Shift Point Road Test
Road Testing VehicleThe following Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transmission shift controls and torque converter operation.
Shift Point Road Test
NOTE: Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws. 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 transmission range selector lever in (D) range.
3. Apply minimum throttle and observe the speeds at which the upshift occurs and the torque converter engages. (Refer to the shift speed chart.)
4. Press the accelerator pedal to the floor (wide-open throttle). The transmission should shift from fifth to fourth gear or fifth to third, depending on vehicle speed. Torque converter clutch should disengage and then reapply.
5. With the vehicle speed above 48 km/h (30 mph), move the transmission range selector lever to a position that provides manual third gear. The transmission should immediately have a fourth to third shift. When the vehicle speed drops to 32 km/h (20 mph) a three to one shift should occur.
6. If transmission fails to upshift/downshift or if the torque converter clutch does not apply and release, refer to Diagnosis By Symptom Diagnosis By Symptom Index
Shift Speeds
Shift Speeds
NOTE: All shift speeds are for D position (O/D not cancelled on diesel models and Tow/Haul not activated on gasoline models).
NOTE: All shift speeds listed are nominal and vary with calibration, model, axle ratio and tire size.