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Home >> Lexus >> 2006 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P0505 Idle Air Control System >> Inspection Procedure
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Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 OTHER DTC OUTPUT (IN ADDITION TO DTC P0505) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to ON and turn the hand-held tester ON.
    3. Select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    4. Read the DTCs.

      Result: 

      OTHER DTC OUTPUT (IN ADDITION TO DTC P0505)

      Display (DTC output) Proceed To
      P0505 A
      P0505 and other DTCs B

      HINT:

      If any other codes besides P0505 are output, perform troubleshooting for those DTCs first.

    B: GO TO DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART  ) 

    A: Go to next step. 

  2. CHECK CONNECTION OF PCV HOSE 

    NG: REPAIR OR REPLACE PCV HOSE 

    OK: Go to next step. 

  3. CHECK AIR INDUCTION SYSTEM 
    1. Check for vacuum leaks in the air induction system.

    NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: Go to next step. 

  4. INSPECT THROTTLE W/MOTOR BODY ASSY 
    1. Check the throttle valve condition.

    NG: REPLACE THROTTLE W/MOTOR BODY ASSY 

    OK: REPLACE ECM (See  REPLACEMENT  )