selector lever from D4 position to 1st position and release the accelerator pedal. The transmission should immediately downshift to 3rd gear. When vehicle speed drops below 32 km/h (20 mph), the transmission should downshift into 1st gear.
7. If transmission fails to upshift/downshift or torque converter clutch does not apply/release, refer to DIAGNOSIS BY SYMPTOM  for possible causes.