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 the selector lever in (D) position.

3. Apply minimum throttle and observe speeds at which upshift occurs and the torque converter engages. Refer to the Shift Speeds chart.

4. With the transmission in (D), move the selector lever into the manual 3 position. The transmission should downshift to 4th gear. Release the accelerator pedal; engine braking should occur.

5. Press the accelerator pedal to floor, Wide Open Throttle (WOT). Transmission should shift from 4th to 3rd, depending on vehicle speed. The Torque Converter Clutch (TCC) 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 selector lever from (D) position to manual 2 position and release the accelerator pedal. The transmission should downshift into 2nd gear. With the transmission remaining in the manual 2 position, move the selector lever into the manual 1 position and release the accelerator pedal. The transmission should downshift into 1st gear at speeds below approximately 45-56 km/h (28-35 mph).

7. If the transmission fails to upshift/downshift or the TCC does not apply and release, refer to Diagnosis By Symptom Diagnosis By Symptom.

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









Road Test - Adaptive Drive Cycle

1. Connect the scan tool to the Data Link Connector (DLC).

2. NOTE: Disconnecting the battery will not clear the Keep Alive Memory (KAM).

NOTE: Do not clear the PCM KAM.

Using the scan tool, clear the Transmission Control Module (TCM) KAM and the adaptive table before conducting an adaptive drive cycle test.

3. Using the scan tool verify that the transmission fluid is at normal operating temperature, between 80°C-82°C (176°F-180°F). If the transmission fluid is not at operating temperature, drive the vehicle approximately 5 km (3.1 mi) to reach operating temperature.

4. NOTE: The transmission fluid must be at operating temperature before proceeding to this step.

Drive the vehicle to perform adaptive shift strategy learn on a level road surface.

1. Accelerate from a stop with light throttle to 24 km/h (15 mph) and then release the accelerator pedal.

2. Gently brake and bring the vehicle to a stop and hold foot on the brake for 6 seconds.

3. Repeat Substeps 1 and 2 an additional 5 times.

4. Accelerate from a stop with light throttle so that the 1-2, 2-3 and 3-4 shifts occur with engine speeds between 1,700-2,000 rpm.

5. Continue accelerating until either the vehicle speed reaches 80 km/h (50 mph) or the 5-6 upshift is reached.

6. Gently brake and bring the vehicle to a stop and hold foot on the brake for 10 seconds.

7. Repeat Substeps 4, 5 and 6 an additional 3 times.