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Hydraulic Pressure Testing

  1. Disconnect pressure lines from steering gear case and vane pump. Attach Pressure Gauge (09631-22020 ) with gauge side connected to 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).
  2. 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. Pressure for 4WD Pickup is 924 psi (65 kg/cm2 ). For all others, pressure is 1067 psi (75 kg/cm2 ).
  3. Check pressure with steering wheel at lock position and pressure valve open. Pressure for 4WD Pickup is 924 psi (65 kg/cm2 ). For all others, pressure is 1067 psi (75 kg/cm2 ).
  4. 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.
  5. With engine idling, measure steering wheel turning force at steering wheel outer rim over a full rotation on both sides of center point. Turning force should not exceed 106 INCH lbs. (12 N.m).
  6. On models with electronically-controlled power-assist, disconnect solenoid harness connector from harness. Apply battery voltage to solenoid.
    CAUTION: Do not apply battery voltage to solenoid for more than 30 seconds. Solenoid will be damaged.
  7. Measure turning force at steering wheel outer rim over a full rotation on both sides of center. Turning force should not exceed 26 lbs. (35 N.m).
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