GM Service Manual Online
For 1990-2009 cars only

The road test is to diagnose the failure symptom accurately and check the failure symptom after procedure.

Specification
The oil temperature before the road test is 50-80°C (122-176°F).

  1. Drive (D) range test
  2. • Check for up-shift, down-shift, kick-down and lock-up operation at the shift point shown in the shift schedule.
    • Check for engine brake operation.
    • Check for abnormal shock, noise, and harshness.
  3. Park (P) range test
  4. Park the vehicle on a gradient, more than 5 degrees, shift into the park (P) range and release the parking brake. Make sure the vehicle is not moving by operations of the parking lock pawl.