GM Service Manual Online
For 1990-2009 cars only

The manual shifting test is to determine whether the failure symptom is within electrical failure or mechanical failure.

Important: Make sure to disconnect only wire harness of shift solenoid.

Disconnect the wire harness of the shift solenoid. Check the range and gear positions correspond with the following table when driving by manual shifting.

Range

Gear

D

3rd Gear

R

Reverse