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Home >> Nissan-Datsun >> 2007 >> X-Trail LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0139 >> DTC P0128 Thermostat Function >> DTC Confirmation Procedure
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DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION: 

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 "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 68°C (154°F), then retry from step  1.

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

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

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

Fig 1: Generic Scan Tool - Vehicle Speed Sensor
G06152440Courtesy of NISSAN MOTOR CO., U.S.A.

WITH GST 

Follow the procedure "WITH CONSULT-II" above.