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СИСТЕМА SFI, Diagnostic DTC:P0550, P0552, P0553

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Информация добавлена 08-08-2017

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DTC Code DTC Name
P0550 Power Steering Pressure Sensor Circuit Malfunction
P0552 Power Steering Pressure Sensor Circuit Low Input
P0553 Power Steering Pressure Sensor Circuit High Input
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DESCRIPTION

The power steering oil pressure switch is turned on when a power steering wheel load is generated by turning the steering wheel. The ECM regulates the engine idling speed according to the voltage output of the sensor.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0550 Power Steering Pressure Sensor Circuit Malfunction Power steering oil pressure switch voltage below 0.28 V, or higher than 4.9 V for 0.5 seconds while engine running (1 trip detection logic).

  • Open or short in power steering oil pressure switch circuit

  • Power steering oil pressure switch

  • ECM

 Comes on DTC stored
P0552 Power Steering Pressure Sensor Circuit Low Input Power steering oil pressure switch voltage below 0.28 V for 0.5 seconds while engine running (1 trip detection logic).

  • Open or short in power steering oil pressure switch circuit

  • Power steering oil pressure switch

  • ECM

 Comes on DTC stored
P0553 Power Steering Pressure Sensor Circuit High Input Power steering oil pressure switch voltage higher than 4.9 V for 0.5 seconds while engine running (1 trip detection logic).

  • Open or short in power steering oil pressure switch circuit

  • Power steering oil pressure switch

  • ECM

 Comes on DTC stored
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MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to regulate the engine idling speed. When the sensor output voltage deviates from the normal operating range, the ECM determines that there is a malfunction in the power steering oil pressure switch and stores a DTC.

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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Start the engine.

  7. Idle the engine for 5 seconds [A].

  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].

  9. Read the pending DTCs.

    Tip:

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  11. Input the DTC: P0550, P0552 or P0553.

  12. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

Table 1. *a Power Steering Oil Pressure Switch
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

  • If other DTCs relating to different systems that have terminal ETHW as the ground terminal are output simultaneously, terminal ETHW may have an open circuit.

  • malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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PROCEDURE


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    CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SWITCH)


    1. Disconnect the C23 power steering oil pressure switch connector.

    2. Disconnect the C28 and C29 ECM connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C23-2 (PSP) - C29-16 (PSP) Always Below 1 Ω
      C23-1 (VC) - C28-16 (VCV2) Always Below 1 Ω
      C23-3 (E2) - C29-8 (ETHW) Always Below 1 Ω
      C23-2 (PSP) or C29-16 (PSP) - Body ground Always 10 kΩ or higher
      C23-1 (VC) or C28-16 (VCV2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE POWER STEERING OIL PRESSURE SWITCH


    1. Replace the power steering oil pressure switch.

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      Result
      Proceed to
      NEXT

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    CONFIRM WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Start the engine.

    5. Idle the engine for 5 seconds.

    6. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.


      1. Powertrain > Engine and ECT > Trouble Codes


    7. Read the DTCs.

      Result
      Result Proceed to
      P0550, P0552 and/or P0553 is output A
      No DTC is output B