Shift Point Road Test

5R44E and 5R55E

Shift Point Road Test

This test verifies that the shift control system is operating correctly.

1. Bring the engine and transmission up to normal operating temperature.

2. Operate the vehicle with the selector lever in (D) position.

3. Apply minimum throttle and observe the speeds at which upshift occurs and the torque converter engages. Refer to the following Shift Speeds chart. Also refer to the Automatic Transmission Specifications.

4. Stop the vehicle. Press the Transmission Control (TC) switch to activate drive range Overdrive (O/D) OFF. Repeat Step 3. Transmission will make all upshifts except 4-5, and the Torque Converter Clutch (TCC) apply should occur above 46 km/h (29 mph).

5. Press the accelerator pedal to the floor, Wide Open Throttle (WOT). Transmission should shift from 4th to 3rd, 3rd to 2nd, or 3rd to 1st, depending on the vehicle speed, and the TCC should release.

6. With vehicle speed above 48 km/h (30 mph), move the selector lever from (D) to 1 (LOW) and release the accelerator pedal. Transmission should immediately downshift to 3rd gear. When the vehicle speed drops below 32 km/h (20 mph), the transmission should downshift into 1st gear.

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