Shift Point Road Test

4R70E/4R75E

Shift Point Road Test

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

1. Bring the engine and transmission up to normal operating temperature.

2. Operate vehicle with the selector lever in the (D) position.

3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages; refer to the Shift Speed Chart.

4. With the transmission in (D) (4th gear), press the Transmission Control Switch (TCS). The transmission should downshift to 3rd gear. Release the accelerator pedal; engine braking should occur.

5. Press accelerator pedal to floor, Wide Open Throttle (WOT). Transmission should shift from 3rd to 2nd gear, or 3rd to 1st, depending on vehicle speed. Torque Converter Clutch (TCC) should disengage and then reapply.

6. With the transmission in (D) position and speed above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from (D) position to manual 2 position and remove pressure from the accelerator pedal. Transmission should immediately downshift into 2nd gear. With vehicle remaining in manual 2 position, move the transmission range selector lever into manual 1 position and release accelerator pedal. Transmission should downshift into 1st gear at speeds approximately below 45-56 km/h (28-35 mph).

7. If transmission fails to upshift/downshift or TCC does not apply and release, refer to Diagnosis By Symptom Diagnosis By Symptom.

Shift Speed Chart: