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Home >> Toyota >> 2004 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (SFI) - Diagnosis >> DTC P0505: Idle Air Control System >> Inspection Procedure

Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine condition when 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 or the OBD II scan tool to the DLC3.
    2. Turn the power switch ON (IG).
    3. Turn the hand-held tester or the OBD II scan tool ON.
    4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    5. Read DTCs using the hand-held tester or the OBD II scan tool.
      1. Result: 
    DTC OUTPUT (IN ADDITION TO DTC P0505) RESULTS (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 RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

    A: GO TO NEXT STEP 

  2. CHECK CONNECTION OF PCV HOSE 

    OK: PCV hose is connected correctly and has no damage. 

    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.
      1. OK: No leakage in the air induction system. 

    NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: GO TO NEXT STEP 

    CHECK ELECTRIC THROTTLE CONTROL SYSTEM (See  ENGINE CONTROL SYSTEM  )