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Nissan Sentra B18 (2020-2025) Service Manual: P044c Egr Volume Control Valve Position Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P044C

EGR SENSOR C

(EGR sensor C circuit low)

Diagnosis condition

Ignition switch ON

Signal (terminal)

EGR volume control valve position sensor

Threshold

ECM detects the following status continuously for 5 seconds or more;

A voltage signal transmitted from the EGR volume control valve position sensor shows too low.

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors

    (EGR volume control valve position sensor circuit is open or shorted.)

  • EGR volume control valve

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode

Fail safe mode

Nissan Sentra Vehicle behavior

Traveling control mode

Accelerator angle variation control

ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction.

Note:

ECM does not control the accelerator pedal releasing speed.

Device fix mode

  • This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position.

  • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).

  • The Intake manifold runner control valve motor is turned OFF (Intake manifold runner control valve opens).

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.

    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

    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 >>

    INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR POWER SUPPLY

    1. Turn ignition switch OFF.

    2. Disconnect EGR volume control valve harness connector.

    3. Turn ignition switch ON.

    4. Check voltage between EGR volume control valve harness connector and ground.

      +

      −

      Voltage

      (Approx.)

      EGR volume control valve

      Connector

      Terminal

      F94

      3

      Ground

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    GO TO 5.

  2. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check harness continuity between EGR volume control valve harness connector and ECM harness connector.

      EGR volume control valve

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F94

      2

      F25

      79

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace error-detected parts.

  3. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR INPUT SIGNAL CIRCUIT

    1. Check harness continuity between EGR volume control valve harness connector and ECM harness connector.

      EGR volume control valve

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F94

      1

      F25

      78

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace error-detected parts.

  4. CHECK EGR VOLUME CONTROL VALVE

    Check the EGR volume control valve. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace EGR volume control valve. Refer to Exploded View.

  5. CHECK EGR VOLUME CONTROL VALVE POSITION SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between EGR volume control valve harness connector and ECM harness connector.

      EGR volume control valve

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F94

      3

      F25

      83

      Existed

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

    Is the inspection result normal?

    YES >>

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

    NO >>

    Repair or replace error-detected parts.

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