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Home >> Lexus >> 2008 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P1442 Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1; DTC P1445 Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 2; DTC P2441 Secondary Air Injection System Switching Valve Stuck Close 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
      "P1442 and/or P1445" and P2441 A
      P1442 and/or P1445 B
      "P1442 and/or P1445 and/or P2441" and other DTCs C

      HINT:

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

    B: Go to step  5

    C: GO TO DTC CHART 

    A: Go to Next Step 

  2. CHECK VACUUM HOSES (THROTTLE BODY - VSV FOR AIR INJECTION SYSTEM) 
    1. Check that the vacuum hoses between the throttle body and VSV for air injection system are securely connected.

      OK: The vacuum hoses are securely connected. 

    2. Inspect the vacuum hoses for blockages and damage.

      OK: The vacuum hoses have no blockages and damage. 

    NG: REPAIR OR REPLACE VACUUM HOSES 

    Fig 1: Checking Vacuum Hoses (Throttle Body - VSV For Air Injection System)
    G04962702Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. CHECK PIPES AND HOSES (CONNECTION OF AIR INJECTION SYSTEM) 
    1. Remove the intake manifold (See REMOVAL  )
    2. Check all pipes and hoses of the air injection system

      OK: All air injection pipes and hoses are securely connected. 

    3. Check all pipes and hoses of the air injection system for blockage or damage.

      OK: All air injection pipes or hoses have no blockages or damage. 

    NG: REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING AND HOSES 

    Fig 2: Checking Pipes And Hoses (Connection Of Air Injection System)
    G04968016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  4. 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 3: 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 AND GO TO STEP  6

    Fig 4: 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 

  5. 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. Turn the ignition switch ON 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 open.
  6. CHECK VSV (FOR AIR INJECTION SYSTEM) 
    1. Turn the ignition switch OFF
    2. Disconnect the vacuum hoses from the VSV for the air injection system.
    3. Connect the Techstream to the DLC3.
    4. Start the engine and turn the tester ON.
    5. When the air switching valve is operated using the Techstream, check that negative pressure from port A.
    6. Enter the following menus: Powertrain/Engine and ECT/Utility/Air Injection Check/Manual Mode/Operation 2.

      HINT:

      Operation 2: AP: ON; EASV: OPEN; ASV1. OPEN; ASV2: OPEN

      Fig 5: Checking VSV (For Air Injection System)
      G05553394Courtesy 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 OFF when the Air Injection Check operation finishes.

      OK: Negative pressure from port A 

    7. Reconnect the vacuum hose.

    NG: Go to step  10

    OK: Go to Next Step 

  7. CHECK VACUUM HOSES (AIR SWITCHING VALVE - VSV FOR AIR INJECTION SYSTEM) 
    1. Check that the vacuum hoses between the No. 2 air switching valve (s) and VSV for the air injection system are securely connected.

      OK: The vacuum hose (s) are securely connected. 

    2. Check the vacuum hoses for blockages and damage.

      OK: The vacuum hoses have no blockages and damage. 

      Fig 6: Checking Vacuum Hoses (Air Switching Valve - VSV For Air Injection System)
      G05553395Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE VACUUM HOSES 

    OK: Go to Next Step 

  8. CHECK NO. 2 AIR SWITCHING VALVE (OPERATION) 
    1. Remove the No. 2 air switching valve.
      Fig 7: Blowing Air Into Port B And Check That Air Is Not Discharged From Port C
      G04968011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Blow air into port B and check that air is not discharged from port C.

      OK: Not discharged from port C 

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

    OK: Go to Next Step 

  9. CHECK AIR INJECTION PIPE (NO. 2 AIR SWITCHING VALVE - EXHAUST MANIFOLD) 
    1. Check that the air injection pipe between the No. 2 air switching valve (s) and exhaust manifold are securely connected.

      OK: The air injection pipe is securely connected. 

    2. Check the air injection pipe for blockages and damage.

      OK: The air injection pipe has no blockages and damage. 

    NG: REPAIR OR REPLACE AIR INJECTION PIPE 

    Fig 9: Checking Air Injection Pipe (No. 2 Air Switching Valve - Exhaust Manifold)
    G04968024Courtesy 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 the air injection system connector.
    3. Blow air into port B. 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)
    G04968025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

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