Checking oil pressure while the gearbox is running (Sierra)

1. Connect an oil pressure gauge with a female threaded end of the appropriate diameter to the gearbox housing.

2. Place the pressure gauge in the car so that its readings are visible from the driver's seat.

3. Heat (while the vehicle is moving) the oil in the gearbox to normal operating temperature.

4. Check the gearbox oil pressure while the engine is idling.

5. If the pressure is too low, you should check the oil level, hydrokinetic transmission, and also the oil pump.

6. If the pressure is too high, the following should be checked: engine idle speed, vacuum line between engine and gearbox drive, vacuum regulator, hydraulic control unit in gearbox, and oil pressure during engine overload test (see subsection 6.3.6).

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