Daewoo CIELO EURO III Manual page 242

1F – 7 4 ENGINE CONTROLS
ENGINE COOLING FAN CIRCUIT CHECK – WITH A/C
Circuit Description
The engine cooling fan circuit operates the main cooling
fan and the auxiliary cooling fan. The cooling fans are
controlled by the engine control module
(ECM) based on inputs from the Engine Coolant
Temperature (ECT) sensor and the Air
Conditioning Pressure (ACP) sensor. The ECM
controls the low speed cooling fan operation by internal-
ly grounding the ECM connector terminal K28.
This energizes the low speed cooling fan relay and oper-
ates the main cooling fan and the auxiliary cooling fan at
low speed as the cooling fans are connected in a series
circuit. The ECM controls the high speed cooling
fan operation by internally grounding the ECM
connector terminal K28 and the ECM connector
terminal K12 at the same time. This energizes the low
speed cooling fan relay, the high speed cooling fan relay,
and the series/parallel cooling fan relay resulting in high
speed fan operation as the cooling fans are now con-
nected in a parallel circuit.
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 engine fuse block fuses F14 become open
(blown) immediately after installation, inspect for a
F41F013
DAEWOO T-154 BL2,3