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Home >> Lexus >> 2007 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2UZ-FE) >> 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 intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR INJECTION SYSTEM DTCS) 
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
    4. Read 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: Identifying Air Switching Valve Ports
      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: Checking Air Switching Valve (Operation)
    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 A59 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 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      A59-1 - Body ground Below 1.0 V
    5. Reconnect the ASV connector.

    NG: Go to step 4 

    Fig 3: Identifying ASV Connector Terminals
    G05282329Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: CHECK FOR INTERMITTENT PROBLEMS 

  4. CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - AIR SWITCHING VALVE) 
    1. Check the harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK AIR INJECTION CONTROL DRIVER (VOLTAGE) 
    1. Disconnect the A56 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 

      VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      A56-3 (SIV) - Body ground 10 V or more
    4. Reconnect the AID connector.

    NG: Go to step 6 

    Fig 4: Identifying Air Injection Control Driver Connector Terminals
    G05282330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE AIR INJECTION CONTROL DRIVER 

  6. CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - ECM) 
    1. Check the harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    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 intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    4. Start the engine and push the intelligent tester main switch ON.
    5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / 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

      Fig 5: Intelligent Tester Display - AIR INJ CHECK
      G04968009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • This test only allows technicians to operate the Al 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 Al system operation using the intelligent tester 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 INJ 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 INJ CHECK operation finishes.
    6. Read values of the A/F BANK1 and BANK2 on the intelligent tester.

      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 intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    4. Start the engine and turn the tester ON.
    5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL /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 6: Identifying VSV Port A
      G05196762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • This test only allows technicians to operate the Al 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 Al system operation using the intelligent tester 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 INJ 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 INJ 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 7: Identifying Air Switching Valve Ports
      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 8: Checking No 2 Air Switching Valve (Operation)
    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 

      Fig 9: Identifying VSV Ports
      G05196765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
    G05196766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (ECM - VSV FOR AIR INJECTION SYSTEM) 
    1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

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