Nissan Sentra manuals

Nissan Sentra B18 (2020-2025) Service Manual: Fuel Injector

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Component Parts /circuit Diagnosis / Fuel Injector

Component Function Check

Component Function Check

  1. INSPECTION START

    Turn ignition switch to START.

    Are any cylinders ignited?

    YES >>

    GO TO 2.

    NO >>

    Refer to Diagnosis Procedure.

  2. CHECK FUEL INJECTOR FUNCTION

    With CONSULT

    1. Start engine.

    2. Perform “POWER BALANCE” in “ACTIVE TEST” mode of “ENGINE” with CONSULT.

    3. Check that each circuit produces a momentary engine speed drop.

    Without CONSULT

    1. Start engine and let it idle.

    2. Listen to each fuel injector operating sound.

      Clicking sound should be heard.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Turn ignition switch OFF.

    2. Check that the following fuse is not blowing.

      Fuse No.

      Capacity

      #60

      10A

      #64

      15 A

    Is the fuse blown (open)?

    YES >>

    Replace the fuse after repairing the applicable circuit.

    NO >>

    GO TO 2.

  2. CHECK FUEL INJECTOR DRIVER POWER SUPPLY

    1. Disconnect ECM harness connector.

    2. Turn ignition switch ON.

    3. Check the voltage between ECM harness connector and ground.

      +

      −

      Voltage

      ECM

      Connector

      Terminal

      F24

      3

      Ground

      Battery voltage

      4

    Is the inspection result normal?

    YES >>

    GO TO 9.

    NO >>

    GO TO 3.

  3. CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect direct fuel injector relay 1 and 2 harness connector.

    4. Check the continuity between ECM harness connector and direct fuel injector relay 1 and 2 harness connector.

      ECM

      Direct fuel injector relay 1 and 2

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F24

      3

      F60

      2

      Existed

      4

      7

    5. 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 DIRECT FUEL INJECTOR RELAY 1 AND 2 POWER SUPPLY (CONTACT SIDE)

    Check the voltage between fuel injector relay harness connector and ground.

    +

    −

    Voltage

    Direct fuel injector relay 1 and 2

    Connector

    Terminal

    F60

    1

    Ground

    Battery voltage

    6

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Perform trouble diagnosis for power supply circuit.

  5. CHECK DIRECT FUEL INJECTOR RELAY 1 AND 2 POWER SUPPLY (EXCITATION COIL SIDE)

    1. Install all removed parts.

    2. Turn ignition switch ON.

    3. Check the voltage between direct fuel injector relay 1 and 2 harness connector and ground.

      +

      −

      Voltage

      Direct fuel injector relay 1 and 2

      Connector

      Terminal

      F60

      3

      Ground

      Battery voltage

      8

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 6.

  6. CHECK DIRECT FUEL INJECTOR RELAY 1 AND 2 POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)

    1. Turn ignition switch OFF.

    2. Disconnect direct fuel injector relay 1 and 2 harness connector.

    3. Disconnect IPDM E/R harness connector.

    4. Check the continuity between IPDM E/R harness connector and fuel injector relay harness connector.

      IPDM E/R

      Direct fuel injector relay 1 and 2

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F96

      73

      F60

      3

      Existed

      8

    5. 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.

  7. CHECK FUEL INJECTOR RELAY GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect fuel injector relay harness connector.

    3. Check the continuity between direct fuel injector relay 1 and 2 harness connector and ground.

      Direct fuel injector relay 1 and 2

      —

      Continuity

      Connector

      Terminal

      F60

      4

      Ground

      Existed

      9

    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 DIRECT FUEL INJECTOR RELAY 1 AND 2

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace direct fuel injector relay 1 and 2.

  9. CHECK ECM GROUND CIRCUIT

    1. Turn ignition switch OFF.

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

      ECM

      —

      Continuity

      Connector

      Terminal

      F24

      5

      Ground

      Existed

      65

      F25

      69

      E16

      157

      159

      162

    3. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 10.

    NO >>

    Repair or replace malfunctioning part.

  10. CHECK FUEL INJECTOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between fuel injector harness connector and ECM harness connector.

      Fuel injector

      ECM

      Continuity

      Cylinder

      Connector

      Terminal

      Connector

      Terminal

      1

      F18

      2

      F24

      8

      Existed

      2

      F19

      2

      7

      3

      F20

      2

      9

      4

      F21

      2

      6

    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Repair or replace malfunctioning part.

  11. CHECK FUEL INJECTOR

    Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace malfunctioning fuel injector. Refer to Removal and Installation.

Component Inspection

Component Inspection

  1. CHECK FUEL INJECTOR

    1. Turn ignition switch OFF.

    2. Disconnect fuel injector harness connector.

    3. Check the resistance between fuel injector terminals.

      Fuel injector

      Condition

      Resistance

      Terminal

      1

      2

      Temperature

      20°C (68°F)

      1.34 – 1.64 Ω

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace fuel injector. Refer to Component Parts Location.

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