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Nissan Sentra B18 (2020-2025) Service Manual: P0117 Ect Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0117

ECT SEN/CIRC

(Engine coolant temperature sensor 1 circuit low)

Diagnosis condition

Ignition switch ON

Signal (terminal)

Engine coolant temperature sensor signal

Threshold

An excessively low voltage from the sensor is sent to ECM

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (The engine coolant temperature sensor circuit is open or shorted.)

  • Engine coolant temperature sensor

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode

Fail safe mode

Nissan Sentra Vehicle behavior

Combustion control mode

Stratified charge combustion control at starting

No stratified charge combustion at starting (cold start).

Idle speed control

Stops feedback control of idle speed and controls with specified speed.

Recovery speed control at decelerating

Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.

Idle neutral control

Stops idle neutral control.

Idle Start/Stop System

When a DTC is detected, the start/stop indicator lamp blinks slowly and the idle start/stop system operation is prohibited.

When ECM detects error while operating the idle start/stop system, ECM restarts the engine.

Confirmation Procedure

Confirmation Procedure

  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    >>

    GO TO 2.

  2. DTC CONFIRMATION PROCEDURE

    1. Turn ignition switch ON and wait at least 5 seconds.

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Proceed 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 COOLANT TEMPERATURE SENSOR POWER SUPPLY-1

    1. Turn ignition switch OFF.

    2. Disconnect engine coolant temperature (ECT) sensor harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between ECT sensor harness connector and ground.

      +

      Ground

      Voltage

      ECT sensor

      Connector

      Terminal

      F6

      1

      Ground

      Approx. 5 V

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    GO TO 2.

  2. CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY-2

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

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

      +

      −

      Continuity

      ECT sensor

      ECM

      Connector

      Terminal

      Connector

      Terminal

      F6

      1

      F24

      34

      Existed

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

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  3. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

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

      +

      −

      Continuity

      ECT sensor

      ECM

      Connector

      Terminal

      Connector

      Terminal

      F6

      2

      F24

      33

      Existed

    4. 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 ECT SENSOR

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace ECT sensor. Refer to Exploded View.

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