SFI SYSTEM (w/ Secondary Air Injection System), Diagnostic DTC:P2444, P2445

DTC Code DTC Name
P2444 Secondary Air Injection System Pump Stuck On Bank1
P2445 Secondary Air Injection System Pump Stuck Off Bank1

DESCRIPTION

Refer to P2431 Click here.

DTC No. DTC Detection Condition Trouble Area
P2444 Secondary air pressure more than 3.3 kPa (25 mmHg) despite ECM commanding air pump to turn off (2 trip detection logic)

  • Short in air pump circuit

  • Open or short in air pressure sensor circuit

  • Air pressure sensor

  • Air injection control driver

  • ECM
P2445 Secondary air pressure less than 1.0 kPa (7.5 mmHg) despite ECM commanding air pump to turn on (2 trip detection logic)

  • Air pump

  • Open in air pump circuit

  • Air injection system piping

  • Vacuum hose (air pressure sensor - air switching valve)

  • Air pressure sensor

  • Open or short in air pressure sensor circuit

  • Air injection control driver

  • ECM

MONITOR DESCRIPTION

The ECM monitors the pressure in the secondary air passage using the air pressure sensor located on the air switching valve of the secondary air injection system. The sensor measures the pressure in the secondary air passage and transmits a signal to the ECM.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the air injection system, and illuminates the MIL and sets a DTC:


WIRING DIAGRAM

Refer to DTC P0412 Click here.

INSPECTION PROCEDURE

Tech Tips


  • By using the intelligent tester to perform the Secondary Air Injection Check operation in the System Check, the air-fuel ratio and the pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions. Furthermore, Pending Codes also can be checked by performing System Check / Automatic Mode after the repair.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444 AND/OR P2445)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read DTCs.

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

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


    B

    GO TO AIR PUMP INSPECTION PROCEDURE

    C

    GO TO DTC CHART

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SECONDARY AIR INJECTION SYSTEM OPERATION)


    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP: ON, ASV: OPEN and AIR PUMP: OFF, ASV: CLOSE.

      Tech Tips

      When Manual Mode is selected, the intelligent tester initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and air switching valve operation can be selected.

    7. Start the engine.

    8. Perform the air injection system intrusive operation while the engine is idling.

    9. A01BBIVE79
      Text in Illustration
      *a

      Component with wire harness connected

      (ECM)

      Check that the air pump (AIR PUMP), air switching valve (ASV) and pressure in the air injection system passage (PRESSURE) status displayed on the intelligent tester, indicate the conditions shown in the table below.

      Tech Tips

      At the same time, also measure the voltage according to the value(s) in the table below.

      Standard
      Tester Operation AIR PUMP ASV PRESSURE* Tester Connection Specified Condition
      AIR PUMP: ON, ASV: OPEN ON ON 1 kPa or more D1-11 (AIRP) - D1-3 (E1) 3.5 to 7.5 V
      AIR PUMP: OFF, ASV: CLOSE OFF OFF Less than 3.3 kPa D1-11 (AIRP) - D1-3 (E1) 10 V or more

      *: Average pumping pressure. The pressure should be 1 kPa or more when the air injection system operates.

    10. Turn the ignition switch off.

      Note


      • This Secondary Air Injection Check only allows technicians to operate the air injection 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 injection system operation using the intelligent tester is prohibited, the intelligent tester display indicates the prohibition (Wait or Error).

        If an Error is displayed on the intelligent tester 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 injection 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.


    NG

    CHECK VACUUM HOSES (AIR PRESSURE SENSOR - AIR SWITCHING VALVE) Click here

    OK

  3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 AND/OR P2445)


    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Clear DTCs (if set) Click here.

    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.

    8. Start the engine after the intelligent tester initialization is finished.

    9. Perform the System Check operation by pressing Next.

    10. After operating the air injection system, perform the following to confirm the air injection system pending codes: Press the Exit button.

    11. Check pending DTCs.

    12. 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
      DTC P2444 and/or P2445 is output A
      No pending DTC B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

  4. CHECK VACUUM HOSES (AIR PRESSURE SENSOR - AIR SWITCHING VALVE)


    1. Check the vacuum hose connections with the air pressure sensor and air switching valve.

    2. Inspect the vacuum hose for blockages and damage.

      OK
      Vacuum hose has no blockages or damage.

