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Home >> Kia >> 2012 >> Optima SX >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 3) - 2.0L >> DTC P0552: Power Steering Pressure Sensor Switch Circuit Low Input >> Inspection/Repair >> Component Inspection

Component Inspection

  1. IG 'OFF'.
  2. Connect prove to signal terminal as below and select 'Oscilloscope' menu on GDS.

    Channel A (+): Signal terminal of P/S pressure sensor, (-): Ground.

  3. Engine start and check the signal with operation.
    Fig 1: Screen Display - Power Steering Halt Signal Waveform
    G07382723Courtesy of KIA MOTORS AMERICA, INC.

    INTERVAL (1) : The signal at the Power Steering halt

    INTERVAL (2) : The normal performance signal including Most of the range

    INTERVAL (3) : The signal at the maximum steering angle.

  4. Is waveform within specification?

    YES 

    • Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Check P/S pressure sensor for contamination, deterioration, or damage. Substitute with a known-good P/S pressure sensor and check for proper operation. If the problem is corrected, replace P/S pressure sensor and then go to "VERIFICATION OF VEHICLE REPAIR ".