SFI SYSTEM, Diagnostic DTC:P0505

DESCRIPTION

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS 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; 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.

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 the following condition is met:

• After driving at a vehicle speed of 10 km/h (6.25 mph) or more, the difference between the target and actual engine idling speed exceeds the threshold 5 times or more during a driving cycle, and then the system determines that the IAC flow rate learned value is stuck at the upper or lower limit, or that the IAC flow rate learned value has been changed by an amount that exceeds the threshold.

CONFIRMATION DRIVING PATTERN

1. Connect the intelligent tester to the DLC3.

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

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

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

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

6. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Coolant Temp.

7. Start the engine and warm it up until the engine coolant temperature is 70°C(158°F) or higher with all the accessories off [B].

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

9. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

10. Turn the power switch on (IG) and turn the intelligent tester on [D].

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

12. Turn the power switch on (READY) and race the engine for 5 seconds with the shift lever in P [E].

    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.

13. Allow the engine to idle for 5 minutes or more [F].

    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.

14. Enter the following menus: Powertrain / Engine and ECT / DTC [G].

15. 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.

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

17. Input the DTC: P0505.

18. Check the DTC judgment result.

    Tester 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 [D] and [F].

19. Accelerate the vehicle to a speed of 10 km/h (6.25 mph) or more, and then decelerate to a stop [H].

20. Race the engine for 5 seconds or more with the shift lever in P, and then allow the engine to idle for 20 seconds or more [I].

21. Repeat step [H] and [I] 10 times.

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

23. 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.

24. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness [J].

25. Input the DTC: P0505.

26. Check the DTC judgment result.

    Tester 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.

CAUTION / NOTICE / HINT

PROCEDURE

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

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the tester ON.

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

   5. Read the DTCs.

      Result

      Display (DTC Output)	Proceed to
      P0505	A
      P0505 and other DTCs	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 (HOSE CONNECTIONS)

   OK
   PCV hose is connected correctly and is not damaged.

   
   

   NG

   REPAIR OR REPLACE PCV HOSE Click here

   OK

3. CHECK AIR INDUCTION SYSTEM

   
   

   1. Check the air induction system for vacuum leakage Click here.

      OK
      No leakage from air induction system.

   
   

   NG

   REPAIR OR REPLACE AIR INDUCTION SYSTEM

   OK

4. CHECK THROTTLE BODY (VISUALLY CHECK THROTTLE VALVE)

   
   

   1. Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body. And check that the throttle valve moves smoothly.

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

   
   

   OK

   REPLACE ECM Click here

   NG

   REPLACE THROTTLE BODY Click here