SFI SYSTEM, Diagnostic DTC:P2A00

DTC Code DTC Name
P2A00 A/F Sensor Circuit Slow Response (Bank 1 Sensor 1)

DESCRIPTION

Tip:

Refer to DTC P2195 (Click here).

DTC No.

DTC Detection Condition

Trouble Area

P2A00

Calculated value for air fuel ratio sensor response rate deterioration level is less than threshold (2 trip detection logic).

  • Air fuel ratio sensor (sensor 1)

  • Air fuel ratio sensor heater (sensor 1)

  • Intake system

  • Fuel injector assembly

  • Fuel pump

  • Fuel line

  • ECM

CONFIRMATION DRIVING PATTERN

Tip:

Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.

A231470E65

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the GTS on.

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

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

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

  7. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

  8. Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more in a city area [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending [C].

  10. Read the pending DTCs.

    Tip:

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

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

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P2A00.

  13. 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
    Tip:

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

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

    • If the test result is INCOMPLETE or N/A and no pending DTC is output, perform the following procedure.

  14. Drive the vehicle at a speed between 75 and 100 km/h (47 and 63 mph) for 10 minutes [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending [E].

  16. Read the pending DTCs.

    Tip:

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

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

  17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  18. Input the DTC: P2A00.

  19. 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
    Tip:

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

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

    • If the judgment result shows INCOMPLETE or N/A, drive the vehicle again under an increased load and then recheck the judgment result.

WIRING DIAGRAM

Refer to DTC P2195 (Click here).

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

  • DTC P2A00 may be also stored, when the air fuel ratio is stuck rich or lean.

  • A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.

  • A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A00)

    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 the DTCs.

    Table 1. Result

    Result

    Proceed to

    DTC P2A00 is output

    A

    DTC P2A00 and other DTCs are output

    B
    Tip:

    If any DTCs other than P2A00 are output, troubleshoot those DTCs first.

    GO TO DTC CHART

    (Click here)

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Warm up the engine and run the engine at an engine speed of 2500 rpm for approximately 90 seconds.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Data List / AFS Voltage B1S1 and O2S B1S2.

    6. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

    7. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the GTS.

      Tip:

      • Change the fuel injection volume within the range of - 12.5% to 12.5%.

      • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

      • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

      GTS Display (Sensor)

      Injection Volume

      Status

      Voltage

      AFS Voltage B1S1

      (Air fuel ratio)

      12.5%

      Rich

      Below 3.1 V

      AFS Voltage B1S1

      (Air fuel ratio)

      -12.5%

      Lean

      Higher than 3.4 V

      O2S B1S2

      (Heated oxygen)

      12.5%

      Rich

      Higher than 0.55 V

      O2S B1S2

      (Heated oxygen)

      -12.5%

      Lean

      Below 0.4 V

      Result

      Status of AFS Voltage B1S1

      Status of O2S B1S2

      Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition

      Proceed to

      Lean/Rich

      Lean/Rich

      Normal

      A

      Lean

      Lean

      Actual air fuel ratio lean

      B

      Rich

      Rich

      Actual air fuel ratio rich

      B

      Lean

      Lean/Rich

      Air fuel ratio sensor malfunction

      C

      Rich

      Lean/Rich

      Air fuel ratio sensor malfunction

      C

      Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V.

      Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V.

      Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output voltage of the heated oxygen sensor alternates correctly.

    INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)Click here

    REPLACE AIR FUEL RATIO SENSORClick here

  3. CHECK WHETHER DTC OUTPUT RECURS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs (Click here).

    5. Turn the ignition switch off and wait for 30 seconds.

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

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    10. Input the DTC: P2A00.

    11. Check the DTC judgment result.

      Table 2. Result

      Result

      Proceed to

      NORMAL (DTC is not output)

      A

      ABNORMAL (DTC P2A00 is output)

      B

    CHECK FOR INTERMITTENT PROBLEMS

    (Click here)

    REPLACE AIR FUEL RATIO SENSORClick here

  4. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

    1. Inspect the air fuel ratio sensor (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (Click here).

    REPLACE AIR FUEL RATIO SENSOR

    (Click here)

  5. CHECK INTAKE SYSTEM

    1. Check the intake system (Click here).

      Tip:

      Perform "Inspection After Repair" after repairing or replacing the intake system (Click here).

    REPAIR OR REPLACE INTAKE SYSTEM

  6. CHECK FUEL PRESSURE

    1. Check the fuel pressure (Click here).

    INSPECT FUEL PUMPClick here

  7. INSPECT FUEL INJECTOR ASSEMBLY

    1. Inspect the fuel injector assembly (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Click here).

    REPLACE FUEL INJECTOR ASSEMBLY

    (Click here)

  8. REPLACE AIR FUEL RATIO SENSOR

    1. Replace the air fuel ratio sensor (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (Click here).

  9. CHECK WHETHER DTC OUTPUT RECURS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs (Click here).

    5. Turn the ignition switch off and wait for 30 seconds.

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

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    10. Input the DTC: P2A00.

    11. Check the DTC judgment result.

      Table 3. Result

      Result

      Proceed to

      ABNORMAL (DTC P2A00 is output)

      A

      NORMAL (DTC is not output)

      B

    END

  10. REPLACE ECM

    1. Replace the ECM (Click here).

  11. CHECK WHETHER DTC OUTPUT RECURS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs (Click here).

    5. Turn the ignition switch off and wait for 30 seconds.

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

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    10. Input the DTC: P2A00.

    11. Check that the DTC judgment result is NORMAL.

    END

  12. INSPECT FUEL PUMP

    1. Inspect the fuel pump (Click here).

      Tip:

      Perform "Inspection After Repair" after replacing the fuel pump (Click here).

    REPAIR OR REPLACE FUEL LINE

    REPLACE FUEL PUMP

    (Click hereClick here)