LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0183 >> DTC P0128: Thermostat Function >> DTC Logic >> DTC Confirmation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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: 

      • For best results, perform at ambient temperature of -10°C (14°F) or higher. 
      • For best results, perform at engine coolant temperature of -10°C (14°F) to 51°C (124°F). 
      • Before performing the following procedure, do not add fuel. 

        : GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE 

    WITH CONSULT

    1. Turn A/C switch OFF.
    2. Turn blower fan switch OFF.
    3. Turn ignition switch ON.
    4. Select "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT.
    5. Check the indication of "COOLAN TEMP/S".

      If it is below 51°C (124°F), go to next step.

      If it is above 51°C (124°F), cool engine down to less than 51°C (124°F). Then go to next step.

    6. Start engine and drive vehicle for 10 consecutive minutes under the following conditions.
      Vehicle speed More than 56 km/h (35 MPH)
      CAUTION: Always drive vehicle at a safe speed.
      NOTE: If "COOLAN TEMP/S" increases to more than 70°C (158°F) within 10 minutes, turn ignition switch OFF because the test result will be OK.
    7. Check 1st trip DTC.

      WITH GST

      Follow the procedure "With CONSULT" above.

      Is 1st trip DTC detected? 

      YES: Proceed to "DIAGNOSIS PROCEDURE ".

      NO: INSPECTION END