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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (1 Of 4)) >> DTC/Circuit Diagnosis >> P0191 FRP Sensor >> DTC Diagnosis Procedure >> PR25DD engine

PR25DD engine

WARNING: This page is about a different variant/trim than selected.
NOTE: Turning the ignition switch ON with FRP sensor harness connector disconnected causes ECM to detect DTC P0190. Be sure to erase the DTC when the diagnosis procedure.
  1. CHECK FUEL RAIL PRESSURE (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

      (Approx.)

      Connector

      +

      -

      Terminal

      F116

      3

      1

      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.

    +

    -

    Voltage

    (Approx.)

    FRP sensor

    Connector

    Terminal

    F116

    3

    Ground

    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

      F116

      3

      F91

      43

      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 SENSOR POWER SUPPLY 2 CIRCUIT 

    Refer to Diagnosis Procedure .

    Is inspection result normal?

    YES

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

    NO

    Repair or 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

      F116

      1

      F91

      45

      Existed
    4. Also check harness for short to power.

    Is the 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

    F91

    5

    Ground

    Existed

    65

    F90

    69

    70

    E31

    157

    159

    162

    Is inspection result normal?

    YES

    INSPECTION END

    NO

    Repair or replace malfunctioning part.

  7. CHECK FRP SENSOR SIGNSL 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

      F116

      2

      F91

      44

      Existed
    4. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    Repair or replace malfunctioning part.

  8. CHECK FRP SENSOR 

    Check FRP sensor. Refer to Component Inspection .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace FRP sensor. Refer to Exploded View .

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