Functional Inspection 1
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Functional Inspection 1 is a mechanical system inspection for both the left and right side gerotor pumps, pistons and clutch packs and will assist in determining if:
- The clutch pump check valve is in the "open" position.
- The left and right side gerotor pumps have the ability to "pull" fluid from the sump and send pressurized fluid to the left and right side clutch pack pistons.
- The left and right side pistons will engage the specific side clutch packs.
- There is a mechanical connection between the rear differential ring and pinion, the propeller shaft, the transfer case and the transmission assembly.
- Raise the vehicle on a hoist. Lift the vehicle in a manner that will allow all four wheels to rotate during testing.
- Start the engine.
- Move the gear shift lever to the NEUTRAL position.
- Rotate, by hand, a rear wheel in a forward direction. If the All-Wheel Drive (AWD) system mechanical components are functioning properly, the front wheels will rotate at the same speed.
- Rotate, by hand, the opposite side rear wheel. If the All-Wheel Drive (AWD) system mechanical components are functioning properly, the front wheels will rotate at the same speed. Failure of the front wheels to rotate during this test may indicate a "closed" clutch pump check valve, malfunctioning gerotor pump, piston, clutch pack or valves internal to the unit.