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Home >> Toyota >> 2006 >> Matrix XRS >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2ZZ-GE) >> SFI System >> DTC P0505 Idle Control System Malfunction; DTC P0511 Idle Air Control Circuit >> Inspection Procedure

Inspection Procedure

HINT:

Read freeze frame data using an intelligent tester or OBD II scan tool. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air / fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

When using intelligent tester: 

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) 
    1. Connect an intelligent 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 REFERENCE

      Display (DTC output) Proceed to
      P0505 A
      P0511 B

    B: Go to step   7 

    A: Go to next step 

  2. CHECK PCV HOSE (CONNECTION) 

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

    NG: REPAIR OR REPLACE PCV HOSE 

    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. 

    NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: GO TO NEXT STEP 

  4. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (CHECK IAC VALVE OPERATION) 
    1. Connect the intelligent 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. 

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: GO TO NEXT STEP 

  5. CHECK A/C SIGNAL CIRCUIT 

    NG: REPAIR OR REPLACE A/C SIGNAL CIRCUIT 

    OK: GO TO NEXT STEP 

  6. CHECK IDLE AIR CONTROL VALVE 
    1. Check for the blockage in idle air control valve and passage to bypass throttle valve.

    NG: REPLACE IDLE AIR CONTROL VALVE 

    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 voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      VISC (I1-2) - GND (I1-3) 9 to 14 V
    4. Reconnect the IAC valve connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying IAC Valve Connector Terminals
    G04460769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    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. Measure the resistance.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFIED CONDITIONS (FOR OPEN)

      Tester Connections Specified Conditions
      DUTY (I1-1) - RSO (E3-16) Below 1
      GND (I1-3) - E01 (E3-7) Below 1

      Standard resistance (Check for short) 

      RESISTANCE SPECIFIED CONDITIONS (FOR SHORT)

      Tester Connections Specified Conditions
      DUTY (I1-1) or RSO (E3-16) - Body ground 10 k or higher
    4. Reconnect the ECM connector.
    5. Reconnect the IAC valve connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Disconnecting E3 ECM And I1 IAC Valve Connector
    G04460770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  9. INSPECT IDLE AIR CONTROL VALVE 
    1. Inspect the IDLE AIR CONTROL VALVE  .

    NG: REPLACE IDLE AIR CONTROL VALVE 

    OK: REPLACE ECM 

When Using OBD II Scan Tool: 

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0505) 
    1. Connect an OBD II scan tool to the DLC3.
    2. Turn the ignition switch to ON and turn the scan tool ON.
    3. Read DTCs using the scan tool.

      Result 

      DTC OUTPUT RESULT REFERENCE

      Display (DTC output) Proceed to
      P0505 A
      P0511 and other DTCs B

    B: Go to step   6 

    A: Go to next step 

  2. CHECK PCV HOSE (CONNECTION) 

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

    NG: REPAIR OR REPLACE PCV HOSE 

    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. 

    NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: GO TO NEXT STEP 

  4. CHECK A/C SIGNAL CIRCUIT 

    NG: REPAIR OR REPLACE A/C SIGNAL CIRCUIT 

    OK: GO TO NEXT STEP 

  5. CHECK IDLE AIR CONTROL VALVE 
    1. Check for the blockage in idle air control valve and passage to bypass throttle valve.

    NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE 

    OK: GO TO NEXT STEP 

  6. CHECK HARNESS AND CONNECTOR (BATTERY - IAC VALVE, IAC VALVE - BODY GROUND) 
    1. Disconnect the I1 Idle Air Control (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 voltage 

      VOLTAGE SPECIFIED CONDITIONS

      Tester Connections Specified Conditions
      VISC (I1-2) - GND (I1-3) 9 to 14 V
    4. Reconnect the IAC valve connector.
      Fig 3: Identifying IAC Valve Connector Terminals
      G04460771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    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. Measure the resistance.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFIED CONDITIONS (FOR OPEN)

      Tester Connections Specified Conditions
      DUTY (I1-1) - RSO (E3-16) Below 1
      GND (I1-3) - E01 (E3-7) Below 1

      Standard resistance (Check for short) 

      RESISTANCE SPECIFIED CONDITIONS (FOR SHORT)

      Tester Connections Specified Conditions
      DUTY (I1-1) or RSO (E3-16) - Body ground 10 k or higher
    4. Reconnect the ECM connector.
    5. Reconnect the IAC valve connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Disconnecting E3 ECM Connector
    G04460772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP 

  8. INSPECT IDLE AIR CONTROL VALVE 
    1. Inspect the IDLE AIR CONTROL VALVE  .

    NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE 

    OK: REPLACE ECM 

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