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cip0550


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                                                                                                                              DI-1 11
                                                  DIAGNOSTICS      -   ENGINE
                                                                                                                               DI68R-07




    DTC               P0550                Power Steering Pressure Sensor Circuit
                                           Malfunction

CIRCUIT DESCRIPTION
ECM controls the idle speed the most appropriate according to the signal from the power steering pressure
sensor.
  DTC No.                       DTC Detecting Condition                                              Trouble Area
            Condition (a) or (b) continues with more than 0.5 secs.:       S Open in power steering pressure sensor circuit
   P0550    (a) PNP < 0.28 V                                               S Power steering oil pressure sensor
            (b) PNP > 4.9 V                                                S ECM




WIRING DIAGRAM



      P2
      Power Steering Oil Pressure Sensor                                                                    ECM


                                                                3                              1
                                  3        R-W                           R-W                           VC
                           VC                                  EC1                             E6



                                              Y                 2          Y                    12
                                  2
                        VOUT                                   EC1                              E6     PSP


                                                                1                               9
                                  1         BR                            BR
                         GND                                   EC1                             E6      E2




                                                                                                                                 I05144




2002 ECHO (RM884U)

                                                                               Author :                  Date :                281
DI-1 12
                                      DIAGNOSTICS     -   ENGINE

INSPECTION PROCEDURE

   1        Check power steering oil pressure sensor.

                                           PREPARATION:
                                           (a) Connect the 3 dry batteries of 1.5 V in series.
                                           (b) Connect the wire harness as shown in the illustration.
                                           CHECK:
                                           Measure voltage between terminals Vout and GND.
          (-)
                                           OK:
                              180 k
                                                Power steering fluid pressure             Voltage (V)
          (+)
                                                    0 kPa (0   kgf/cm2,   0 psi)         Approx. 0.45
                                  A09071
                                              3,500 kPa (36     kgf/cm2,   512 psi)      Approx. 2.25
                                              7,000 kPa (71 kgf/cm2, 1,010 psi)          Approx. 4.05


                                             NG           Replace power steering oil pressure sensor.


   OK



   2        Check for open in harness and connector between ECM and power steering oil
            pressure sensor (See page IN-29 ).


                                             NG           Repair or replace harness or connector.


   OK



  Check and replace ECM(See page IN-29 ).




 2002 ECHO (RM884U)

                                                                     Author :         Date :            282



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