Daewoo CIELO EURO III Manual page 238

1F – 70 ENGINE CONTROLS
ENGINE COOLING FAN CIRCUIT CHECK – WITHOUT A/C
Circuit Description
The engine cooling fan circuit operates the cooling fan.
The cooling fan is controlled by the
engine control module (ECM) based on
input from the Engine Coolant Temperature (ECT) sen-
sor. The ECM controls the low speed cooling fan
operation by internally grounding the ECM con-
nector terminal K28. This energizes the low speed cool-
ing fan relay and operates the cooling fan at low speed.
The low speed cooling fan operation is achieved by the
cooling fan resistor causing a drop in the voltage sup-
plied to the cooling fan. The ECM controls the high
speed cooling fan operation by internally grounding the
ECM connector terminal K12. This energizes the
high speed cooling fan relay, bypassing the radiator fan
resistor. This results in high speed cooling fan operation.
Diagnostic Aids
If the owner complained of an overheating problem, it
must be determined if the complaint was due to an
actual boil over, or the engine coolant temperature
gauge indicated overheating. If the engine is over-
heating and the cooling fans are on, the cooling sys-
tem should be checked.
If the I/P fuse block fuse F14 or
fuse F11 become open (blown) immediately after
installation, inspect for a short to ground in the wiring
of the appropriate circuit. If the fuses become open
(blown) when the cooling fan is to be turned on by the
ECM, suspect a faulty cooling fan motor.
The ECM will turn the cooling fans on at low
speed when the coolant temperature is 93 C
TAA1F430
DAEWOO T-154 BL2,3