2004 DAEWOO NUBIRA Service Repair Manual

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Page 609 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual ENGINE CONTROLS 1F – 363
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0118
ENGINE COOLANT TEMPERATURE HIGH VOLTAGE
Circuit Description
The Engine Coolant Temperature (ECT) sensor uses a
thermi

ENGINE CONTROLS 1F – 363
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0118
ENGINE COOLANT TEMPERATURE HIGH VOLTAGE
Circuit Description
The Engine Coolant Temperature (ECT) sensor uses a
thermistor to control the signal voltage to the Engine Con-
trol Module (ECM). The ECM supplies a 5 volt reference
and a ground to the sensor. When the engine coolant is
cold, the resistance is high; therefore the ECT signal volt-
age will be high. If the engine coolant is warm, sensor re-
sistance becomes less; therefore the IAT signal voltage
drops. At normal engine operating temperature, the volt-
age will be between 1.5 to 2.0 volts at the ECT signal termi-
nal.
The ECT sensor is used to control following items:
S Fuel delivery.
S Ignition.
S Evaporative Emission (EVAP) canister purge valve.
S Idle Air Control (IAC) valve.
S Electric cooling fan.
Conditions for Setting the DTC
S ECT is less than –38°C (–36°F).
S Engine run time is greater than 90 seconds.
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 Both cooling fans turns on.
S The ECM will default to 20 °C (68 °F) for engine
coolant temperature for the first 60 seconds of en-
gine run time and then 92 °C (198 °F). 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
Normal operating temperature for the engine cooling sys-
tem is between 90°C(194°F) and 95°C(203°F).
Use the Temperature vs. Resistance Values table to eval-
uate the possibility of a skewed sensor. Refer to”Tempera-
ture vs. Resistance” in this section.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Table.
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
4. This step simulates a DTC P0117 condition. If the
ECM senses the change, then the ECM and the
ECT wiring are OK.
11. The replacement ECM must be reprogrammed.
Refer to the latest Techline procedure for ECM re-
programming.

Page 610 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual 1F – 364IENGINE CONTROLS
DAEWOO V–121 BL4
DTC P0118 – Engine Coolant Temperature High Voltage
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Was the check perform

1F – 364IENGINE CONTROLS
DAEWOO V–121 BL4
DTC P0118 – Engine Coolant Temperature High Voltage
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Was the check performed?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Install a scan tool to the Data Link Connector
(DLC).
2. Turn the ignition ON.
Is the engine Coolant Temperature (ECT) value less
than the specified value?–30 °C
(–22 °F)Go to Step 4Go to Step 3
31. Turn the ignition switch ON with the engine
OFF, review Freeze Frame data, and note the
parameters.
2. Operate the vehicle within the Freeze Frame
conditions and Conditions for Setting The DTC
as noted.
Is the ECT sensor value less than the specified val-
ue?–30 °C
(–22 °F)Go to Step 4Go to
”Diagnostic
Aids”
41. Turn the ignition switch OFF.
2. Disconnect the ECT sensor connector.
3. Turn the ignition switch ON.
4. Jumper the ECT sensor signal circuit terminal
1 and ground circuit terminal 2.
Is the ECT sensor value greater than the specified
value?130 °C
(266 °F)Go to Step 6Go to Step 5
5Jumper the ECT sensor signal circuit at terminal 1
to ground.
Is the ECT sensor value greater than the specified
value?130 °C
(266 °F)Go to Step 7Go to Step 8
6Check for a poor connection at the ECT sensor con-
nector and repair or replace any malfunctioning ter-
minal as needed.
Is the repair complete?–Go to Step 12Go to Step 10
7Check the ECT sensor ground circuit for an open
and repair as needed.
Is the repair complete?–Go to Step 12Go to Step 9
8Check the ECT sensor signal circuit for an open and
repair as needed.
Is the repair complete?–Go to Step 12Go to Step 9
9Check for a poor ECT sensor ground circuit at termi-
nal M64 or a poor ECT sensor signal circuit terminal
M28 connection at Engine Control Module (ECM)
and repair as needed.
Is the repair complete?–Go to Step 12Go to Step 11
10Replace the ECT sensor.
Is the repair complete?–Go to Step 12–
111. Turn the ignition OFF.
2. Replace the ECM.
Is the action complete?–Go to Step 12–

