Shift Point Road Test

5R44E and 5R55E

Shift Point Road Test

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

The Shift Point Road Test provides diagnostic information on transmission shift controls. 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 the (D) position.

3. Apply minimum throttle and observe the vehicle speed at which an 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. The transmission will make all upshifts except the 4-5 shift, 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). The 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. The 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.

Shift Speeds

NOTE: Shift speed ranges are approximate for all applications. For specific applications (engine, axle ratio and application), refer to the Automatic Transmission Specification booklet.