SFI SYSTEM(w/o EGR System), Diagnostic DTC:P2431,P2432,P2433,P2436,P2437 and P2438

DTC Code DTC Name
P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2432 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank1
P2433 Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank1
P2436 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank 2
P2437 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank 2
P2438 Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank 2

DESCRIPTION

Refer to DTC P0412 (Click here).

Refer to DTC P0416 (Click here).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

Memory

P2431

Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1

Pressure sensor indicates a value below 45.6 kPa (342 mmHg), or higher than 135 kPa (1013 mmHg) (2 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

P2432

Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank1

While the engine is running, the voltage output of the pressure sensor is below 0.5 V (1 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

P2433

Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank1

While the engine is running, the voltage output of the pressure sensor is higher than 4.5 V (1 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

P2436

Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank 2

Pressure sensor indicates a value below 45.6 kPa (342 mmHg), or higher than 135 kPa (1013 mmHg) (2 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

P2437

Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank 2

While the engine is running, the voltage output of the pressure sensor is below 0.5 V (1 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

P2438

Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank 2

While the engine is running, the voltage output of the pressure sensor is higher than 4.5 V (1 trip detection logic).

  • Pressure sensor

  • Open or short in pressure sensor circuit

  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

A085160E19

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the air switching valve in the secondary air injection system. Using this pressure value, the ECM determines whether the secondary air injection system is malfunctioning or not.

If there is a defect in the sensor or the sensor circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the pressure sensor or circuit and stores a DTC.

CONFIRMATION DRIVING PATTERN

Note:

  • This 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 prohibited, the intelligent tester display indicates the 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 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 Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the engine switch turned on (IG) or the engine running.

  • Turn the engine switch off when the Air Injection Check operation finishes.

  1. Start the engine and warm it up.

  2. Turn the engine switch off.

  3. Connect the intelligent tester to the DLC3.

  4. Turn the engine switch on (IG).

  5. Turn the tester on.

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

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

  8. Turn the engine switch on (IG) and turn the tester on.

  9. Enter the following menus: Powertrain / Engine and ECT / Utility / Air injection check / Automatic Mode.

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

  11. Perform the System Check operation by pressing ENTER (Next).

  12. Perform the following to confirm the AIR system pending codes: Press ENTER (Exit).

  13. Check for pending DTCs.

    OK

    No pending DTC is output.

  14. After "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: P2431, P2432, P2433, P2436, P2437 or P2438.

  16. Check the DTC judgment result.

    Tester 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

    UNKNOWN

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

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

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

  17. Turn the engine switch off.

WIRING DIAGRAM

A162276E07

CAUTION / NOTICE / HINT

Tip:

  • Refer to "Data List / Active Test" [Air Pump Pressure (Absolute) and Air Pump2 Pressure (Absolute)] (Click here).

  • 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.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - ECM)

    1. Disconnect the air switching valve connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      C35-2 (AIP) - G44-1 (AIP)

      Always

      Below 1 Ω

      C35-1 (VC) - C28-16 (VCV2)

      Always

      Below 1 Ω

      C35-3 (E2) - C29-7 (E2)

      Always

      Below 1 Ω

      C36-2 (AIP2) - G44-2 (AIP2)

      Always

      Below 1 Ω

      C36-1 (VC2) - C28-16 (VCV2)

      Always

      Below 1 Ω

      C36-3 (E22) - C29-7 (E2)

      Always

      Below 1 Ω

      C35-2 (AIP) or G44-1 (AIP) - Body ground

      Always

      10 kΩ or higher

      C35-1 (VC) or C28-16 (VCV2) - Body ground

      Always

      10 kΩ or higher

      C36-2 (AIP2) or G44-1 (AIP2) - Body ground

      Always

      10 kΩ or higher

      C36-1 (VC2) or C28-16 (VCV2) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK TERMINAL VOLTAGE (VC OF AIR SWITCHING VALVE)

    1. A219201C01

      *A

      Bank 1

      *B

      Bank 2

      *a

      Front view of wire harness connector

      (to Air Switching Valve Assembly)

      Disconnect the air switching valve connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      C35-1 (VC) - C35-3 (E2)

      Engine switch on (IG)

      4.5 to 5.5 V

      C36-1 (VC2) - C36-3 (E22)

      Engine switch on (IG)

      4.5 to 5.5 V

      Result

      Result

      OK

      NG
    NG

    REPLACE ECM

    Click here

    OK

  3. REPLACE AIR SWITCHING VALVE ASSEMBLY

    1. Replace the air switching valve assembly.

      Tip:

      • Replace the air switching valve assembly for bank 1.

        Click here

      • Replace the air switching valve assembly for bank 2.

        Click here

      Result

      Result

      NEXT
    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS

    1. Perform the Confirmation Driving Pattern.

      Powertrain > Engine and ECT > Trouble Codes

      Result

      Result

      Proceed to

      NORMAL

      (No DTC output)

      A

      ABNORMAL

      (P2431, P2432, P2433, P2436, P2437 or P2438 output)

      B
    A

    END

    B

    REPLACE ECM

    Click here