Dtc P0125 Engine Coolant Temperature (Ect) Insufficient For Closed Loop Fuel Control - Daewoo CIELO EURO III Manual

1F – 145 ENGINE CONTROLS

DTC P0125 Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control

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Step
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Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
1. Allow the engine to cool fully to ambient
temperature.
2. Turn the ignition switch ON, with the engine OFF
and Install a scan tool.
2
3. Compare the Engine Coolant Temperature (ECT)
sensor reading to the Intake Air Temperature
(IAT) sensor readings.
Are the temperature readings close?
1. Turn the ignition OFF.
2. Disconnect the ECT sensor electrical connector.
3. Turn the ignition ON, engine OFF.
4. Using a Digital Voltmeter (DVM), measure the
resistance across the ECT sensor terminals A
3
and B.
5. Check the ECT sensor value to actual coolant
temperature using the Temperature vs.
Resistance table.
Does the ECT sensor accurately reflect the actual
engine coolant temperature?
1. Turn the ignition OFF.
2. Disconnect the ECT sensor electrical connector.
4
3. Turn the ignition ON, engine OFF.
Is the ECT sensor value less than the specified val-
ue?
Jumper the ECT sensor signal circuit terminal B and
the sensor ground circuit terminal A together at the
ECT sensor connector.
5
Is the ECT sensor value greater than the specified
value?
Check for proper cooling system operation and re-
pair as necessary.
6
Is the repair complete?
Check the ECT sensor electrical connector terminals
A and B and Engine Control Module (ECM)
electrical connector terminals
7
M28 and M64 for poor connectors
or malfunctioning terminals and repair as necessary.
Is the repair complete?
Check the ECT sensor signal circuit for an open or
short to ground and repair as necessary.
8
Is the repair complete?
Check the ECT ground circuit for an open and repair
as necessary.
9
Is the repair complete?
1. Turn the ignition OFF.
10 2. Replace the ECM.
Is the repair complete?
Action
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Value(s) Yes
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–
Go to Step 2
–
Go to Step 4
Refer to
"Temperature
vs Resistance
Table" Go to Step 4
-30 C
(-22 F) Go to Step 5
130 C
(266 F) Go to Step 6
–
Go to Step 12
–
Go to Step 12
–
Go to Step 12
–
Go to Step 12
–
Go to Step 12
Á Á Á Á Á Á
No
Á Á Á Á Á Á
Go to
"On-Board
Diagnostic
System Check"
Go to Step 3
Go to Step 11
Go to Step 8
Go to Step 7
Go to
"Diagnostic
Aids"
Go to Step 8
Go to Step 9
Go to Step 10
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DAEWOO T-154 BL2,3