Hydraulic Pressure Testing
- Disconnect pressure lines from steering gear case and vane pump. Attach pressure gauge with gauge side connected to vane pump.
- 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 782 psi (55 kg/cm2
) for Tercel, 1024 psi (72 kg/cm2
) for Celica and 1066 psi (75 kg/cm2
) for all other models.NOTE: Do not keep pressure gauge valve closed for more than 10 seconds. Fluid testing temperature should be 176°F (80°C).
- Check pressure with steering wheel at lock position and pressure valve open. Pressure should be 782 psi (55 kg/cm2 ) for Tercel, 1024 psi (72 kg/cm2 ) for Celica and 1066 psi (75 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, in both directions.
- Turning force should not exceed 12.0 lbs. (5.5 kg) on Corolla and Tercel, or 8.8 lbs. (4.0 kg) on all other models.