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SFI SYSTEM, Diagnostic DTC:P0505

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DTC Code DTC Name
P0505 Idle Control System Malfunction
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DESCRIPTION

The idle speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) one valve type throttle body assembly; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position sensor, which detects the accelerator pedal position; and 5) the ECM, which controls the electronic throttle control system. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

DTC No. DTC Detection Condition Trouble Area
P0505 Idle speed continues to vary greatly from target speed (2 trip detection logic)

  • Electronic throttle control system

  • Intake system

  • PCV hose connections

  • ECM
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INSPECTION PROCEDURE

Tip:

  • The following conditions may also cause DTC P0505 to be set:


    1. The floor carpet overlapping onto the accelerator pedal, causing the accelerator pedal to be slightly depressed and therefore the throttle valve position to be slightly open.

    2. The accelerator pedal being not fully released.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

  • Refer to " Data List / Active Test" [Engine Speed, ISC Feedback Value and ISC Learning Value] (Click here).

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PROCEDURE


  1. Click here

    CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0505 is output A
      DTC P0505 and other DTCs are output B
      Tip:

      If any DTCs other than P0505 are output, troubleshoot those DTCs first.


  2. Click here

    CHECK PCV HOSE (HOSE CONNECTIONS)


    1. Check the PCV hose connections (Click here).

      OK
      PCV hose is connected correctly and is not damaged.

  3. Click here

    CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks (Click here).

      OK
      No leaks in the intake system.

  4. Click here

    INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)


    1. Check for contamination between the throttle valve and the housing. Also check that the throttle valve moves smoothly.

      OK
      Throttle valve is not contaminated with foreign objects and moves smoothly.

  5. Click here

    CONFIRM WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs (Click here).

    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accelerations switched off.

    6. Idle the engine for 1 minute or more.

      Tip:

      In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

    7. Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more (A).

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    8. Repeat step (A) 5 times.

    9. Enter the following menus: Powertrain / Engine / DTC.

    10. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0505 is output A
      DTC is not output B

  6. Click here

    GO TO DTC CHARTClick here

  7. Click here

    REPAIR OR REPLACE PCV HOSE

  8. Click here

    REPAIR OR REPLACE INTAKE SYSTEM

  9. Click here

    REPLACE THROTTLE BODY ASSEMBLYClick here

  10. Click here

    REPLACE ECMClick here

  11. Click here

    END