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Home >> Toyota >> 2006 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) (2ZZ-GE) - Diagnostics) >> DTC P0505: Idle Air Control System, DTC P0511 Idle Air Control Circuit >> Inspection Procedure >> Hand-held tester:

Hand-held tester:

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC 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 OUTPUT 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:  CHECK FOR INTERMITTENT PROBLEMS  
    2. NG: GO TO NEXT STEP 
  5. CHECK A/C SIGNAL CIRCUIT (See  INSPECTION  ) 
    1. NG: REPAIR OR REPLACE MALFUNCTIONING PARTS 
    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: 

      BATTERY - IAC VALVE, IAC VALVE - BODY GROUND VOLTAGE

      Tester Connections Specified Conditions
      VISC (I1-2) - GND (I1-3) 9 to 14 V
    4. Reconnect the IAC valve connector.
      Fig 1: Identifying Terminals Of IAC Valve Connector
      G02599381Courtesy 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): 

      IAC VALVE - ECM RESISTANCE (CHECK FOR OPEN)

      Tester Connection Specified Condition
      DUTY (I1-1) - RSO (E3-16) Below 1 Ω
      GND (I1-3) - E01 (E3-7) Below 1 Ω

      Standard (Check for short): 

      IAC VALVE - ECM RESISTANCE (CHECK FOR SHORT)

      Tester Connection Specified Condition
      DUTY (I1-1) or RSO (E3-16) - Body ground 10 kΩ or higher
      Fig 2: Disconnecting E3 ECM Connector
      G02599382Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Reconnect the ECM connector.
    5. Reconnect the IAC valve connector.
      Fig 3: Identifying Terminals Of IAC Valve Connector
      G02599383Courtesy 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  SFI SYSTEM (2ZZ-GE)  ) 
    1. NG: REPLACE IDLE AIR CONTROL VALVE 
    2. OK: GO TO NEXT STEP 

      REPLACE ECM (See  ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT  ) 

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