Shift Point Road Tests

NOTE: Always drive the vehicle in a safe manner according to the driving conditions and obey all traffic laws.

The Shift Point Road Test and Torque Converter Operation Tests provide diagnostic information on transmission shift controls and torque converter operation.

Shift Point Road Test

4R70W Shift Speeds:

This test verifies that the shift control system is operating properly.
1. Bring engine and transmission up to normal operating temperature.
2. Operate vehicle with transmission range selector lever in 0 position.

NOTE: Shift speed ranges are approximate for all applications.

3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages.
4. With transmission in Overdrive (fourth gear), press the transmission control switch. The transmission should downshift to third gear. Release the accelerator pedal; engine braking should occur.
5. Press accelerator pedal to floor Wide Open Throttle (WOT). The transmission should shift 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 the Overdrive position and speed above 80 km/h (50 mph) and less than half throttle, move the transmission range selector lever from OD position to manual 2. position and remove pressure from the release the accelerator pedal. the transmission should immediately downshift into second gear. With the transmission remaining in manual 2. position, move the transmission range selector lever into manual 1 position, and release accelerator pedal. Transmission should downshift into first gear at speeds below 48-56 km/h (30-35 mph).
7. If the transmission fails to upshift/downshift or the torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index.Symptom Related Diagnostic Procedures