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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 idling speed is controlled by the electronic throttle control system. The electronic throttle control system is comprised of: 1) the one valve type throttle body; 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 idling speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

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

  • Electronic throttle control system

  • Air induction system

  • PCV hose connection

  • ECM
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INSPECTION PROCEDURE

Tip:

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


    1. The floor carpet overlapping slightly 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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

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PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Select the following menu items: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Display (DTC Output) Proceed to
      P0505 A
      P0505 and other DTCs B
      Tip:

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


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    CHECK PCV HOSE CONNECTIONS

    OK
    PCV hose is connected correctly and is not damaged.

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    CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leakage.

      OK
      No leakage from air induction system.

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    CHECK THROTTLE VALVE


    1. Check the throttle valve condition.

      OK
      Normal

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    REPLACE ECMClick here

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    GO TO DTC CHARTClick here

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    REPAIR OR REPLACE PCV HOSE

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    REPAIR OR REPLACE AIR INDUCTION SYSTEM

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    REPLACE THROTTLE BODYClick here