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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Qr25DE >> DTC P0128: Thermostat Function >> Diagnostic Trouble Code (DTC) Confirmation Procedure >> Testing Condition: >> With Consult-II
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With Consult-II

  1. Replace thermostat with new one. Refer to "THERMOSTAT AND THERMOSTAT HOUSING ". 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 68°C (154°F).

    If it is below 68°C (154°F), go to following step.

    If it is above 68°C (154°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.
    Fig 1: Vehicle Speed Specification
    G00776995Courtesy of NISSAN MOTOR CO., U.S.A.

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