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Home >> Infiniti >> 2004 >> G35 x >> Repair and Diagnosis >> Engine Performance >> System >> 2004 - Engine Control System - Sedan >> Trouble Diagnosis >> DTC P0128: Thermostat Function >> DTC Confirmation Procedure

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 WATER INLET AND THERMOSTAT ASSEMBLY . 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
Fig 1: Testing Condition - VHCL Speed SE
G00733080Courtesy of NISSAN MOTOR CO., U.S.A.

If 1st trip DTC is detected, go to Diagnostic Procedure 

TESTING CONDITION: WITH GST 

  1. Follow the procedure "WITH CONSULT-II" above