SFI SYSTEM, Diagnostic DTC:P0505

DTC Code DTC Name
P0505 Idle Control System Malfunction

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; 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; 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 connection

  • ECM

MONITOR DESCRIPTION

The ECM monitors the idling speed and idling air flow volume to conduct Idle Speed Control (ISC). The ECM determines that the ISC system is malfunctioning if either of the following conditions is met:


A01FFMYE17

MONITOR STRATEGY

Required Sensors/Components (Main) Electronic throttle control system
Required Sensors/Components (Related) Crankshaft position sensor, engine coolant temperature sensor and vehicle speed sensor
Frequency of Operation Continuous
MIL Operation 2 driving cycles

TYPICAL MALFUNCTION THRESHOLDS

Either condition is met 1 or 2
1. Both of following conditions A and B met -
A. Engine speed - Target engine speed Less than -100 rpm, or more than 200 rpm
B. IAC flow rate learned value 1.3 L/sec. or less, or 8.82 L/sec. or more for 5 seconds or more
2. Both of following conditions C and D met -
C. Frequency that both of following conditions (a) and (b) met 5 times or more
(a) Engine speed - Target engine speed Less than -100 rpm, or more than 200 rpm
(b) Vehicle condition Stopped after vehicle was driven by 10 km/h (6.25 mph) or more
D. Either condition is met (c) or (d)
(c) Amount of change of IAC flow rate learning value +2.49 L/sec. or more, or -3.765 L/sec. or less
(d) IAC flow rate learned value 1.3 L/sec. or less, or 8.82 L/sec. or more

CONFIRMATION DRIVING PATTERN

A01FG64E02

  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 [A].

  6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [B].

  7. Idle the engine for 5 minutes or more [C].

    Tech Tips

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

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

  9. Read the pending DTCs.

    Tech Tips


    • 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: P0505.

  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

    Tech Tips


    • 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 [E] and [F].

  13. Accelerate the vehicle to 10 km/h (6.25 mph) or more, and then idle the engine for 20 seconds or more [E].

  14. Repeat step [E] 5 times.

  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].

  16. Read the pending DTCs.

    Tech Tips


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

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

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

  18. Input the DTC: P0505.

  19. 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

    Tech Tips


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

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

INSPECTION PROCEDURE

Tech Tips


  • 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 GTS 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.

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. 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 the PCV hose connections Click here.

      OK
      PCV valve and hose are connected correctly and are not damaged.

    NG

    REPAIR OR REPLACE PCV HOSE

    OK

  3. CHECK INTAKE SYSTEM


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

      OK
      No leaks in the intake system.

      Tech Tips

      Perform "Inspection After Repair" after replacing the intake system Click here.


    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  4. CHECK THROTTLE BODY WITH MOTOR ASSEMBLY (THROTTLE VALVE)


    1. Check the throttle body with motor assembly condition.

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

      Tech Tips

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly Click here.


    NG

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY Click here

    OK

  5. CHECK WHETHER DTC OUTPUT RECURS (DTC P0505)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

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

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

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

    10. Read the pending DTCs.

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

    B

    END

    A

    REPLACE ECM Click here