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DTC P0128 THERMOSTAT FUNCTION EC-945 [VK45DE] C D E F G H I J K L M A EC DTC P0128 THERMOSTAT FUNCTION PFP:21200 On Board Diagnosis Logic NBS005DK Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long DTC Confirmation Procedure NBS005DL NOTE: ● For best results, perform at ambient temperature of –10 ° C (14 ° F) or higher. ● For best results, perform at engine coolant temperature of –10 ° C (14 ° F) to 60 ° C (140 ° F). WITH CONSULT-II 1. Replace thermostat with new one. Refer to CO-55, "THERMOSTAT AND WATER CONTROL VALVE" Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may 2. Turn ignition switch ON. 3. Select “COOLAN TEMP/S” in “DATA MONITOR” mode with 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 If 1st trip DTC is detected, go to EC-945, "Diagnostic Procedure" . WITH GST 1. Follow the procedure “WITH CONSULT-II” above. Diagnostic Procedure NBS005DM 1. CHECK ENGINE COOLANT TEMPERATURE SENSOR Refer to EC-946, "Component Inspection" OK or NG OK >> INSPECTION END NG >> Replace engine coolant temperature sensor. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0128 Thermostat function The engine coolant temperature does not ● Thermostat ● Leakage from sealing portion of thermostat ● Engine coolant temperature sensor VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH) SEF176Y |