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Nissan Sentra B18 (2020-2025) Service Manual: P0137 Ho2s2

Dtc Description

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 (manifold) causes the longer switching time.

: 0.73 V

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

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0137

HO2S2 (B1)

(O2 sensor circuit low voltage bank 1 sensor 2)

Diagnosis condition

—

Signal (terminal)

Heated oxygen sensor 2 signal

Threshold

  • The maximum voltage from the sensor does not reach the specified voltage

  • ECM detects the heated oxygen sensor 2 circuit is short to ground.

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (The heated oxygen sensor 2 circuit is open or shorted.)

  • Heated oxygen sensor 2

  • Fuel pressure

  • Fuel injector

  • Intake air leaks

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. PRECONDITIONING

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

    TESTING CONDITION:

    Check that “COOLANT TEMP/S” indicates between 0°C to 30°C (30°F to 86°F) before conducting following procedure.

    Will CONSULT be used?

    YES >>

    GO TO 2.

    NO >>

    GO TO 4.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    With CONSULT

    1. Turn ignition switch ON and select “DATA MONITOR” mode of “ENGINE” using CONSULT.

    2. Start engine and warm it up to the normal operating temperature.

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

    4. Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

    5. Let engine idle for 1 minute.

    6. Check that “COOLANT TEMP/S” indicates more than 70°C (158°F).

      If not, warm up engine and go to next step when “COOLANT TEMP/S” indication reaches 70°C (158°F).

    7. Open engine hood.

    8. Select “HO2S2 (B1) P1147” in “HO2S2” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT.

    9. Follow the instruction of CONSULT display.

      Note:

      It will take at most 10 minutes until “COMPLETED” is displayed.

    10. 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

    NG>>

    Proceed to DTC Diagnosis Procedure.

    CAN NOT BE DIAGNOSED>>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE AGAIN

    1. Turn ignition switch OFF and leave the Nissan Sentra vehicle in a cool place (soak the vehicle).

    2. Perform DTC confirmation procedure again.

    >>

    GO TO 2.

  4. PERFORM COMPONENT FUNCTION CHECK-1

    Without CONSULT

    Note:

    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.

    1. Start engine and warm it up to the normal operating temperature.

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

    3. Restart 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 conditions.

      ECM

      Condition

      Voltage

      Connector

      +

      –

      Terminal

      F25

      77

      76

      Revving up to 4,000 rpm quickly under no load at least 10 times. (Depress and release the accelerator pedal as quickly as possible.)

      The voltage should be above 0.73 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 5.

  5. PERFORM COMPONENT FUNCTION CHECK-2

    Without CONSULT

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

    ECM

    Condition

    Voltage

    Connector

    +

    –

    Terminal

    F25

    77

    76

    Keeping engine at idle for 10 minutes.

    The voltage should be above 0.73 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-3

    Without CONSULT

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

    CAUTION:

    Always drive Nissan Sentra vehicle at a safe speed.

    ECM

    Condition

    Voltage

    Connector

    +

    –

    Terminal

    F25

    77

    76

    Coasting from 80 km/h (50 MPH) in D position (CVT) or 4th position (M/T).

    The voltage should be above 0.73 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.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

    1. Start engine and warm it up to the normal operating temperature.

    2. Clear the mixture ratio self-learning value. Refer to Work Procedure.

    3. Run engine for at least 10 minutes at idle speed.

    Is the 1st trip DTC P0171 detected? Is it difficult to start engine?

    YES >>

    Perform trouble diagnosis for DTC P0171. Refer to DTC Diagnosis Procedure.

    NO >>

    GO TO 2.

  2. CHECK HEATED OXYGEN SENSOR 2 GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.

    4. Check the continuity between HO2S2 harness connector and ECM harness connector.

      HO2S2

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E72

      1

      F25

      76

      Existed

    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace malfunctioning part.

  3. CHECK HO2S2 INPUT SIGNAL CIRCUIT

    1. Check the continuity between HO2S2 harness connector and ECM harness connector.

      HO2S2

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E72

      2

      F25

      77

      Existed

    2. Check the continuity between HO2S2 harness connector and ground, or ECM harness connector and ground.

      HO2S2

      —

      Continuity

      Connector

      Terminal

      E72

      2

      Ground

      Not existed

      ECM

      —

      Continuity

      Connector

      Terminal

      F25

      77

      Ground

      Not existed

    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK HEATED OXYGEN SENSOR 2

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 5.

  5. REPLACE HEATED OXYGEN SENSOR 2

    Replace heated oxygen sensor 2. Refer to Exploded View.

    CAUTION:

    • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.

    • Before installing new oxygen sensor, clean exhaust system threads.

    >>

    INSPECTION END

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