Differential Clutch Pump Check Valve Cleaning and Inspection

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the inlet valve for the following:

Damaged, loose, or missing pick up screen (1)
Damaged or missing O-rings (2)
Damaged electrical connector (3)
Oil passages (4) restricted by dirt or debris

Fig 1: Inspecting Inlet Valve For Damage
Courtesy of GENERAL MOTORS CORP.