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Home >> Scion >> 2005 >> xA Automatic >> Repair and Diagnosis >> Engine Performance >> SFI System >> DTC P0505, P0511: Idle Air Control System, Idle Air Control Circuit >> Inspection Procedure >> Hand-Held Tester:
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Hand-Held Tester:

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO PTC P0505) 
    1. Connect a hand-held tester to the DLC3.
    2. Turn the ignition switch to ON and turn the tester ON.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    4. Read DTCs.

      Result: 

      DTC RESULT

      Display (DTC Output) Proceed To
      P0505 A
      P0511 B
    1. B : Go to step   7 
    2. A : GO TO NEXT STEP 
  2. CHECK PCV HOSE CONNECTIONS 

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

    1. NG : REPAIR OR REPLACE PCV HOSE 
    2. OK : GO TO NEXT STEP 
  3. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage.

      OK : No leakage from air induction system. 

    1. NG : REPAIR OR REPLACE AIR INDUCTION SYSTEM 
    2. OK : GO TO NEXT STEP 
  4. PERFORM ACTIVE TEST USING HAND-HELD TESTER (CHECK IAC VALVE OPERATION) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to ON and turn the tester ON.
    3. Start the engine and warm it up to the normal operating temperature.
    4. Switch off all the accessories (where on).
    5. Switch off A/C (where on).
    6. Move the gear selector lever to the N position.
    7. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / IAC DUTY RATIO.
    8. Check that the engine speed varies when the Idle Air Control (IAC) duty ratio is changed using the tester.

      OK : Engine speed fluctuates according to IAC duty ratio variation. 

    1. OK : (See  CHECK FOR INTERMITTENT PROBLEMS   ) 
    2. NG : GO TO NEXT STEP 
  5. CHECK A/C SIGNAL CIRCUIT 
    1. NG : REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 
    2. OK : GO TO NEXT STEP 
  6. CHECK FOR BLOCKAGE IN IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE 
    1. NG : REPLACE IDLE AIR CONTROL VALVE 
    2. OK : GO TO NEXT STEP 
  7. CHECK HARNESS AND CONNECTOR (BATTERY - IAC VALVE, IAC VALVE - BODY GROUND) 
    1. Disconnect the I1 IAC valve connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the terminals of the IAC valve wire harness side connector.

      Standard: 

      IAC VALVE WIRE HARNESS SIDE CONNECTOR VOLTAGE SPECIFICATIONS

      Tester Connections Specified Conditions
      VISC (I1-2) - GND (I1-3) between 9 V and 14 V
    4. Reconnect the IAC valve connector.
      Fig 1: Disconnecting I1 IAC Valve Connector
      G03196306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  8. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) 
    1. Disconnect the I1 IAC valve connector.
    2. Disconnect the E3 ECM connector.
    3. Check the resistance.

      Standard (Check for open): 

      RESISTANCE SPECIFICATIONS FOR OPEN

      Tester Connections Specified Conditions
      DUTY (I1-1) - RSD (E3-5) Below 1 Ω
      GND (I1-3) - E01 (E3-7) Below 1 Ω

      Standard (Check for short): 

      Fig 2: Disconnecting E3 ECM Connector
      G03196307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATIONS FOR SHORT

      Tester Connections Specified Conditions
      DUTY (I1-1) or RSD (E3-5) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the IAC valve connector.
      Fig 3: Reconnecting IAC Valve Connector
      G03196308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : GO TO NEXT STEP 
  9. INSPECT IDLE AIR CONTROL VALVE (See  ON-VEHICLE INSPECTION  ) 
    1. NG : REPLACE IDLE AIR CONTROL VALVE 
    2. OK : REPLACE ECM (See  REPLACEMENT  ) 
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