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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 ECM 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 SEF099X SEF198X Refrigerant pressure is less than 1.76 Mpa. Refrigerant pressure is between 1.76 Mpa and 2.06 Mpa. Refrigerant pressure is above 2.06 Mpa. 20 (12) 80 (50) Vehicle speed km/h (MPH) 20 (12) 80 (50) Vehicle speed km/h (MPH) 20 (12) 80 (50) Vehicle speed km/h (MPH) Cooling fans operate Cooling fans operate Cooling fans 105 (221) 100 (212) 95 (203) 105 (221) 100 (212) 95 (203) 105 (221) 100 (212) 95 (203) Engine coolant temperature °C (°F) Engine coolant temperature °C (°F) Engine coolant temperature °C (°F) DTC P1217 OVERHEAT (COOLING SYSTEM) SR20DE System Description EC-279 |