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Home >> Lexus >> 2008 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P1441 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1; DTC P1444 Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 2; DTC P2440 Secondary Air Injection System Switching Valve Stuck Open Bank 1 >> Inspection Procedure

Inspection Procedure

HINT:

Read freeze frame data using the Techstream. 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.

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR INJECTION SYSTEM DTCS) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.
    4. Read the DTCs.

      Result 

      RESULT REFERENCE

      Display (DTC Output) Proceed to
      "P1441 and/or P1444" and P2440 A
      P1441 and/or P1444 B
      "P1441 and/or P1444 and/or P2440" and other DTCs C

      HINT:

      If any DTCs other than P1441, P1444 or P2440 are output, troubleshoot those DTCs first.

    B: Go to step  7

    C: GO TO DTC CHART 

    A: Go to Next Step 

  2. CHECK AIR SWITCHING VALVE (OPERATION) 
    1. Remove the intake manifold (See REMOVAL  ).
    2. Remove the Air Switching Valve (ASV).
    3. Blow air into port A and check that air is not discharged from port B.

      OK: Not discharged 

      Fig 1: Blowing Air Into Port A And Check That Air Is Not Discharged From Port B
      G04968003Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Apply battery positive voltage across the terminals.
    5. Blow air into port A and check that air is discharged from port B.

      OK: Discharged 

    NG: REPLACE AIR SWITCHING VALVE 

    Fig 2: Blowing Air Into Port A And Check That Air Is Discharged From Port B
    G04968004Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK AIR SWITCHING VALVE (VOLTAGE) 
    1. Remove the intake manifold (See REMOVAL  ).
    2. Disconnect the A47 ASV connector.
    3. Turn the ignition switch ON.
    4. Measure the voltage between terminal 1 of the air switching valve connector and body ground.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Specified Condition
      A47-1 - Body ground Below 1.0 V
    5. Reconnect the ASV connector.

    NG: Go to step 4 

    Fig 3: Checking Air Switching Valve (Voltage)
    G05843607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK FOR INTERMITTENT PROBLEMS 

  4. CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - AIR SWITCHING VALVE) 
    1. Remove the intake manifold (See REMOVAL  ).
    2. Disconnect the A44 air injection driver connector.
    3. Disconnect the A47 air switching valve connector.
    4. Disconnect the battery positive terminal cable.
    5. Measure the resistance between the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      VV (A44-6) - A47-1 Below 1 Ω
      VV (A44-6) or A47-1 - Battery positive terminal cable 10 kΩ or higher
    6. Reconnect the air injection driver connector.
    7. Reconnect the ASV connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 4: Checking Harness And Connector (Air Injection Control Driver - Air Switching Valve)
    G05843608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  5. CHECK AIR INJECTION CONTROL DRIVER (VOLTAGE) 
    1. Disconnect the A44 Air Injection Control Driver (AID) connector.
    2. Turn the ignition switch ON.
    3. Measure the voltage between terminal 3 (SIV) of the AID connector and body ground.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Specified Condition
      SIV (A41-3) - Body ground 10 V or more
    4. Reconnect the AID connector.

    NG: Go to step 6 

    Fig 5: Checking Air Injection Control Driver (Voltage)
    G05264149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE AIR INJECTION CONTROL DRIVER 

  6. CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - ECM) 
    1. Disconnect the air injection driver connector.
    2. Disconnect the E9 ECM connector.
    3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open) 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      SIV (A44-3) - AIRV (E9-4) Below 1 Ω

      Standard resistance (Check for short) 

      STANDARD RESISTANCE

      Tester Connection Specified Condition
      SIV (A44-3) or AIRV (E9-4) - Body ground 10 kΩ or higher
    4. Reconnect the air injection driver connector.
    5. Reconnect the ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Checking Harness And Connector (Air Injection Control Driver - ECM)
    G05843610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

  7. CHECK NO. 2 AIR SWITCHING VALVE (OPERATION) 
    1. Start the engine and warm it up.
    2. Turn the ignition switch OFF.
    3. Connect the Techstream to the DLC3.
    4. Start the engine and turn the tester ON.
    5. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Manual Mode/Operation 5 and 6.

