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Home >> Toyota >> 2004 >> Matrix Base, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (SFI) - Diagnostics (1ZZ-FE) >> DTC P0505: Idle Air Control System, DTC P0511: Idle Air Control Circuit >> Inspection Procedure >> OBD II scan tool (excluding hand-held tester):

OBD II scan tool (excluding hand-held tester):

  1. CHECK OTHER DTC OUTPUT 
    1. Connect the hand-held tester to the DLC3.

      Result: 

      DTC OUTPUT DISPLAY

      Display (DTC output) Proceed to
      P0505 A
      "P0511" and other DTCs B
    1. B: Go to step   6 . 
    2. A: Go to next step. 
  2. CHECK CONNECTION OF PCV HOSE 
    1. NG: REPAIR OR REPLACE PCV HOSE 
    2. OK: Go to next step. 
  3. CHECK AIR INDUCTION SYSTEM 
    1. NG: REPAIR OR REPLACE 
    2. OK: Go to next step. 
  4. CHECK A/C SIGNAL CIRCUIT 
    1. NG: REPAIR OR REPLACE 
    2. OK: Go to next step. 
  5. CHECK BLOCKAGE OF IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE 
    1. NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE 
    2. OK: Go to next step. 
  6. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the I1 IAC valve connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage between the terminals of the IAC valve wire harness side connector.

      Standard: 

      CONNECTOR SPECIFIED CONDITION

      Tester Connection Specified Condition
      VISC (I1-2) - GND (I1-3) 9 to 14 V
    4. Reconnect the IAC valve connector.
      Fig 1: Measuring Voltage Between Terminals Of IAC Valve Wire Harness Side Connectors
      G02914855Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to next step. 
  7. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) 
    1. Disconnect the I1 IAC valve connector.
    2. Disconnect the E3 ECM connector.
    3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      Fig 2: Connector (Open) Specified Condition Table
      G02914856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Disconnecting E3 ECM Connector
      G02914857Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      CONNECTOR (SHORT) SPECIFIED CONDITION

      Tester Connection Specified Condition
      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 4: Checking Resistance Between Wire Harness Side Connector
      G02914858Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to next step. 
  8. INSPECT IDLE AIR CONTROL VALVE (See  ON-VEHICLE INSPECTION  ) 
    1. NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE 
    2. OK: REPLACE ECM (See  REPLACEMENT  ) 
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