Non-Trouble Code Procedures
Shift Point Road TestThis 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 D6 position.
3. Apply minimum throttle and observe speeds at which upshift occurs and torque converter engages. Refer to the Shift Speeds chart.
4. With the transmission in D6, move the range selector lever into the D4 position. The transmission should downshift to fourth gear. Release the accelerator pedal; engine braking should occur.
5. Press the accelerator pedal to floor, Wide Open Throttle (WOT). Transmission should shift from fourth to third, depending on vehicle speed. The torque converter clutch should disengage and then reapply.
6. With the transmission in D6 position and speed above 80 Km/h (50 mph) and less than half throttle, move the transmission range selector lever from D6 position to manual 2 position and remove pressure from the accelerator pedal. The transmission should downshift into second gear. With the vehicle remaining in manual 2 position, move the transmission range selector lever into manual 1 position and release the accelerator pedal. The transmission should downshift into first gear at speeds below approximately 45 - 56 Km/h (28 - 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. 6HP26 Automatic Transmission
Shift Speeds
NOTE: Shift speed ranges are approximate for all applications. For specific applications (engine, axle ratio, tire size and application), refer to the Automatic Transmission Specifications. Specifications Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.