SFI SYSTEM, Diagnostic DTC:P2440, P2441

DESCRIPTION

Refer to DTC P2431 Click here.

MONITOR DESCRIPTION

Air Switching Valve of the Secondary Air Injection system.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the secondary Air Injection system, and illuminates the MIL and stores a DTC:

• Exhaust gas pulsation is detected by the air pressure sensor despite the ECM commanding the Air Switching Valve to close.

• Exhaust gas pulsation is not detected by the air pressure sensor despite the ECM commanding the Air Switching Valve to open.

MONITOR STRATEGY

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

1. Start the engine and warm it up.

2. Turn the ignition switch off.

3. Connect the GTS to the DLC3.

4. Turn the ignition switch to ON.

5. Turn the GTS on.

6. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

7. Turn the ignition switch off and wait for at least 30 seconds.

8. Turn the ignition switch to ON and turn the GTS on.

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

10. Start the engine after the GTS initialization is finished.

11. Perform the System Check operation by pressing Next.

12. Perform the following to confirm the secondary air injection system pending DTCs: Press the Exit.

13. Check for pending DTCs.

    Tech Tips

    
    

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

14. After the "Air injection check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

15. Input the DTC: P2440 or P2441.

16. Check the DTC judgment result.

    GTS Display	Description
    NORMAL	DTC judgment completed System normal
    ABNORMAL	DTC judgment completed System abnormal
    INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips

    
    

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

17. Turn the ignition switch off.

WIRING DIAGRAM

Refer to the following pages.

• Secondary air injection system air pressure sensor circuit Click here.

• Secondary air injection system air switching valve circuit Click here.

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR INJECTION SYSTEM DTCS)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON.

   3. Turn the GTS on.

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

   5. Read DTCs.

      Result

      Result	Proceed to
      DTC P2440 and/or P2441 is output (for w/ air pump heater)	A
      DTC P2440 and/or P2441 is output (for w/o air pump heater)	B
      DTC P2440 and/or P2441, and P0412 are output	C
      DTC P2440 and/or P2441, and other DTCs (except P0412) are output	D

      If any DTCs other than P2440 and/or P2441 are output, troubleshoot those DTCs first.

   
   

   B

   INSPECT AIR PUMP ASSEMBLY Click here

   C

   GO TO AIR SWITCHING VALVE INSPECTION PROCEDURE Click here

   D

   GO TO DTC CHART Click here

   A

2. CHECK FREEZE FRAME DATA (AIR PUMP FREEZE AND AIR SWITCHING VALVE FREEZE)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the ignition switch to ON and turn the GTS on.

   3. Read the values of Air Pump Freeze and Air Switching Valve 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 Switching Valve Freeze
      OFF	OFF	B
      Except above		A

   
   

   B

   INSPECT AIR PUMP ASSEMBLY Click here

   A

3. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE AIR PUMP HEATER)

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Air Pump Assembly)

      Disconnect the air pump connector.

   2. Connect the GTS to the DLC3.

   3. Turn the ignition switch to ON and turn the GTS 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 A18-1 (APH+) - Body ground Activate the Air Pump Heater is ON 11 to 14 V

   
   

   NG

   INSPECT NO. 1 INTEGRATION RELAY (AIR PMP HTR RELAY) Click here

   OK

4. INSPECT AIR PUMP ASSEMBLY (HEATER RESISTANCE)

   
   

   1. Inspect the air pump assembly Click here.

   
   

   NG

   REPLACE AIR PUMP ASSEMBLY

   OK

5. INSPECT NO. 1 INTEGRATION RELAY (AIR PMP HTR RELAY)

   
   

   1. Inspect the No. 1 integration relay (AIR PMP HTR relay) Click here.

   
   

   NG

   REPLACE NO. 1 INTEGRATION RELAY (AIR PMP HTR)

   OK

6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AIR PUMP)

   
   

   1. Remove the No. 1 integration relay from the engine room relay block and junction block assembly.

   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 1T-12 - A18-1 (APH+) Always Below 1 Ω A18-3 (APHG) - Body ground Always Below 1 Ω 1T-12 or A18-1 (APH+) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

7. INSPECT AIR PUMP ASSEMBLY

   
   

   1. Inspect the air pump assembly Click here.

   
   

   NG

   REPLACE AIR PUMP ASSEMBLY Click here

   OK

8. PERFORM ACTIVE TEST USING GTS (SECONDARY AIR INJECTION SYSTEM OPERATION)

   

   
   

   1. Perform a visual check

      
      

      1. Start the engine and warm it up.

      2. Turn the ignition switch off.

      3. Disconnect the air hose No. 6.

      4. Connect the GTS to the DLC3.

      5. Turn the ignition switch to ON and turn the GTS on.

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

         Tech Tips

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

      7. Start the engine.

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

      9. Place your hand near the air switching valve port and check that the exhaust gas pressure pulsates when the ASV is turned on.

         CAUTION:

         To avoid the danger of being burned by the exhaust gas, bring your hand close to the valve port slowly.

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

      11. Check that the exhaust gas does not pulsate when the ASV is turned off.

      12. 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 Secondary Air Injection system operation using the GTS is prohibited, the GTS display indicates the prohibition (Wait or Error).

            If an Error is displayed on the GTS 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.

          OK
          Air Pump Operation ASV Operation Exhaust Gas Pulsation ON OFF Not detected ON ON Detected

      13. Reconnect the air hose No. 6.

   2. Other inspection method:

      The air switching valve operation can be confirmed by checking the cumulative pressure pulsation^*provided in the System Check.

      Perform System Check operation under Manual Mode.

