2. Start the engine and let it idle.
3. Turn on the air conditioning system and maintain the coolant temperature at no more than 80°C.
4. Using a voltmeter, measure the voltage between the connector contacts on the fan controller side and make sure that the voltage changes repeatedly as follows in accordance with the points (1) - (3) (Fig. 5.7).
- (1) 0 V
- (2) 8.2±2.6 V
- (3) Battery voltage ±2.6V
Fig. 5.7 Checking the fan speed controller (engine 4G9)
5. If the voltage does not change repeatedly in accordance with the points (1) - (3), replace the radiator fan motor and fan controller.
(The article was taken from the website: MitsubishiMan)