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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Engine Control System (3UR-FBE) - Diagnostic Codes (6 Of 6)) >> SFI System >> DTC P2444: Secondary Air Injection System Pump Stuck On Bank1; DTC P2445: Secondary Air Injection System Pump Stuck Off Bank1; DTC P2446: Secondary Air Injection System Pump Stuck On Bank 2; DTC P2447: Secondary Air Injection System Pump Stuck Off Bank 2 [08/2017 - 08/2018] >> Procedure

DTC P2444: Secondary Air Injection System Pump Stuck On Bank1; DTC P2445: Secondary Air Injection System Pump Stuck Off Bank1; DTC P2446: Secondary Air Injection System Pump Stuck On Bank 2; DTC P2447: Secondary Air Injection System Pump Stuck Off Bank 2 [08/2017 - 08/2018]: Procedure

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444, P2445, P2446 AND/OR P2447) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    4. Read DTCs.
      RESULT

      Result Proceed to
      P2444, P2445, P2446 and/or P2447 are output A
      P2444, P2445, P2446 and/or P2447 and P0418 and/or P0419 are output B
      P2444, P2445, P2446 and/or P2447 and other DTCs (except P0418 and P0419) are output C

      If any DTCs other than P0418, P0419, P2444, P2445, P2446 and/or P2447 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO AIR PUMP INSPECTION PROCEDURE 

    (Refer to CAUTION / NOTICE / HINT )

    Result: 

    C 

    GO TO DTC CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2017 - 08/2018] )

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA (AIR PUMP FREEZE AND AIR SWITCHING VALVE FREEZE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream on.
    3. Read the values of Air Pump Freeze, Air Pump2 Freeze, Air Switching Valve Freeze and Air Switching Valve2 Freeze from the freeze frame data recorded previously.
    4. Referring to the following table, proceed to the appropriate step according to the result of the data reading.
      RESULT

      Result Proceed to
      Air Pump Freeze Air Pump2 Freeze Air Switching Valve Freeze Air Switching Valve2 Freeze
      OFF OFF OFF OFF B
      Except above A

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE AIR PUMP HEATER) 
    1. Disconnect the air pump connector.
      GTY540098Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON and turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT/ Active Test / Activate the Air Pump Heater.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D35-1 (APH+) - Body ground Activate the Air Pump Heater is ON 11 to 14 V
      D36-1 (APH+) - Body ground Activate the Air Pump Heater is ON 11 to 14 V

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  4

  4. INSPECT AIR PUMP (HEATER RESISTANCE) 
    1. Inspect the air pump (Refer to INSPECTION [08/2015 - 08/2018] ).

    Result: 

    NG 

    REPLACE AIR PUMP 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  5

  5. INSPECT AIR PUMP HEATER RELAY (AI-HTR) 
    1. Inspect the air pump heater relay (AI-HTR) (Refer to PROCEDURE - Step 7 ).

    Result: 

    NG 

    REPLACE AIR PUMP HEATER RELAY (AI-HTR) 

    Result: 

    OK 

    See step  6

  6. CHECK AIR PUMP HEATER RELAY (AI-HTR) (POWER SOURCE) 
    1. Remove the air pump heater relay (AI-HTR).
    2. Measure the voltage according to the value(s) in the table below.
      GTY763968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Condition Specified Condition
      AI-HTR relay terminal 3 - Body ground Always 11 to 14 V

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (AIR PUMP - AI-HTR RELAY, BODY GROUND) 
    1. Remove the air pump heater relay (AI-HTR).
    2. Disconnect the air pump connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      AI-HTR relay terminal 5 - D35-1 (APH+) Always Below 1 Ω
      AI-HTR relay terminal 5 - D36-1 (APH+) Always Below 1 Ω
      D35-3 (APHG) - Body ground Always Below 1 Ω
      D36-3 (APHG) - Body ground Always Below 1 Ω
      AI-HTR relay terminal 5 or D35-1 (APH+) - Body ground Always 10 kΩ or higher
      AI-HTR relay terminal 5 or D36-1 (APH+) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. PERFORM ACTIVE TEST USING TECHSTREAM (SECONDARY AIR INJECTION SYSTEM 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 to ON and turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1: OFF, ASV1: CLOSE, AIR PUMP 2: OFF, ASV2: CLOSE.

      HINT: 

      When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

    6. Start the engine.
    7. Perform the AIR system intrusive operation while the engine is idling.
    8. Check that the air pump (AIR PUMP), ASV and pressure in the AIR system passage (PRESSURE) status displayed on the Techstream indicate the conditions shown in the table below.

