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Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0308 >> DTC P0128: Thermostat Function >> DTC Confirmation Procedure >> With Consult-III
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

With Consult-III

  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-III.
  5. Check the indication of "COOLAN TEMP/S".

    If it is below 71°C (160°F), go to following step.

    If it is above 71°C (160°F), cool down the engine to less than 71°C (160°F), then go to next step.

  6. Start engine.
  7. Wait at idle for a least 30 minutes.

    If "COOLAN TEMP/S" increases to more than 71°C (160°F) within 30 minutes, turn ignition switch OFF because the test result will be OK. 

  8. Check 1st trip DTC.
  9. If 1st trip DTC is detected, go to "DIAGNOSIS PROCEDURE ".
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