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Home >> Infiniti >> 2023 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 5) >> Engine (ECM) >> DTC P0090: Fuel Rail Pressure Control System >> DTC Description >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. PRECONDITIONING 

    If DTC CONFIRMATION PROCEDURE has been 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, confirm that battery voltage is 11 V or more at idle.
    • Before performing the following procedure, check that the fuel tank is 1/8 full of fuel.

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE-I 

    SYMBOL WITH CONSULT

    1. Start engine.
    2. Select "COOLAN TEMP/S" in "DATA MONITOR" mode of "ENGNE" using CONSULT.
    3. Maintain the following condition for 5 seconds or more at idle.

      COOLAN TEMP/S

      : 70 deg.C (104 deg.F) or more

    4. Check 1st trip DTC.

    SYMBOL WITH GST

    Follow the above steps for "WITH CONSULT".

    Is 1st trip DTC detected?

    YES

    Refer to DTC Diagnosis Procedure .

    NO

    INSPECTION END