      Standard

      Operation AIR PUMP ASV PRESSURE*
      AIR PUMP: ON, ASV: OPEN ON OPEN 2.4 kPa or more
      AIR PUMP: OFF, ASV: CLOSE OFF CLOSE Less than 2.4 kPa

      *: Average pumping pressure. The pressure should be 2.4 kPa or more when the AIR system operates.

    9. Turn the ignition switch off.
      NOTE:
      • This Secondary Air Injection Check only allows technicians to operate the AIR system for a maximum of 5 seconds.

        Furthermore, the check can only be performed up to 4 times per trip. If the test is repeated, intervals of at least 30 seconds are required between checks.

        While AIR system operation using the Techstream is prohibited, the Techstream display indicates the prohibition (WAIT or ERROR).

        If an ERROR is displayed on the Techstream during the test, stop the engine for 10 minutes, and then try again.

      • Performing the Secondary Air Injection Check repeatedly may cause damage to the AIR system. If necessary, leave an interval of several minutes between System Check operations to prevent the system from overheating.
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2447) 
    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 to ON and turn the Techstream on.
    5. Clear DTCs (if output) (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    6. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.
    7. Start the engine after the Techstream initialization is finished.
    8. Perform the System Check operation by pressing Next.
    9. After operating the AIR system, perform the following to confirm the AIR system pending codes: Press the Exit button.
    10. Check pending DTCs.
    11. Turn the ignition switch off.
      NOTE:
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
      RESULT

      Result Proceed to
      P2444, P2445, P2446 and/or P2447 are output A
      No pending DTC is output B

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS 

    (Refer to CHECK FOR INTERMITTENT PROBLEMS [08/2015 - 08/2018] )

    Result: 

    A 

    See step  10

  10. CHECK VACUUM HOSES (PRESSURE SENSOR - AIR SWITCHING VALVE) 
    1. Check the vacuum hose connections with the pressure sensor and ASV.
    2. Inspect the vacuum hose for blockages and damage.

      OK

      Vacuum hose has no blockages or damage.

    Result: 

    NG 

    REPAIR OR REPLACE VACUUM HOSE 

    Result: 

    OK 

    See step  11

  11. INSPECT AIR SWITCHING VALVE ASSEMBLY (PRESSURE SENSOR) 

    See step  2

    Result: 

    NG 

    REPLACE AIR SWITCHING VALVE ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  12

  12. CHECK AIR INJECTION SYSTEM PIPE CONNECTIONS 
    GTY611642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Check that all the pipes and hoses between the air pump and ASV are securely connected.
    2. Inspect the pipes and hoses for blockages and damage.

      OK

      AIR system piping has no blockages or damage.

    Result: 

    NG 

    REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING 

    Result: 

    OK 

    See step  13

  13. INSPECT AIR INJECTION CONTROL DRIVER (AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT) 
    GTY553631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D31 and D32 or D33 and D34 AID connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D32-1 (E) - Body ground Always Below 1 Ω
      D34-1 (E2) - Body ground Always Below 1 Ω
    3. Turn the ignition switch to ON.
    4. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      D31-1 (BATT) - Body ground Always 11 to 14 V (near battery voltage)
      D32-5 (+B) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)
      D33-1 (BAT2) - Body ground Always 11 to 14 V (near battery voltage)
      D34-5 (+B2) - Body ground Ignition switch ON 11 to 14 V (near battery voltage)

    Result: 

    NG 

    REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER) 
    1. Disconnect the D56 ECM connector.
    2. Disconnect the D32 or D34 AID connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D56-63 (AIRP) - D32-4 (SIP) Always Below 1 Ω
      D56-62 (ARP2) - D34-4 (SIP2) Always Below 1 Ω
      D56-63 (AIRP) or D32-4 (SIP) - body ground Always 10 kΩ or higher
      D56-62 (ARP2) or D34-4 (SIP2) - body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. INSPECT AIR PUMP 
    1. Start the engine and warm it up.
      GTY547882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch off.
    3. Connect the 400 A probe of an ammeter to the positive (+) wire of the air pump.
    4. Connect the Techstream to the DLC3.
    5. Turn the ignition switch to ON and turn the Techstream ON.
    6. Start the engine.
    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP 1: ON, ASV1: OPEN, AIR PUMP 2: ON, ASV2: OPEN and AIR PUMP 1: OFF, ASV1: CLOSE, AIR PUMP 2: OFF, ASV2: CLOSE.

      HINT: 

      When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

    8. Measure the current while the air pump is on and off.

      Standard Current

      Tester Operation Air Pump ASV Specified Condition
      AIR PUMP: ON, ASV: OPEN ON OPEN 10 to 40 A
      AIR PUMP: OFF, ASV: CLOSE OFF CLOSE Below 1 A
      NOTE:
      • This Secondary Air Injection Check only allows technicians to operate the AIR system for a maximum of 5 seconds.

