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Home >> Infiniti >> 2005 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0128: Thermostat Function >> Diagnostic Trouble Codes Confirmation Procedure >> With Consult-II
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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 60°C (140°F).

    If it is below 60°C (140°F), go to following step.

    If it is above 60°C (140°F), cool down the engine to less than 60°C (140°F), then retry from step 1.

  5. Drive vehicle for 10 consecutive minutes under the following conditions.
VEHICLE SPEED SPECIFICATION

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

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