    NG

    REPAIR OR REPLACE VACUUM HOSE

    OK

  5. INSPECT AIR PRESSURE SENSOR


    1. A01BDJ3

      Connect a pressure gauge to the air pressure sensor as shown in the illustration.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Air Pump Pressure (Absolute).

    6. Check that the pressure displayed on the intelligent tester fluctuates when applying the pressure to the air pressure sensor with the pressure gauge.

      OK
      Pressure fluctuates in response to pressure applied with pressure gauge.

      Tech Tips

      The intelligent tester displays the air pump pressure (Air Pump Pressure (Absolute) as absolute pressure.


    NG

    REPLACE AIR PRESSURE SENSOR

    OK

  6. CHECK AIR INJECTION SYSTEM PIPE CONNECTIONS

    A01BETG

    1. Check that all the pipes and hoses between the air pump and air switching valve are securely connected.

    2. Inspect the pipes and hoses for blockages and damage.

      OK
      Air injection system piping has no blockages or damage.

    NG

    REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING

    OK

  7. INSPECT AIR INJECTION CONTROL DRIVER (AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT)

    A01BFWEE07
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Air Injection Driver)

    1. Disconnect the air injection control driver connectors.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B14-1 (BATT) - Body ground Always 11 to 14 V
      B12-5 (+B) - Body ground Ignition Switch ON 11 to 14 V

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B12-1 (E) - Body ground Always Below 1 Ω

    5. Reconnect the air injection control driver connectors.


    NG

    REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT

    OK

  8. CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)


    1. Disconnect the ECM connector.

    2. Disconnect the air injection control driver connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D1-11 (AIRP) - B12-4 (SIP) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D1-11 (AIRP) or B12-4 (SIP) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM.

    5. Reconnect the air injection control driver connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT AIR PUMP ASSEMBLY

    A01BCLEE02
    Text in Illustration
    *1 Air Pump Wire
    *2 Air Injection Control Driver

    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the 400 A probe of an ammeter to the (+) wire of the air pump.

    4. Connect the intelligent tester to the DLC3.

    5. Turn the ignition switch to ON.

    6. Turn the tester on.

    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP: ON, ASV: OPEN and AIR PUMP: OFF, ASV: CLOSE.

      Tech Tips

      When Manual Mode is selected, the intelligent tester 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 intelligent tester is prohibition (WAIT or ERROR).

        If ERROR is displayed on the intelligent tester 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.


    NG

    REPLACE AIR PUMP ASSEMBLY Click here

    OK

  10. REPLACE AIR INJECTION CONTROL DRIVER


    1. Replace the air injection control driver.


    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 AND/OR P2445)


    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Clear DTCs (if set) Click here.

    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.

    8. Start the engine after the intelligent tester initialization is finished.

    9. Perform the System Check operation by pressing Next.

    10. After operating the air injection system, perform the following to confirm the air injection system pending codes: Press the Exit button.

    11. Check pending DTCs.

    12. Turn the ignition switch off.

      OK
      No pending DTC 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.


    NEXT

    END

  12. REPLACE AIR PUMP ASSEMBLY


    1. Replace the air pump assembly.


    NEXT

  13. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 AND/OR P2445)


    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Clear DTCs (if set) Click here.

    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.

    8. Start the engine after the intelligent tester initialization is finished.

    9. Perform the System Check operation by pressing Next.

    10. After operating the air injection system, perform the following to confirm the air injection system pending codes: Press the Exit button.

    11. Check pending DTCs.

    12. Turn the ignition switch off.

      OK
      No pending DTC 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.


    NG

    REPLACE AIR INJECTION CONTROL DRIVER Click here

    OK

    END

  14. REPLACE AIR INJECTION CONTROL DRIVER


    1. Replace the air injection control driver.


    NEXT

  15. CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 AND/OR P2445)


    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the tester on.

    6. Clear DTCs (if set) Click here.

    7. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.

    8. Start the engine after the intelligent tester initialization is finished.

    9. Perform the System Check operation by pressing Next.

    10. After operating the air injection system, perform the following to confirm the air injection system pending codes: Press the Exit button.

    11. Check pending DTCs.

    12. Turn the ignition switch off.

      OK
      No pending DTC 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.


    NEXT

    END