        Furthermore, the check can only be performed up to 4 times per trip. If the test is repeated, intervals of at least 30 seconds are required between checks.

        While AIR system operation using the Techstream is prohibited, the Techstream display indicates the prohibition (WAIT or ERROR).

        If ERROR is displayed on the Techstream during the test, stop the engine for 10 minutes, and then try again.

      • Performing the Secondary Air Injection Check repeatedly may cause damage to the AIR system. If necessary, leave an interval of several minutes between System Check operations to prevent the system from overheating.
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.

    Result: 

    OK 

    See step  18

    Result: 

    NG 

    See step  16

  16. REPLACE AIR PUMP 
    1. Replace the air pump (Refer to REMOVAL [08/2015 - 08/2018] ).

    Result: 

    NEXT 

    See step  17

  17. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2447) 
    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 to ON and turn the Techstream on.
    5. Clear DTCs (if output) (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    6. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.
    7. Start the engine after the Techstream initialization is finished.
    8. Perform the System Check operation by pressing Next.
    9. After operating the AIR system, perform the following to confirm the AIR system pending codes: Press the Exit button.
    10. Check pending DTCs.
    11. Turn the ignition switch off.
      NOTE:
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.
      RESULT

      Result Proceed to
      No pending DTC is output A
      P2444, P2445, P2446 and/or P2447 are output B

    Result: 

    A 

    END 

    Result: 

    B 

    See step  18

  18. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Disconnect the D32 or D34 AID connector.
      GTY577113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect terminals DI and SIV or DI2 and SIV2 of the wire harness connector for the AID.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON and turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP 1: ON, ASV 1: OPEN, AIR PUMP 2: ON, ASV 2: OPEN.

      HINT: 

      When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

    6. Start the engine.
    7. Perform the AIR system forced operation while the engine is idling.
    8. Measure the voltage between the SIV and E or SIV2 and E2 terminals of the ECM connector when the AIR system is ON and OFF.
    9. Turn the ignition switch off.
      NOTE:
      • Performing Secondary Air Injection Check repeatedly may cause damage to the secondary air injection system. If it is necessary to repeat the check, leave an interval of several minutes between System Check operations to prevent the system from overheating.
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D32-3 (SIV) - D32-1 (E) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V
      D34-3 (SIV2) - D34-1 (E2) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V
      D32-3 (SIV) - D32-1 (E) AIR PUMP: OFF, ASV: CLOSE 11 to 14 V
      D34-3 (SIV2) - D34-1 (E2) AIR PUMP: OFF, ASV: CLOSE 11 to 14 V
    10. Connect terminals DI and SIP or DI2 and SIP2 of the wire harness connector for the AID.
      GTY577115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Connect the Techstream to the DLC3.
    12. Turn the ignition switch to ON and turn the Techstream on.
    13. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP 1: ON, ASV 1: OPEN, AIR PUMP 2: ON, ASV 2: OPEN.

      HINT: 

      When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

    14. Start the engine.
    15. Perform the AIR system forced operation while the engine is idling.
    16. Measure the voltage between the SIP and E or SIP2 and E2 terminals of the ECM connector when the AIR system is ON and OFF.
    17. Turn the ignition switch off.
      NOTE:
      • Performing Secondary Air Injection Check repeatedly may cause damage to the secondary air injection system. If it is necessary to repeat the check, leave an interval of several minutes between System Check operations to prevent the system from overheating.
      • When performing the Secondary Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch ON or the engine running.
      • Turn the ignition switch off when the Secondary Air Injection Check operation finishes.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D32-4 (SIP) - D32-1 (E) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V
      D34-4 (SIP2) - D34-1 (E2) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V
      D32-4 (SIP) - D32-1 (E) AIR PUMP: OFF, ASV: CLOSE 11 to 14 V
      D34-4 (SIP2) - D34-1 (E2) AIR PUMP: OFF, ASV: CLOSE 11 to 14 V

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  19

  19. REPLACE AIR INJECTION CONTROL DRIVER 
    1. Replace the air injection control driver (Refer to REMOVAL [08/2015 - 08/2018] ).

    Result: 

    NEXT 

    See step  20

  20. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444, P2445, P2446 AND/OR P2447) 
    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 to ON and turn the Techstream on.
    5. Clear DTCs (if output) (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    6. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.
    7. Start the engine after the Techstream initialization is finished.
    8. Perform the System Check operation by pressing Next.
    9. After operating the AIR system, perform the following to confirm the AIR system pending codes: Press the Exit button.
    10. Check pending DTCs.
    11. Turn the ignition switch off.

      OK

      No pending DTC is output.

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

    Result: 

    OK 

    END 

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

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