SFI SYSTEM, Diagnostic DTC:P0418, P0419

DTC Code DTC Name
P0418 Secondary Air Injection System Control "A" Circuit
P0419 Secondary Air Injection System Control "B" Circuit

DESCRIPTION

Refer to DTC P0412 Click here.

DTC Code DTC Detection Condition Trouble Area

P0418

P0419

  • After a cold engine start, all of the following conditions are met (2 trip detection logic):


    1. Secondary Air Injection (AIR) system not operating (air pump OFF, Air Switching Valve [ASV] OFF)

    2. The diagnostic signal from the Air Injection Control Driver (AID) is 20%.

    3. The battery voltage is 8 V or higher.

  • Open in air pump drive circuit

  • Air pump

  • Air injection control driver (AID)

  • ECM

P0418

P0419

  • After a cold engine start, all of the following conditions are met (2 trip detection logic):


    1. The Secondary Air Injection (AIR) system is operating (air pump ON, Air Switching Valve [ASV] ON).

    2. The diagnostic signal from the Air Injection Control Driver (AID) is 20%.

    3. The battery voltage is 8 V or higher.

  • Short between air pump drive circuit and body ground

  • Air pump

  • Air injection control driver (AID)

  • ECM

MONITOR DESCRIPTION

The Air Injection Control Driver (AID) detects open and short circuits according to the voltages of the air pump terminal (VP) and the Air Switching Valve (ASV) terminal (VV), and transmits diagnostic information as a signal to the ECM.

For a short time after a cold engine start, the ECM transmits command signals to the AID to drive the air pump and ASV.

The AID transmits an air pump malfunction signal to the ECM if either of the following conditions is met:


The ECM stores the DTC based on diagnostic signals from the AID.

WIRING DIAGRAM

Refer to DTC P0412 Click here.

CAUTION / NOTICE / HINT

Tech Tips


  • By using the GTS to perform the Secondary Air Injection Check operation in the Utility, 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.

  • Read freeze frame data using the GTS. 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 HARNESS AND CONNECTOR (AIR PUMP - AIR INJECTION CONTROL DRIVER, BODY GROUND)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the cable from the positive (+) battery terminal.

    3. Disconnect the air pump connector.

    4. Disconnect the AID connector.

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

      Standard Resistance
      with Air Pump Heater
      Tester Connection Condition Specified Condition
      C70-2 (B) - C29-2 (VP) Always Below 1 Ω
      C71-2 (+B) - C31-2 (VP2) Always Below 1 Ω
      C29-1 (BATT) - Battery positive (+) terminal Always Below 1 Ω
      C31-1 (BAT2) - Battery positive (+) terminal Always Below 1 Ω
      C70-4 (E) - Body ground Always Below 1 Ω
      C71-4 (GND) - Body ground Always Below 1 Ω
      C70-2 or C29-2 (VP) - Body ground Always 10 kΩ or higher
      C71-2 or C31-2 (VP2) - Body ground Always 10 kΩ or higher
      C29-1 (BATT) or Battery positive (+) terminal - Body ground Always 10 kΩ or higher
      C31-1 (BAT2) or Battery positive (+) terminal - Body ground Always 10 kΩ or higher
      without Air Pump Heater
      Tester Connection Condition Specified Condition
      C33-2 (B) - C29-2 (VP) Always Below 1 Ω
      C34-2 (+B) - C31-2 (VP2) Always Below 1 Ω
      C29-1 (BATT) - Battery positive (+) terminal Always Below 1 Ω
      C31-1 (BAT2) - Battery positive (+) terminal Always Below 1 Ω
      C33-1 (E) - Body ground Always Below 1 Ω
      C34-1 (GND) - Body ground Always Below 1 Ω
      C33-2 or C29-2 (VP) - Body ground Always 10 kΩ or higher
      C34-2 or C31-2 (VP2) - Body ground Always 10 kΩ or higher
      C29-1 (BATT) or Battery positive (+) terminal - Body ground Always 10 kΩ or higher
      C31-1 (BAT2) or Battery positive (+) terminal - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT AIR PUMP


    1. B0018BYE01
      *1 for Bank 1:
      *2 for Bank 2:

      Start the engine and warm it up.

    2. Turn the engine switch off.

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

    4. Connect the GTS to the DLC3.

    5. Turn the engine switch on (IG) and turn the GTS 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.

      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.

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

      Standard Current
      GTS 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 GTS is prohibited, the GTS display indicates the prohibition (WAIT or ERROR).

        If 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 engine switch turned on (IG) or the engine running.

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


    OK

    REPLACE AIR INJECTION CONTROL DRIVER Click here

    NG

  3. REPLACE AIR PUMP ASSEMBLY


    1. Replace the air pump assembly Click here.


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS


    1. Start the engine and warm it up.

    2. Turn the engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG) and turn the GTS on.

    5. Clear the DTCs (if set) Click here.

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

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

    8. Perform the System Air Injection 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 DTCs.

    11. Turn the engine switch off.

      OK
      No 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 engine switch turned on (IG) or the engine running.

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


    OK

    END

    NG

    REPLACE AIR INJECTION CONTROL DRIVER Click here