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Nissan Sentra B18 (2020-2025) Service Manual: P0197 Eot Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0197

EOT SEN/CIRC

(Engine oil temperature sensor circuit low)

Diagnosis condition

Engine running at idle

Signal (terminal)

Engine oil temperature sensor signal

Threshold

An excessively low voltage from the sensor is sent to ECM

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (The EOT sensor circuit is open or shorted.)

  • Engine oil temperature sensor

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode

Fail safe mode

Nissan Sentra Vehicle behavior

Others

Intake and exhaust valve timing control does not function.

Idle Start/Stop System

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.

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    1. Start engine and wait at least 5 seconds.

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

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

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK ENGINE OIL TEMPERATURE (EOT) SENSOR POWER SUPPLY-1

    1. Turn ignition switch OFF.

    2. Disconnect EOT sensor harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between EOT sensor harness connector terminals.

      EOT sensor

      Voltage

      (Approx.)

      Connector

      +

      −

      Terminal

      F48

      1

      2

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    GO TO 2.

  2. CHECK EOT SENSOR POWER SUPPLY-2

    Check the voltage between EOT sensor harness connector and ground.

    +

    Ground

    Voltage

    (Approx.)

    EOT sensor

    Connector

    Terminal

    F48

    1

    Ground

    5 V

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 3.

  3. CHECK EOT SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between EOT sensor harness connector and ECM harness connector.

      EOT sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F48

      1

      F24

      37

      Existed

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

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for ECM power supply circuit. Refer to Diagnosis Procedure.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK EOT SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between EOT sensor harness connector and ECM harness connector.

      EOT sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F48

      2

      F24

      39

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK ECM GROUND CIRCUIT

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

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    2. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK ENGINE OIL TEMPERATURE SENSOR

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace engine oil temperature sensor. Refer to Exploded View.

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