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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System) >> DTC P0128: Thermostat Function >> DTC Confirmation Procedure >> Testing Condition: >> With CONSULT-II
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With CONSULT-II

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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 60°C (140°F).

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

    If it is above 60°C (140°F), stop engine and 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: Identifying Vehicle Speed SE 80-120Km/H
    G00775566Courtesy of NISSAN MOTOR CO., U.S.A.

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