Shift Point Road Tests

NOTE: Always drive the vehicle in a safe manner according to 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 Chart:

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 (OD) position.
3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages. Refer to the 4R70W Shift Speeds chart.

NOTE: Shift speed ranges are approximate for all applications.

4. With vehicle in Overdrive (fourth gear), press transmission control switch. Transmission should downshift to third gear. Remove foot from accelerator pedal; engine braking should occur.
5. Press accelerator pedal to floor (WOT). 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 vehicle 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 foot from accelerator pedal. Transmission should immediately downshift into second gear. With vehicle remaining in manual 2 position, move the shift control 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 transmission falls to upshift/downshift or torque converter clutch does not apply and release, refer to Diagnosis by Symptom Index. 4R70W