LEMON Manuals: Even more car manuals for everyone
Home >> Infiniti >> 2017 >> QX80 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC/Circuit Diagnosis >> DTC P119A, P119B: Fuel Rail Pressure Sensor >> DTC Logic >> DTC Confirmation Procedure

DTC Confirmation Procedure

  1. PRECONDITIONING-I

    If DTC Confirmation Procedure is 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.

    TESTING CONDITION: 

    Before performing the following procedure, check that battery voltage is 9 V or more with ignition switch ON. 

    GO TO STEP 2  .

  2. PRECONDITIONING-II

    NOTE:
    • When it is certain that the previous driving is performed with the engine warmed up, the next steps can be performed.
    • When it is difficult to satisfy the conditions, performing Component Function Check can identify the presence or absence of malfunction in the part/system that may result in a possible cause of this DTC. (Perform DTC Confirmation Procedure as much as possible.)
    1. Start the engine and warm it up until engine coolant temperature reaches 70°C (158°F) or more.
    2. Stop the engine and leave the vehicle in a cool place (soak the engine) until the engine coolant temperature reaches 35°C (95°F) or less.
    CAUTION:
    • The difference between air temperature and engine coolant temperature must be 5°C (9°F) or less.
    • Never turn ignition switch ON during soak the engine.

    Are the conditions satisfied?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 3  .

  3. COMPONENT FUNCTION CHECK

    G-20 With CONSULT

    1. Turn ignition switch OFF.
    2. Start the engine.
    3. On CONSULT screen, select "DATA MONITOR" mode of "ENGINE".
    4. Check the value of "FUEL PRES SEN V" under the following conditions.
      Monitor Item Condition Values/Status
      FUEL PRES SEN V Engine speed: Idle 820 - 1, 220 mV
      Engine speed: Revving engine from idle to 4, 000 rpm quickly 820 - 3, 060 mV

    G-21 Without CONSULT

    1. Turn ignition switch OFF.
    2. Start the engine.
    3. Check fuel rail pressure sensor signal voltage.
    ECM Condition Value
    (Approx.)
    Connector + -
    Terminal
    F91 25 13 [Engine is running]
    • Warm-up condition
    • Idle speed
    		 0.82 - 1.22 V
    [Engine is running]
    • Warm-up condition
    • Revving engine from idle to 4, 000 rpm quickly
    		 0.82 - 3.06 V

    Is the inspection result normal?

    YES 

    INSPECTION END.

    NO 

    Proceed to DIAGNOSIS PROCEDURE .

  4. PERFORM DTC CONFIRMATION PROCEDURE-1

    G-20 With CONSULT

    1. Turn ignition switch ON (engine stopped).
    2. On CONSULT screen, select "ENGINE" >> "DATA MONITOR" >> "COOLAN TEMP/S" and "INT/A TEMP SE".
    3. Check that the indicated value of "COOLAN TEMP/S" is less than 35°C (95°F).
    4. Check that the difference between "INT/A TEMP SE" and "COOLAN TEMP/S" is 5°C (41°F) or less.
    5. Check "Self-diagnostic result" of "ENGINE".

    Is the DTC detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO-1 (Conditions satisfied) 

    GO TO STEP 5  .

    NO-2 (Conditions not satisfied) 

    GO TO STEP 2  .

  5. PERFORM DTC CONFIRMATION PROCEDURE-2

    1. Start the engine (or cranking) at least 1 second.
    2. Check "Self-diagnostic result" of "ENGINE".

    Is the DTC detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO-1 

    To check malfunction symptom before repair: Refer to INTERMITTENT INCIDENT .

    NO-2 

    Confirmation after repair: INSPECTION END

scientia non olet · About LEMON Manuals