Diagnostic Aids
WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
Monitor Scan tool while moving the related connectors and wiring harness. If a malfunction occurs, the scan tool data will change states from either ON to OFF or from OFF to ON. Move the gear selector slowly through each gear while monitoring the scan tool in order to help isolate the problem.
When DTC sets, PCM defaults to 4th gear until PCM receives a correct combination. Some selected gear positions may not be possible until malfunction is repaired.