2018 Infiniti QX80 AWDFACTORY OEM SERVICE PROCEDURE

Component Inspection

  1. CHECK MULTI-WAY CONTROL VALVE-1 

    SYMBOL With CONSULT

    1. Turn ignition switch ON and engine stopped.
    2. On the CONSULT screen, select "ENGINE">>"WORK SUPPORT">>"ENGINE COOLANT BYPASS VALVE".
    3. Check that indication of "ENGINE COOLANT B/V POSI".

    Is "205 deg" or more displayed on CONSULT screen?

    YES

    GO TO 2.

    NO

    Replace multi-way control valve. Refer to Removal and Installation .

  2. CHECK MULTI-WAY CONTROL VALVE-2 

    SYMBOL With CONSULT

    1. Start the engine.
    2. Warm engine up to the normal operating temperature.
    3. Check the following condition.

      COOLANT TEMP/S

      10 - 100 deg. C (50 - 212 deg. F)

      ENG OIL TEMP

      120 deg. C (248 deg. F) or less

      A/C switch

      OFF
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Start the engine.
    6. Check "ENGINE COOLANT B/V POSI" approximately 2 seconds after engine start.

    Is "40 deg. " or less displayed on CONSULT screen?

    YES

    INSPECTION END

    NO

    Replace multi-way control valve. Refer to Removal and Installation .

Chapter Navigation
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.