SFI SYSTEM, Diagnostic DTC:P0505

DTC Code DTC Name
P0505 Idle Control System Malfunction

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

Idle speed continues to vary greatly from target speed

(2 trip detection logic)

  • Electronic throttle control system

  • Intake system

  • PCV hose connection

  • ECM

INSPECTION PROCEDURE

Tech Tips


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


    1. The throttle valve is not fully closed. (e.g. The accelerator pedal is slightly depressed by something such as a floor carpet overlapping the accelerator pedal.)

  • 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.

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Read the DTCs.

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

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. CHECK PCV HOSE CONNECTIONS


    1. Check for PCV hose connection Click here.

      OK
      PCV hose is connected correctly and is not damaged.

    NG

    REPAIR OR REPLACE PCV HOSE

    OK

  3. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leakage Click here.

      OK
      No leakage from intake system.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  4. CHECK THROTTLE VALVE


    1. Check the throttle valve condition.

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

    NG

    REPLACE THROTTLE BODY ASSEMBLY Click here

    OK

    REPLACE ECM Click here