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Home >> Infiniti >> 2004 >> FX35 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 259 (Engine Control System) >> DTC P0128 Thermostat Function >> DTC confirmation procedure >> Testing Condition
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Testing Condition

WARNING: This page is about a different car, the 2004 Infiniti FX45. However, it is still accessible from the selected car via links, so may be relevant.

With CONSULT-II 

  1. Replace thermostat with new one. Refer to THERMOSTAT AND WATER CONTROL VALVE . 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 COOLANT TEMP/S in DATA MONITOR mode with CONSULT-II.
  4. Check that the COOLANT 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 at speed of 50-75 MPH (80-120 KM/H).

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

With GST 

  1. Follow the procedure With CONSULT-II above.