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System Description NCEC0433 COOLING FAN CONTROL NCEC0433S01 Sensor Input Signal to ECM ECM func- tion Actuator Vehicle speed sensor or ABS actuator and Vehicle speed Cooling fan Cooling fan relay(s) Engine coolant temperature sensor Engine coolant temperature Air conditioner switch Air conditioner “ON” signal Ignition switch Start signal Refrigerant pressure sensor Refrigerant pressure The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger- OPERATION NCEC0433S02 Engine coolant temperatures at which the cooling fan turns “ON” are indicated in the Table below. Vehicle speed km/h (MPH) Air conditioner switch High pressure of refrigerant kPa (bar, kg/cm 2 , psi) Less than 20 (12) 20 - 80 (12 - 50) More than 80 (50) ON More than 1,760 (17.6, 17.95, 255) Always Always More than 95°C (203°F) Less than 1,760 (17.6, 17.95, 255) Always More than 95°C (203°F) More than 95°C (203°F) OFF More than 100°C (212°F) More than 95°C (203°F) More than 95°C (203°F) CONSULT-II Reference Value in Data Monitor NCEC0486 Specification data are reference values. MONITOR ITEM CONDITION SPECIFICATION AIR COND SIG I Engine: After warming up, idle Air conditioner switch: OFF OFF Air conditioner switch: ON ON COOLING FAN I After warming up engine, idle I Air conditioner switch: OFF Engine coolant temperature is less OFF Engine coolant temperature is ON SEF099X DTC P1217 OVERHEAT (COOLING SYSTEM) QG16 I 18DE System Description EC-289 |