Hydraulic Pressure Testing

Disconnect pressure lines from steering gear case and vane pump. Attach pressure gauge with gauge side connected to vane pump.
CAUTION: Do not keep pressure gauge valve closed for more than 10 seconds during test. Fluid testing temperature should be 176°F (80°C).
Attach valve side of gauge to pressure line. Bleed air from system and check fluid level. With engine at idle, check fluid pressure reading with pressure gauge valve closed.
Correct pressure should be 882 psi (62 kg/cm² ) for 4WD Pickup & 4Runner and 1024 psi (72 kg/cm² ) for all other models.
Check pressure with steering wheel at lock position and pressure valve open. Pressure should be 882 psi (62 kg/cm² ) for 4WD Pickup, 4Runner and 1024 psi (72 kg/cm² ) for all other models.
Measure pressure with engine at idle and again at 3000 RPM. Pressure difference should be less than 71 psi (5 kg/cm² ). If more, check flow control valve.
With vehicle on flat surface, turn steering wheel to center position. With engine idling, measure steering turning force at steering wheel outer rim over a full rotation on both sides of center point.
Turning force should not exceed 8.8 lbs. (4.0 kg) on Cressida, 13.2 lbs. (6.0 kg) on Land Cruiser models, or 7.7 lbs. (3.5 kg) on Pickup and 4Runner models.