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Home >> Infiniti >> 2007 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0153 >> DTC P0128 Thermostat Function >> DTC Confirmation Procedure >> With Consult-II

With Consult-II

  1. Replace thermostat with new one. Refer to "THERMOSTAT AND WATER PIPING ". Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may come on.
  2. Turn ignition switch ON.
  3. Select "COOLAN TEMP/S" in "DATA MONITOR" mode with CONSULT-II.
  4. Check that the "COOLAN TEMP/S" is above 72°C (162°F).

    If it is below 72°C (162°F), go to following step.

    If it is above 72°C (162°F), cool down the engine to less than 72°C (162°F), then retry from step  1.

  5. Drive vehicle for 10 consecutive minutes under the following conditions.
    CONDITION CHART

    VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH)

    If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE ".

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