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Nissan Sentra B18 (2020-2025) Service Manual: P0190 Frp Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0190

FUEL PRES SEN/CIRC

(Fuel rail pressure sensor “A” circuit)

Diagnosis condition

Engine running at idle

Signal (terminal)

Fuel rail pressure sensor signal

Threshold

Signal voltage from the fuel rail pressure sensor remains at more than 4.84 V / less than 0.2 V

Diagnosis delay time

5 seconds or more

POSSIBLE CAUSE

  • Harness or connectors

    • Fuel rail pressure sensor circuit is open or shorted.

    • Sensor power supply 2 is shorted.

  • Fuel rail pressure sensor

  • Each sensor, connected with sensor power supply 2 circuit

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).

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. CHECK DTC PRIORITY

    If DTC P0193 is displayed with DTC P0088 or P0090, first perform the trouble diagnosis for DTC P0088 or P0090.

    Is other DTC detected?

    YES >>

    Perform diagnosis of applicable.

    • DTC P0088: Refer to DTC Description.

    • DTC P0090: Refer to DTC Description.

    NO >>

    GO TO 2.

  2. PRECONDITIONING

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

    TESTING CONDITION:

    Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE

    1. Start engine and let it idle for at least 1 minute.

    2. Check DTC or 1st trip DTC.

    Is DTC or 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 FRP SENSOR POWER SUPPLY-1

    1. Turn ignition switch OFF.

    2. Disconnect FRP sensor harness connector.

    3. Turn ignition switch ON.

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

      FRP sensor

      Voltage

      Connector

      +

      −

      Terminal

      F101

      1

      3

      Approx. 5 V

    Is inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 2.

  2. CHECK FRP SENSOR POWER SUPPLY-2

    Check the voltage between FRP sensor harness connector and ground.

    +

    Ground

    Voltage

    FRP sensor

    Connector

    Terminal

    F101

    1

    Ground

    Approx. 5 V

    Is inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    GO TO 3.

  3. CHECK FRP SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

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

      FRP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F101

      1

      F24

      43

      Existed

    Is inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK SENSOR POWER SUPPLY 2

    Refer to Diagnosis Procedure.

    Is inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace malfunctioning part.

  5. CHECK FRP SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector

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

      FRP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F101

      3

      F24

      45

      Existed

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

    Is inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK ECM GROUND CIRCUIT

    Check the continuity between ECM harness connector and the ground.

    ECM

    Ground

    Continuity

    Connector

    Terminal

    F24

    5

    Ground

    Existed

    65

    F25

    69

    E16

    157

    159

    162

    Is inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace malfunctioning part.

  7. CHECK FRP SENSOR SIGNAL CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

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

      FRP sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F101

      2

      F24

      44

      Existed

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

    Is inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair or replace malfunctioning part.

  8. CHECK FRP SENSOR

    Refer to Component Inspection.

    Is inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Repair or replace malfunctioning part.

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