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P0128 THERMOSTAT FUNCTION EC-261 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O Drive the vehicle under the conditions instructed below until the difference between “COOLAN TEMP/S” and “FUEL T/TMP SE” becomes at least 23 °C (41°F). *: Example - STEP 2 Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLAN TEMP/S” and “FUEL T/TMP SE” maintained at 23 °C (41°F) or more. NOTE: Keep the accelerator pedal as steady as possible during cruising. - STEP 3 Drive the vehicle at 50 km/h (32 MPH) or more until “COOLAN TEMP/S” increases by 6 °C (11°F). NOTE: Keep the accelerator pedal as steady as possible during cruising. Is the condition satisfied? YES >> GO TO 4. NO >> GO TO 1. 4. PERFORM DTC CONFIRMATION PROCEDURE-II With CONSULT 1. Drive the vehicle until the following condition is satisfied. CAUTION: Always drive vehicle at safe speed. 2. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000012197823 1. CHECK ENGINE COOLANT TEMPERATURE SENSOR Check the engine coolant temperature sensor. Refer to EC-261, "Component Inspection" . Is the inspection result normal? YES >> GO TO 2. NO >> Replace engine coolant temperature sensor. Refer to 2. CHECK THERMOSTAT Check the thermostat. Refer to Is the inspection result normal? YES >> INSPECTION END NO >> Replace thermostat. Refer to CO-23, "Removal and Installation" Component Inspection INFOID:0000000012197824 1. CHECK ENGINE COOLANT TEMPERATURE SENSOR COOLAN TEMP/S 65 °C (149°F) or less FUEL T/TMP SE Less than the value calculated by sub- °C (41°F) from “COOLAN TEMP/S”.* COOLAN TEMP/S FUEL T/TMP SE 70 °C (158°F) 47 °C (117°F) or less 65 °C (149°F) 42 °C (108°F) or less 60 °C (140°F) 37 °C (99°F) or less COOLAN TEMP/S 65 °C (149°F) or more |