Page 778 - Workshop Manual - Tunland (2017)
P. 778
04-92 DIAGNOSTICS - ENGINE CONTROL SYSTEM
04
P245，P2377-FAN CONTROL CIRCUIT FAULT
P245-FAN CONTROL CIRCUIT -VOLTAGE IS BELOW NORMAL
OR SHORTED TO LOW VOLTAGE POWER SUPPLY
P2377-FAN CONTROL CIRCUIT -VOLTAGE IS ABOVE NORMAL
OR SHORTED TO HIGH VOLTAGE POWER SUPPLY
Description
1 . The fan control circuit is a device used by the engine to control the operation
of the fan. When the engine control module (ECM) supplies power to the fan
control circuit, the engine fan then engages.The fan control circuit uses a pulse
width modulation (PWM) signal that is a pulse voltage signal between the 0-VDC
and the system voltage.The frequency of this pulse voltage signal depends on
the require of application type.