      HINT:

      Operation 5: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: CLOSE

      Operation 6: AP: ON; EASV: OPEN; ASV1: CLOSE; ASV2: OPEN

      NOTE:
      • This test only allows technicians to operate the AIR system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.

        While the AIR system operation using the Techstream is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.

      • When performing the Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
      • Turn the ignition switch OFF when the Air Injection Check operation finishes.
    6. Read values of the air-fuel ratio on the Techstream.

      Result 

      RESULT REFERENCE

      Air switching valve No. 2 operation Air fuel ratio
      Open 18 or more
      Closed Approximately 14.5

      HINT:

      • When the No. 2 ASV operates normally, the A/F value is 18 or more when the valve is open, and approximately 14.5 when the valve is closed.
      • Perform the following procedures only on the bank of which the valve is not closed.
  8. CHECK VSV (FOR AIR INJECTION SYSTEM) 
    1. Turn the ignition switch OFF.
    2. Disconnect the vacuum hose from the VSV for air injection system.
    3. Connect the Techstream to the DLC3.
    4. Start the engine and turn the tester ON.
    5. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Manual Mode/Operation 1.
    6. At this time, check that no negative pressure generates at port A of the VSV.

      HINT:

      Operation 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE

      Fig 7: Checking VSV (For Air Injection System)
      G05843611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • This test only allows technicians to operate the AIR system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.

        While the AIR system operation using the Techstream is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.

      • When performing the Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
      • Turn the ignition switch to OFF when the Air Injection Check operation finishes.

      OK: No negative pressure is generated. 

    7. Reconnect the vacuum hose.

    NG: Go to step  10

    OK: Go to Next Step 

  9. CHECK NO. 2 AIR SWITCHING VALVE (OPERATION) 
    1. Remove the No. 2 air switching valve.
    2. Blow air into port B and check that air is not discharged from port C.

      OK: Not discharged from port C 

      Fig 8: Blowing Air Into Port B And Check That Air Is Not Discharged From Port C
      G04968011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Apply vacuum 30 kPa (225 mmHg) to port A, blow air into port B and check that air is discharged from port C.

      OK: Discharged from port C 

    NG: REPLACE NO. 2 AIR SWITCHING VALVE 

    Fig 9: Blowing Air Into Port B And Check That Air Is Discharged From Port C
    G04968012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK FOR INTERMITTENT PROBLEMS 

  10. CHECK VSV (FOR AIR INJECTION SYSTEM) 
    1. Disconnect the 2 vacuum hoses.
    2. Disconnect the VSV for air injection system connector.
    3. Blow air into port B and check that air does not flow from port A.

      OK: Air does not flow from port A 

    4. Apply battery positive voltage across the terminals. Then blow air into port B and check that air flows from port A.

      OK: Air flows from port A 

    NG: REPLACE VSV 

    Fig 10: Checking VSV (For Air Injection System)
    G05843614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  11. CHECK HARNESS AND CONNECTOR (ECM - VSV FOR AIR INJECTION SYSTEM) 
    1. Remove the intake manifold (See REMOVAL  ).
    2. Disconnect the E5 ECM connector.
    3. Disconnect the V10 and V11 VSV for air injection system control connector.
    4. Measure the resistance between the VSV connector and ECM.

      Standard resistance 

      STANDARD RESISTANCE

      Tester connection Specified condition
      AIV1 (E5-27) - VSV (V10-2) Below 1 Ω
      AIV2 (E5-26) - VSV (V11-2)
    5. Measure the resistance between the VSV connector and body ground.

      Standard resistance 

      STANDARD RESISTANCE

      Tester connection Specified condition
      AIV1 (E5-27) or VSV (V10-2) - Body ground 10 kΩ or higher
      AIV2 (E5-26) or VSV (V11-2) - Body ground
    6. Reconnect the ECM connector.
    7. Reconnect the VSV connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 11: Checking Harness And Connector (ECM - VSV For Air Injection System)
    G05264142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

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