ENGINE OVER TEMPERATURE (OVERHEAT) - System Description
EF & EC-7219prose procedureSystem Description
COOLING FAN CONTROL
Vehicle speed sensor
Input Signal to ECMVehicle speed
ECM functionCooling fan control
ActuatorCooling fan relay(s)
Engine coolant temperature sensor
Input Signal to ECMEngine coolant temperature
ECM functionCooling fan control
ActuatorCooling fan relay(s)
Air conditioner switch
Input Signal to ECMAir conditioner "ON" signal
ECM functionCooling fan control
ActuatorCooling fan relay(s)
Ignition switch
Input Signal to ECMStart signal
ECM functionCooling fan control
ActuatorCooling fan relay(s)
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, and air conditioner ON signal. The control system has ON-OFF control.
OPERATION
Engine coolant temperatures at which the cooling fan turns "ON" are indicated in the Table below.
ON
Less than 20 (12) km/h (MPH)Always
20 - 80 (12 - 50) km/h (MPH)Always
More than 80 (50) km/h (MPH)More than 97°C (207°F)
OFF
Less than 20 (12) km/h (MPH)More than 97°C (207°F)
20 - 80 (12 - 50) km/h (MPH)More than 97°C (207°F)
More than 80 (50) km/h (MPH)More than 97°C (207°F)
CONSULT-II Reference Value in Data Monitor Mode
Specification data are reference values.
AIR COND SIG
CONDITIONEngine: After warming up, idle the engine; Air conditioner switch: OFF
SPECIFICATIONOFF
AIR COND SIG
CONDITIONEngine: After warming up, idle the engine; Air conditioner switch: ON (Compressor operates)
SPECIFICATIONON
COOLING FAN
CONDITIONAfter warming up engine, idle the engine. Air conditioner switch: OFF; Engine coolant temperature is less than 97°C (198°F)
SPECIFICATIONOFF
COOLING FAN
CONDITIONAfter warming up engine, idle the engine. Air conditioner switch: OFF; Engine coolant temperature is 97°C (207°F) or more
SPECIFICATIONON