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Home >> Lexus >> 2013 >> RX 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0505 - P1603)) >> SFI System >> DTC P0505: Idle Control System Malfunction (03/2012 - 07/2012) >> Procedure
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DTC P0505: Idle Control System Malfunction (03/2012 - 07/2012): Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Result

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

      HINT: 

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

    B → See step   6 

    A: Go to next step 

  2. CHECK PCV HOSE CONNECTIONS 
    1. Check the PCV hose connections. Refer to COMPONENTS [03/2012 - ] .

      OK

      PCV hose is connected correctly and is not damaged.

    NG → See step   7 

    OK: Go to next step 

  3. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leaks. Refer to ON-VEHICLE INSPECTION [03/2012 - ] .

      OK

      No leaks in intake system.

    NG → REPAIR OR REPLACE INTAKE SYSTEM 

    OK: Go to next step 

  4. INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (THROTTLE VALVE) 
    1. Check for contamination between the throttle valve and housing, and check that the throttle valve moves smoothly.

      OK

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

    NG → See step   8 

    OK: Go to next step 

  5. CONFIRM WHETHER DTC OUTPUT RECURS 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.
    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
    8. Read the pending DTCs.
      RESULT

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

    B → END 

    A → See step   9 

  6. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2012 - 07/2012] 
  7. REPAIR OR REPLACE PCV HOSE. Refer to  REMOVAL [03/2012 - 07/2012] 
  8. REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  9. REPLACE ECM. Refer to  REMOVAL [03/2012 - 07/2012]