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Home >> Nissan-Datsun >> 2023 >> Z Performance, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (5 Of 6) >> DTC/Circuit Diagnosis >> DTC P2270: O2 Sensor >> DTC Description
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DTC Description

The heated oxygen sensor 2 has a much longer switching time between rich and lean than the air fuel ratio (A/F) sensor 1. The oxygen storage capacity of the three way catalyst 1 causes the longer switching time.

MALFUNCTION A: To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the voltage is unusually high during various driving conditions such as fuel cut.

GNSDB108293Courtesy of NISSAN NORTH AMERICA, INC.

MALFUNCTION B: To judge malfunctions of heated oxygen sensor 2, ECM monitors whether the minimum voltage of sensor is sufficiently low during various driving conditions such as fuel cut.

GNSDB107660Courtesy of NISSAN NORTH AMERICA, INC.

DTC DETECTION LOGIC 

DTC CONSULT screen terms (Trouble diagnosis content) DTC detection condition
P2270 O2 sensor signal bank 1 sensor 2 (O2 sensor signal biased/stuck lean bank 1 sensor 2) A Diagnosis condition -
Signal (terminal) Heated oxygen sensor 2 (bank 1) signal
Threshold An excessively high voltage from the sensor is sent to ECM
Diagnosis delay time -
B Diagnosis condition -
Signal (terminal) Heated oxygen sensor 2 (bank 1) signal
Threshold The minimum voltage from the sensor is not reached to the specified voltage
Diagnosis delay time -

POSSIBLE CAUSE 

DTC P2270 - A

DTC P2270 - B

FAIL-SAFE 

Not applicable

DTC CONFIRMATION PROCEDURE 

  1. PRECONDITIONING 

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A 
    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Turn ignition switch ON.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
    6. Let engine idle for 2 minutes.
    7. Check 1st trip DTC.

    Is DTC P2270 detected?

    YES>>

    Refer to DTC Diagnosis Procedure .

    NO-1>>

    With CONSULT : GO TO 3.

    NO-2>>

    Without CONSULT : GO TO 5.

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B 
    NOTE: SYMBOL For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30 °C (32 to 86 °F).

    SYMBOL With CONSULT

    1. Turn ignition ON.
    2. On CONSULT screen, select "ENGINE">>"Data Monitor"
    3. Start engine and warm it up to the normal operating temperature.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Turn ignition switch ON.
    6. Turn ignition switch OFF and wait at least 10 seconds.
    7. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
    8. Let engine idle for 1 minute.
    9. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F). If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches 70°C (158°F).
    10. Open engine hood.
    11. On CONSULT screen, select "ENGINE">>"DTC Work Support">>"HO2S2">>"HO2S2 (B1) P1146" (for DTC P2270).
    12. Start engine and follow the instruction of CONSULT display.
      NOTE: SYMBOL It will take at most 10 minutes until "COMPLETED" is displayed.
    13. Touch "SELF-DIAG RESULTS".

    Is "OK" displayed on CONSULT screen?

    YES-1>>

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES-2>>

    Confirmation after repair: INSPECTION END

    NO>>

    Refer to DTC Diagnosis Procedure .

    CAN NOT BE DIAGNOSED>>

    GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN 
    1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
    2. Perform DTC confirmation procedure again.

    >>

    GO TO 3.

  5. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION-1 
    NOTE: SYMBOL Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

    SYMBOL Without CONSULT

    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
    4. Let engine idle for 1 minute.
    5. Check the voltage between ECM harness connector terminals under the following condition.
      ECM Condition Voltage
      Connector + -
      Terminal
      F14 90 98 Revving up to 4, 000 RPM under no load at least 10 times The voltage should be below 0.18 V at least once during this procedure.

    Is the inspection result normal?

    YES-1>>

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES-2>>

    Confirmation after repair: INSPECTION END

    NO>>

    GO TO 6.

  6. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION-2 

    Check the voltage between ECM harness connector terminals under the following condition.

    ECM Condition Voltage
    Connector + -
    Terminal
    F14 90 98 Keeping engine at idle for 10 minutes The voltage should be below 0.18 V at least once during this procedure.

    Is the inspection result normal?

    YES-1>>

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES-2>>

    Confirmation after repair: INSPECTION END

    NO>>

    GO TO 7.

  7. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION-3 

    Check the voltage between ECM harness connector terminals under the following condition.

    ECM Condition Voltage
    Connector + -
    Terminal
    F14 90 98 Coasting from 80 km/h (50 MPH) in D position The voltage should be below 0.18 V at least once during this procedure.

    Is the inspection result normal?

    YES-1>>

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES-2>>

    Confirmation after repair: INSPECTION END

    NO>>

    Refer to DTC Diagnosis Procedure .

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