Test of electrically controlled cooling fan
This function is a test and is used to perform a hardware check on the fan clutch. When disengaging the fan, it may take up to 10 minutes before the fan speed decrease. The fan's disengagement time is influenced by the temperature of the oil in the fan hub.
If the fan clutch PWM signal is 0 %, the fan doesn't need to be engaged.
Increase the speed to 1000 rpm.
Wait for the fan speed to drastically change.
Check that the fan speed is within correct working area.
If the fan clutch PWM signal is 100 %, the fan doesn't need to be disengaged.
Increase the speed to 1000 rpm.
Wait for the fan speed to drastically change.
Check that the fan speed is within correct working area.
The engine and other systems may overheat if the test conditions are not followed.
Normal fan speed, when there is no fan request and engine at normal operating temperature at idle, is 200 - 300 rpm.
Fan speed when fully engaged clutch: 80 - 95 % of maximum fan speed.
Condiţii de derulare test:
Engine at operating temperature (minimum 65°C).
Air compressor disconnected.
A box with test conditions is shown. Press "OK" to proceed.
Start and stop activation of the selected test.
Check the different values.