Daewoo CIELO EURO III Manual page 243

short to ground in the wiring of the appropriate circuit.
If the fuses become open (blown) when the cooling
fans are 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.
The ECM will turn the cooling fans off
when the coolant temperature is 90 C .
The ECM will turn the cooling fans on at high
speed when the coolant temperature is 97 C.
The ECM will change the cooling fans
from high speed to low speed when the coolant tem-
perature is 94 C .
The ECM will turn the cooling fans on at low
speed when the A/C system is on. The ECM will
change the cooling fans from low speed to high speed
when the high side A/C pressure is 1 882 kPa (273
psi) then return to low speed when the high side A/C
pressure is 1 448 kPa (210 psi). When the A/C sys-
tem is on, the ECM will change the cooling fans
from low to high speed when the coolant temperature
reaches 117 C (244 F) then return to low speed
when the coolant temperature reaches 114 C
(237 F).
The cooling fan circuit can be checked quickly by dis-
connecting the ECM connector 2 and grounding
the connector terminal K28. This should create low
Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the check completed?
1. Check the engine fuse block fuse F14.
2 2. Replace the fuse as needed.
Is the fuse OK?
1. Check the I/P fuse block fuse F11.
3 2. Replace the fuse as needed.
Is the fuse OK?
1. Turn the ignition OFF.
2. Turn the A/C switch OFF.
3. Connect a scan tool to the data link connector
(DLC).
4
4. Start the engine.
5. The cooling fans should run at low speed when
the coolant temperature reaches 93 C.
Do the cooling fans run at low speed?
DAEWOO T-154 BL2,3
Engine Cooling Fan Circuit Check – With A/C
Action
ENGINE CONTROLS 1F – 7 5
speed cooling fan operation with the ignition ON. By
grounding the ECM connector terminals K28
and K12 and turning the ignition ON, high speed cool-
ing fan operation should be achieved.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
4. This step, along with step 5, checks for the ability of
the ECM to operate the cooling fans.
8. This step, along with step 9, checks for the ability of
the ECM to operate the cooling fans in re-
sponse to A/C pressure readings.
16. After confirming battery voltage and the ECM
supplying a ground to the coil side of the cooling fan
relay A, by jumpering connector terminals 30 and 87
it will be determined if the relay is at fault or a wiring
problem is present.
31. This step checks for the presence of battery voltage
to the main cooling fan when the A/C is on. If battery
voltage is present and the cooling fans are not oper-
ating, the problem is in the ground side of the cool-
ing fan circuit.
37. By directly grounding the ECM connector ter-
minals K28 and K12, the main and auxiliary cooling
fans should run at high speed.
Value(s)
–
Go to Step 2
–
Go to Step 3
–
Go to Step 4
–
Go to Step 5
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to
"Diagnostic
Aids"
Go to
"Diagnostic
Aids"
Go to Step 10