DTC    P0505    Idle Control System Malfunction

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DESCRIPTION

The idling speed is controlled by the Electronic Throttle Control System (ETCS). 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 (TP) sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position (APP) sensor, which detects the accelerator pedal position; and 5) the ECM, which controls the ETCS. 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)
  1. Throttle body assembly
  2. Air induction system
  3. Ventilation hose connection
  4. PCV hose
  5. EGR valve assembly
  6. ECM

INSPECTION PROCEDURE

HINT:
  1. The following condition may also cause DTC P0505 to be set:
    1. The floor carpet overlaps 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 is not fully released.
  2. Read freeze frame data using an 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.

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTC.

Result 
Result
Proceed to
P0505
A
P0505 and other DTCs
B


B
GO TO DTC CHART (Click here)
A


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (OPERATE EGR VALVE)

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

  1. Check the MAP in Data List and the idling condition while performing Active Test.

    OK:
    MAP and idling condition change in response to EGR step position.


Standard:

-
EGR Step Position (Active Test)
0 Steps
0 to 30 Steps
30 to 40 Steps or Higher
Idling condition
Steady idling
Engine changes from steady to rough idling
Engine changes from rough idling to engine stall
MAP value
(Data List)
28 to 48 kPa
(EGR valvu is fully closed)
MAP value is at least +10 to 15 kPa higher than when EGR valve is fully closed
80 to 110 kPa
(After engine stall)

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

Result 
Result
Proceed to
Outside standard range
A
Within standard range
B


B
Go to step 4
A


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0401)

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Switch the ECM from normal mode to check mode.

  1. Drive the vehicle at 60 km/h (37 mph) with the shift lever in B.

    CAUTION:
    1. Strictly observe speed limits and traffic laws when performing the confirmation drive pattern.

  1. Perform fuel-cut operation for 5 seconds or more, with the accelerator pedal fully released.

    HINT:
    1. If the deceleration was not completed, perform the confirmation driving pattern again.

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

  1. Input the DTCs to be confirmed.

  1. Check the DTC judgment result.

Result 
Result
Proceed to
No output
A
P0401
B

Intelligent Tester 
Tester Display
Description
NORMAL
  1. DTC judgment completed
  2. System normal
ABNORMAL
  1. DTC judgment completed
  2. System abnormal
INCOMPLETE
  1. DTC judgment not completed
  2. You should perform driving pattern after confirming DTC enabling conditions
UNKNOWN
  1. Unable to perform DTC judgment
  2. Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

HINT:
  1. If the DTC judgment result is INCOMPLETE or UNKNOWN, drive the vehicle again at 60 km/h (37 mph) with the shift lever in B, perform fuel-cut operation for 5 seconds or more with the accelerator pedal fully released, and check the DTC judgment result.



B
GO TO DTC CHART (Click here)
A


4.CHECK PCV HOSE CONNECTIONS

OK:
PCV hose is connected correctly and is not damaged.



NG
REPAIR OR REPLACE PCV HOSE
OK


5.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leak.

    OK:
    No leak from air induction system.



NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK


6.INSPECT THROTTLE BODY ASSEMBLY (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)