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Power Steering Pressure Test

  1. Place a dial thermometer in the power steering fluid reservoir.
  2. Install the scan tool and monitor the power steering pressure switch (PSP_V) PID.
    3. NOTE: Do not hold the steering wheel against the stops for an extended amount of time. Damage to the power steering pump can occur.
  3. Start the engine. With the engine at idle, raise the power steering fluid temperature to 74-80°C (165-176°F) by rotating the steering wheel fully to the left and right several times.
  4. With the steering wheel in the straight-ahead position and the engine speed at idle, record the pressure reading.
    • If the pressure reading is not within specification, check the power steering lines/hoses for kinks and restrictions and repair as necessary. Refer to GENERAL SPECIFICATIONS .
    5. NOTE: Do not hold the steering wheel against the stops for an extended amount of time. Damage to the power steering pump can occur.
  5. Turn (or have an assistant turn) the steering wheel to the left and right stops. Record pressure readings at the stops.
    • The pressure reading at both stops should be nearly the same as the maximum pump relief pressure (1,300-1,480 psi).
    • If the pressure reaches the maximum pump relief pressure (1,300-1,480 psi) AT ONE STOP BUT NOT THE OTHER  , install a new steering gear. Refer to POWER STEERING article.
    • If the pressure does not reach the maximum pump relief pressure (1,300-1,480 psi) AT ALL  , install a new power steering pump. Refer to POWER STEERING article.
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