SFI SYSTEM, Diagnostic DTC:P0505

DTC Code DTC Name
P0505 Idle Control System Malfunction

DESCRIPTION

The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS 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 ETCS. 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 the target idle speed (2 trip detection logic).

  • Electronic throttle control system

  • Intake system

  • PCV hose connections

  • EGR valve assembly

  • ECM

MONITOR DESCRIPTION

The ECM monitors the idle 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:

MONITOR STRATEGY

Related DTCs P0505: Idle air control system functional check
Required Sensors/Components (Main) Electronic throttle control system
Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Vehicle speed sensor
Frequency of Operation Once per driving cycle
Duration 10 minutes (idling after warm up)
MIL Operation 2 driving cycles
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

P0010 (VVT oil control valve)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0016 (VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor heater)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)

P0171, P0172 (Fuel system)

P0301, P0302, P0303, P0304 (Misfire)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0351, P0352, P0353, P0354 (Igniter)

P0401 (EGR system (closed))

P0451, P0452, P0453 (EVAP system)

P219A (Air fuel ratio imbalance)
Engine Running

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met 1 or 2
1. Both of the following conditions A and B met -
A. Engine speed - Target engine speed Less than -100 rpm, or higher than 150 rpm
B. IAC flow rate learned value 0.9 L/sec. or less, or 7 L/sec. or more for 5 seconds or more
2. Both of the 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 higher than 150 rpm
(b) Vehicle condition Stopped after being driven at 10 km/h (6.25 mph) or more
D. Either of the following conditions is met (c) or (d)
(c) Amount of change of IAC flow rate learned value +2.2 L/sec. or more, or -3.354 L/sec. or less
(d) IAC flow rate learned value 0.9 L/sec. or less, or 7 L/sec. or more

CONFIRMATION DRIVING PATTERN

A011XK3E05

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

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

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

  5. Turn the power switch on (IG) and turn the Techstream on [A].

  6. Put the engine in inspection mode (maintenance mode) Click here.

  7. Start the engine and idling until the coolant temperature reaches 70°C (158°F) or higher with all the accessories switch off [B].

  8. Turn the power switch off and wait for at least 30 seconds.

  9. Disconnect the cable from the negative (-) auxiliary battery terminal.

  10. Reconnect the cable to the negative (-) auxiliary battery terminal.

  11. Turn the power switch on (IG) and turn the Techstream on.

  12. Put the engine in inspection mode (maintenance mode) Click here.

  13. Start the engine and rev the engine for 5 seconds with the shift lever in P [C].

  14. Idle the engine for 5 minutes or more [D].

    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.

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

  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.

    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 [F] through [I].

  20. Accelerate the vehicle to 10 km/h (6.25 mph) or more [F].

    CAUTION:

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

  21. Stop the vehicle and rev the engine for 5 seconds with the shift lever in P [G].

  22. Idle the engine for 20 seconds or more [H].

  23. Repeat the steps [F] through [H] 10 times.

  24. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [I].

  25. 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.

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

  27. Input the DTC: P0505.

  28. Check the DTC judgment result.

    Techstream 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.

  29. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips

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

    • If a permanent DTC is not output, the system is normal.

INSPECTION PROCEDURE

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

Tech Tips

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

    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 Techstream. 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 Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream 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 from the intake system.

      Tech Tips

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

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      Tech Tips

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

      		 MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips

      During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

      Result
      Result Proceed to
      NG A
      OK B
    B

    INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE) Click here

    A

  5. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly Click here.

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  6. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE)

    1. Check the throttle with motor body assembly condition.

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

      Tech Tips

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

    NG

    REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY Click here

    OK

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0505)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs.

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

    6. Turn the power switch on (IG).

    7. Turn the Techstream on.

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

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

    10. Read the DTCs.

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

    END

    A

    REPLACE ECM Click here