2004 DAEWOO LACETTI Service Repair Manual

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Page 369 of 2643

DAEWOO LACETTI 2004 Service Repair Manual ENGINE CONTROLS 1F – 123
DAEWOO V–121 BL4
DTC P0113 – Intake Air Temperature Sensor High Voltage
StepActionValue(s)YesNo
1Perform an Euro On–Board Diagnostic (EOBD)
System Check.
Is the syste

ENGINE CONTROLS 1F – 123
DAEWOO V–121 BL4
DTC P0113 – Intake Air Temperature Sensor High Voltage
StepActionValue(s)YesNo
1Perform an Euro On–Board Diagnostic (EOBD)
System Check.
Is the system check complete?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Connect the scan tool to the data link connec-
tor (DLC).
2. Run the engine unit it reaches operating tem-
perature.
Does the scan tool show the intake air temperature
(IAT) sensor reading within the value specified?15~80°C
(10~176°F)Go to
”Diagnostic
Aids”Go to Step 3
31. Turn the ignition switch to LOCK.
2. Disconnect the IAT sensor connector.
3. Jumper to IAT sensor connector terminals.
4. Turn the ignition switch to ON.
Does the scan tool show the IAT sensor reading the
value specified?180°C
(356°F)Go to Step 4Go to Step 5
4Check for a faulty connector or terminals 1 and 2 of
the IAT sensor connector.
Is the problem found?–Go to Step 10Go to Step 9
5Measure the voltage between terminals 1 and 2 of
IAT sensor connector.
Does the voltage measure within the value speci-
fied?4.5~5.5VGo to Step 11Go to Step 6
6Measure the voltage between the IAT sensor con-
nector terminal 2 and the battery ground(negative)
post.
Does the voltage measure within the value speci-
fied?4.5~5.5VGo to Step 7Go to Step 8
71. Turn the ignition switch to LOCK.
2. Check for an open or short to battery voltage in
the wire between the IAT sensor connector ter-
minal 2 and the engine control module(ECM)
connector terminal 13.
Is the problem found?–Go to Step 10Go to Step 11
81. Turn the ignition switch to LOCK.
2. Check for an open or short to battery voltage in
the wire between the IAT sensor connector ter-
minal 1 and the ECM connector terminal 78.
Is the problem found?–Go to Step 10Go to Step 11
91. Turn the ignition switch to LOCK.
2. Replace the IAT sensor.
3. Clear any DTCs from the ECM.
4. Perform the diagnostic system check.
Is the repair complete?–System OK–
101. Turn the ignition switch to LOCK.
2. Repair the wire of the connector terminals as
needed.
3. Clear any DTCs from the ECM.
4. Perform the diagnostic system check.
Is the repair complete?–System OK–

Page 370 of 2643

DAEWOO LACETTI 2004 Service Repair Manual 1F – 124IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
111. Replace the ECM.
2. Perform the diagnostic system check.
Is the repair complete?–Go to Step 12–
12Check if any addit

Page 371 of 2643

DAEWOO LACETTI 2004 Service Repair Manual ENGINE CONTROLS 1F – 125
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0117
ENGINE COOLANT TEMPERATURE SENSOR LOW
VOLTAGE
Circuit Description
The Engine Coolant Temperature sensor (ECT) uses a

ENGINE CONTROLS 1F – 125
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0117
ENGINE COOLANT TEMPERATURE SENSOR LOW
VOLTAGE
Circuit Description
The Engine Coolant Temperature sensor (ECT) uses a
thermistor to control the signal voltage to the engine con-
trol module (ECM).
The ECM supplies a voltage on the signal circuit to the
sensor. When the engine coolant is cold, the resistance is
high; therefore the ECT signal voltage will be high.
As the engine warms, the sensor resistance becomes
less, and the voltage drops. At normal engine operating
temperature, the voltage will be between 1.5 and 2.0 volts
at the ECT signal terminal.
The ECT sensor is used to the following items:
S Fuel delivery.
S Lock Up Clutch (LUC).
S Ignition.
S Evaporative Emission (EVAP) Canister Purge
Valve.
S Electric cooling fan.
Conditions for Setting the DTC
S ECT voltage is less than 0.03V.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will illumi-
nate.S The ECM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Freeze Frame and Failure Records
buffers.
S A history DTC is stored.
S The coolant fan turns ON.
S The ECM will default to 20°C (68°F) for the first 60
seconds of the engine run time, and then 92 °C
(198 °F).
S The scan tool will not show the defaulted value.
Conditions for Clearing the MIL/DTC
S The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault.
S A history DTC will clear after 40 consecutive warm–
up cycles without a fault.
S DTC(s) can be cleared by using the scan tool.
S Disconnecting the ECM battery feed for more than
10 seconds.
Diagnostic Aids
After the engine has started, the ECT should rise steadily
to about 90°C (194°F) then stabilize when the thermostat
opens.
Use the temperature vs. Resistance values table to evalu-
ate the possibility of a skewed sensor. Refer to ”Tempera-
ture vs. Resistance” in this section.

Page 372 of 2643

DAEWOO LACETTI 2004 Service Repair Manual 1F – 126IENGINE CONTROLS
DAEWOO V–121 BL4
DTC P0117 – Engine Coolant Temperature Sensor Low Voltage
StepActionValue(s)YesNo
1Perform an Euro On–Board Diagnostic (EOBD)
System Check.
Is the sys

Page 373 of 2643

DAEWOO LACETTI 2004 Service Repair Manual ENGINE CONTROLS 1F – 127
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
91. Replace the ECM.
2. Run the engine until it reaches operating tem-
perature.
3. Perform the diagnostic system check.
Is

Page 374 of 2643

DAEWOO LACETTI 2004 Service Repair Manual 1F – 128IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0118
ENGINE COOLANT TEMPERATURE SENSOR HIGH
VOLTAGE
Circuit Description
The coolant temperature sensor (ECT) uses a thermis

Page 375 of 2643

DAEWOO LACETTI 2004 Service Repair Manual ENGINE CONTROLS 1F – 129
DAEWOO V–121 BL4
DTC P0118 – Engine Coolant Temperature Sensor High Voltage
StepActionValue(s)YesNo
1Perform an Euro On–Board Diagnostic (EOBD)
System Check.
Is the s

Page 376 of 2643

DAEWOO LACETTI 2004 Service Repair Manual 1F – 130IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
91. Replace the ECM.
2. Run the engine until it reaches operating tem-
perature.
3. Perform the diagnostic system check.
Is

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