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EC-628 < COMPONENT DIAGNOSIS > [VK56DE] P0128 THERMOSTAT FUNCTION P0128 THERMOSTAT FUNCTION On Board Diagnosis Logic INFOID:0000000005257590 NOTE: If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308, first perform the trouble diagnosis for DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308. Refer to EC-686, "DTC Confirmation Procedure" . Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough. This is due to a leakage in the seal or the thermostat being stuck open. DTC Confirmation Procedure INFOID:0000000005257591 NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next step. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. WITH CONSULT-III TESTING CONDITION: • 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 56 ° C (133 ° F). • Before performing the following procedure, do not add fuel. 1. Turn A/C switch OFF. If it is below 56 ° C (133 ° F), go to next step. If it is above 56 ° C (133 ° F), cool down the engine to less than 56 ° C (133 ° F). Then go to next steps. 6. Start engine and drive vehicle for 10 consecutive minutes under the following conditions. If “COOLAN TEMP/S” increases to more than 75 ° C (167 ° F) within 10 minutes, turn ignition switch OFF because the test result will be OK. 7. Check 1st trip DTC. WITH GST Follow the procedure “WITH CONSULT-III” above. Diagnosis Procedure INFOID:0000000005257592 1. CHECK ENGINE COOLANT TEMPERATURE SENSOR EC-629, "Component Inspection" OK or NG DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0128 Thermostat function The engine coolant temperature does not • Thermostat VHCL SPEED SE More than 56 km/h (35 MP) 2010 Pathfinder |