Shift Point Road Test

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 vehicle with transmission range selector lever in (D) position.

3. Apply minimum throttle and observe speeds at which upshifi occurs and torque converter engages; refer to the 4R70W Shift Speeds chart in this section.

4. With the transmission in OVERDRIVE (fourth gear) press the transmission control switch. The transmission should downshifi to third gear. Release the accelerator pedal; engine braking should occur.

5. Press accelerator pedal to floor wide open throttle (WOT). Transmission should shifi from third to second gear or third to first depending on vehicle speed. Torque converter clutch 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 downshifi into second gear. With vehicle remaining in manual 2 position move the transmission range selector lever into manual 1 position and release accelerator pedal. Transmission should downshifi into first gear at speeds approximately below 45-56 km/h (28-35 mph).

7. If transmission fails to upshifi/downshifi or torque converter clutch does not apply and release refer to Diagnosis By Symptom.