      ^*: The exhaust pulsation value is calculated in the ECM. If the calculated value exceeds a certain level, the ECM determines that the exhaust pulsation is in the secondary air injection system.

      
      

      1. Start the engine and warm it up.

      2. Turn the ignition switch off.

      3. Connect the GTS to the DLC3.

      4. Turn the ignition switch to ON and turn the GTS on.

      5. 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.

      6. Start the engine after the GTS initialization is finished.

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

      8. Check that the air-fuel ratio and pressure in the secondary air injection system passage (PULSATION) displayed on the GTS, indicate the conditions shown in the table below.

      9. Turn the ignition switch off.

         Standard
         Secondary Air Injection System Operation Pulsation Condition (ECM Calculation) Air-Fuel Ratio (Reference) AIR PUMP: ON, ASV: OPEN 10 kPa or more 18 or more AIR PUMP: OFF, ASV: CLOSE Less than 10 kPa Approximately 14.5 (around stoichiometric air-fuel ratio)

         Result

         Result	Proceed to
         NG	A
         OK	B

         Tech Tips

         REFERENCE:

         If the air pump operation is confirmed as normal Click here, the air-fuel ratio detected in front of three-way catalytic converter changes in response to the secondary air pumped into the exhaust port when the air pump operates.

   
   

   B

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

   A

9. INSPECT NO. 4 INTAKE PIPE (BLOCKAGES AND LEAKAGES)

   

   Text in Illustration

   *1	NO.4 Intake Pipe

   
   

   1. Check that the No. 4 intake pipe is securely connected to both the exhaust manifold and the air switching valve

   2. Inspect the No. 4 intake pipe for blockages and damage.

      OK
      No blockages or damage on No. 4 intake pipe.

   
   

   NG

   REPLACE NO. 4 INTAKE PIPE

   OK

10. INSPECT AIR SWITCHING VALVE ASSEMBLY (AIR SWITCHING VALVE OPERATION)

    
    

    1. Inspect the air switching valve assembly Click here.

    
    

    NG

    REPLACE AIR SWITCHING VALVE ASSEMBLY Click here

    OK

11. INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE OF AIR INJECTION CONTROL DRIVER)

    

    Text in Illustration

    *a	Front view of wire harness connector (to Air Injection Control 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 A17-1 (BATT) - Body ground Always 11 to 14 V A16-5 (+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
       Tester Connection Condition Specified Condition A16-1 (E) - Body ground Always Below 1 Ω

    
    

    NG

    REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT

    OK

12. 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
       Tester Connection Condition Specified Condition G180-5 (AIRV) - A16-3 (SIV) Always Below 1 Ω G180-5 (AIRV) or A16-3 (SIV) - Body ground Always 10 kΩ or higher

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

13. PERFORM ACTIVE TEST USING GTS

    
    

    1. Disconnect the air injection control driver connector.

    2. 

       Text in Illustration

       *1	Air Injection Control Driver
       *2	ECM
       *a	Front view of wire harness connector (to Air Injection Control Driver)

       Connect terminals DI and SIV of the wire harness connector for the air injection control driver.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

       Tech Tips

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

    7. Start the engine.

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

    9. Measure the voltage between the SIV and E terminals of the ECM connector when the secondary air injection system is on and off.

    10. Turn the ignition switch off.

        Note

        
        

        • Do not perform the System Check operation repetitively. It may cause the damage in the system. If necessary, leave an interval of several minutes between System Check operations.

        • 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 A16-3 (SIV) - A16-1 (E) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V AIR PUMP: OFF, ASV: CLOSE 11 to 14 V

    11. 

        Text in Illustration

        *1	Air Injection Control Driver
        *2	ECM
        *a	Front view of wire harness connector (to Air Injection Control Driver)

        Connect terminals DI and SIP of the wire harness connector for the air injection control driver.

    12. Connect the GTS to the DLC3.

    13. Turn the ignition switch to ON.

    14. Turn the GTS on.

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

        Tech Tips

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

    16. Start the engine.

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

    18. Measure the voltage between the SIP and E terminals of the ECM connector when the secondary air injection system is on and off.

    19. Turn the ignition switch off.

        Note

        
        

        • Do not perform the System Check operation repetitively. It may cause the damage in the system. If necessary, leave an interval of several minutes between System Check operations.

        • 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 A16-4 (SIP) - A16-1 (E) AIR PUMP: ON, ASV: OPEN 0.5 to 2 V AIR PUMP: OFF, ASV: CLOSE 11 to 14 V

    
    

    NG

    REPLACE ECM Click here

    OK

14. REPLACE AIR INJECTION CONTROL DRIVER

    
    

    1. Replace the air injection control driver.

    
    

    NEXT

15. CHECK WHETHER DTC OUTPUT RECURS (DTC P2440 AND/OR P2441)

    
    

    1. Start the engine and warm it up.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Clear DTCs (if stored) Click here.

    7. Turn the ignition switch off and wait for at least 30 seconds.

    8. Turn the ignition switch to ON.

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

    10. Start the engine after the GTS initialization is finished.

    11. Perform the System Check operation by pressing Next.

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

    13. Check pending DTCs.

    14. 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.

    
    

    OK

    END

    NG

    REPLACE ECM Click here

16. INSPECT VACUUM HOSES (AIR SWITCHING VALVE - AIR PRESSURE SENSOR)

    OK
    No blockage and no deformation in vacuum hose.

    
    

    NG

    REPAIR OR REPLACE VACUUM HOSE

    OK

17. INSPECT AIR PRESSURE SENSOR

    
    

    1. 

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

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

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

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

       Tech Tips

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

    
    

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPLACE AIR PRESSURE SENSOR