Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 7) >> Engine (ECM) >> P0087 FRP Control System >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P0090, P1197, P0190, P119A, P119B, P119C, P020x, or P062B, first perform the trouble diagnosis of DTC P0090, P1197, P0190, P119A, P119B, P119C, P020x, or P062B.

    Is applicable DTC detected?

    YES>>

    Perform the diagnosis of the applicable. Refer to DTC Index .

    NO>>

    GO TO 2

    .

  2. CHECK FUEL LEVEL 

    Check that the fuel level is enough.

    Is there 1/8 or more fuel?

    YES>>

    GO TO 4.

    NO>>

    GO TO 3

    .

  3. REFUEL THE VEHICLE 
    1. Refuel to over 1/8 of full.
    2. Start the engine and keep the engine speed at 3, 000 rpm for 30 seconds.
      NOTE: For best results, warm up the engine until "COOLANT TEMP/S" on "DATA MONITOR" mode of "ENGINE" reaches at least 70°C (158°F).
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Turn ignition switch ON.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Turn ignition switch ON.
    7. Erase the DTC.
    8. Start the engine and let it idle at least 60 seconds.
    9. Perform DTC confirmation procedure again. Refer to Confirmation Procedure .

    Is DTC P0087 detected?

    YES>>

    GO TO 4.

    NO>>

    INSPECTION END

  4. AIR BLEED THE FUEL LINE 
    1. Start the engine, and let the engine run at idle at least for 10 minutes.
    2. Perform DTC confirmation procedure of DTC P0087.

    Is 1st trip DTC detected?

    YES>>

    GO TO 5

    .

    NO>>

    GO TO 18

    .

  5. CHECK HIGH FUEL PRESSURE (FEED PRESSURE) 
    1. Perform fuel pressure release. Refer to Work Procedure .
    2. Turn ignition switch ON and select "DATA MONITOR" mode of "ENGINE" using CONSULT.
    3. Check the indication of "FUEL PRES SEN".
      Monitor item Indication
      FUEL PRES SEN Approx. 0.450 Mpa or more

    Is inspection result normal?

    YES>>

    GO TO 6

    .

    NO>>

    GO TO 10

    .

  6. CHECK HIGH PRESSURE FUEL PUMP 

    Check high pressure fuel pump. Refer to Component Inspection . Is inspection result normal?

    YES>>

    GO TO 7

    .

    NO>>

    Repair or replace the error-detected parts.

  7. CHECK FUEL RAIL PRESSURE SENSOR 

    Check fuel rail pressure sensor. Refer to Component Inspection . Is inspection result normal?

    YES>>

    GO TO 8

    .

    NO>>

    Repair or replace the error-detected parts.

  8. CHECK HIGH PRESSURE FUEL LEAKAGE 
    1. Start the engine.
    2. Visually check that the high pressure fuel pump, fuel rail, and fuel piping have no fuel leakage.

    Is inspection result normal?

    YES>>

    GO TO 9

    .

    NO>>

    Replace the error-detected parts.

  9. CHECK HIGH PRESSURE FUEL PUMP LIFTER 

    Check high pressure fuel pump lifter. Refer to HIGH PRESSURE FUEL PUMP AND FUEL HOSE : Removal and Installation . Does the lifter top surface have scratches and/or dents?

    YES>>

    Replace the error-detected parts.

    NO>>

    GO TO 16

    .

  10. CHECK LOW FUEL PRESSURE 

    Check low fuel pressure. Refer to Work Procedure . Is inspection result normal?

    YES>>

    GO TO 11

    .

    NO>>

    GO TO 16

    .

  11. CHECK FUEL RAIL PRESSURE SENSOR 

    Check fuel rail pressure sensor. Refer to Component Inspection . Is inspection result normal?

    YES>>

    GO TO 12

    .

    NO>>

    Repair or replace the error-detected parts.

  12. CHECK HIGH PRESSURE FUEL LEAKAGE 
    1. Start the engine.
    2. Visually check that the high pressure fuel pump, fuel rail, and fuel piping have no fuel leakage.

    Is inspection result normal?

    YES>>

    GO TO 13

    .

    NO>>

    Replace the error-detected parts.

  13. CHECK HIGH PRESSURE FUEL PUMP LIFTER 

    Check high pressure fuel pump lifter. Refer to HIGH PRESSURE FUEL PUMP AND FUEL HOSE : Removal and Installation . Does the lifter top surface have scratches and/or dents?

    YES>>

    Replace the error-detected parts.

    NO>>

    GO TO 14

    .

  14. REPLACE HIGH PRESSURE FUEL PUMP 

    Replace the high pressure fuel pump. Refer to Component Inspection .

    >>

    GO TO 15

    .

  15. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Erase DTC.
    2. Perform DTC confirmation procedure. Refer to Confirmation Procedure .

    Is the DTC P0087 detected again?

    YES>>

    Replace the fuel rail.

    NO>>

    INSPECTION END

  16. CHECK LOW PRESSURE FUEL PUMP 

    Check low pressure fuel pump. Refer to Component Function Check . Is inspection result normal?

    YES>>

    GO TO 17

    .

    NO>>

    Repair or replace the error-detected parts.

  17. DETECT MALFUNCTIONING PART 

    Check fuel hoses and fuel tubes for clogging.

    Is inspection result normal?

    YES>>

    GO TO 18

    .

    NO>>

    Repair or replace the error-detected parts.

  18. CHECK FPCM 

    Check FPCM. Refer to Component Inspection . Is inspection result normal?

    YES>>

    GO TO 19

    .

    NO>>

    Repair or replace the error-detected parts.

  19. CHECK LOW PRESSURE FUEL LINE FOR INTERNAL LEAKAGE 
    1. Start the engine.
    2. Visually check that the low pressure fuel pump, fuel rail, and fuel piping have no fuel leakage.

    Is inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Replace the error-detected parts.

scientia non olet · About Mike's Workshop Manuals