Page 611 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual ENGINE CONTROLS 1F – 365
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
121. Using the scan tool, clear the Diagnostic
Trouble Codes(DTVCs.)
2. Start the engine and idle at normal operating
temper

Page 612 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual 1F – 366IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0122
THROTTLE POSITION SENSOR LOW VOLTAGE
Circuit Description
The Engine Control Module (ECM) supplies a 5 volt refer-
ence

1F – 366IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0122
THROTTLE POSITION SENSOR LOW VOLTAGE
Circuit Description
The Engine Control Module (ECM) supplies a 5 volt refer-
ence voltage signal and a ground to the Throttle Position
(TP) sensor. The TP sensor sends a voltage signal back
to the ECM relative to the throttle plate opening. The volt-
age signal will vary from approximately 0.33 volts at closed
throttle, to over 4.3 volts at Wide Open Throttle (WOT).
The TP signal is used by the ECM for fuel control and for
most of the ECM controlled outputs. The TP signal is one
of the most important inputs used by the ECM for fuel con-
trol and most of the ECM controlled outputs.
Conditions for Setting the DTC
S TP sensor voltage indicates a throttle voltage less
than 0.14 volts.
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 TP angle will default to 0% when the vehicle
speed is less than 3 km/h (2 mph) and 10% when
the vehicle speed is greater than 3 km/h (2 mph).
The scan tool will not display the default 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
If the DTC P0122 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful. Use a scan
tool information data to determine the status of the DTC.
If the dc occurs intermittently, using the Diagnostic table
may help isolate the problem.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Table.
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
2. The TP sensor has an auto zeroing feature. If the
voltage reading is between 0.2 to 0.9 volts, the
ECM will assume the TP sensor is at a closed
throttle position (0%).
5. Simulates a high voltage signal which will identify
an open in the signal circuit.
6. If additional DTCs are set, check the 5v reference
circuits for a short to ground.
8. If the test light illuminates while probing the TP sig-
nal circuit, then the TP signal circuit is shorted to
ground.
11. The replacement ECM must be reprogrammed.
Refer to the latest Techline procedure for ECM re-
programming.

Page 613 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual ENGINE CONTROLS 1F – 367
DAEWOO V–121 BL4
13. If no faults have been found at this point and no
additional DTCs were set, refer to ”Diagnostic
Aids”for additional checks and information.
DTC

ENGINE CONTROLS 1F – 367
DAEWOO V–121 BL4
13. If no faults have been found at this point and no
additional DTCs were set, refer to ”Diagnostic
Aids”for additional checks and information.
DTC P0122 – Throttle Position Sensor Low Voltage
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Was the check performed?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Install a scan tool to the Data Link Connector
DLC).
2. Turn the ignition ON.
Is the Throttle Position (TP) sensor voltage below
the specified value?0.20 VGo to Step 4Go to Step 3
31. Turn the ignition ON.
2. Review the Freeze Frame data and note the
parameters.
3. Operate the vehicle within the Freeze Frame
conditions and Conditions for Setting the DTC
as noted.
Is the TP sensor voltage below the specified value?0.20 VGo to Step 4Go to Step 12
41. Turn the ignition OFF.
2. Disconnect the TP sensor connector.
3. Turn the ignition ON.
4. Jump the 5 volt reference circuit terminal 2 and
the TP signal circuit terminal 3 at the TP sen-
sor connector.
Is the TP sensor voltage over the specified value?4.0 VGo to Step 10Go to Step 5
5Connect a test light between B+ and the TP sensor
signal circuit terminal 3.
Is the TP sensor voltage greater than the specified
value?4.0 VGo to Step 6Go to Step 8
6Check the TP sensor 5 volt reference circuit for an
open or short to ground and repair as needed.
Is the repair complete?–Go to Step 12Go to Step 7
7Check the 5 volt reference circuit for a poor connec-
tion at terminal M32 of the Engine Control Module
(ECM) and repair as needed.
Is a repair necessary?–Go to Step 12Go to Step 11
8Check the TP sensor signal circuit between terminal
C of the TP sensor and terminal M6 of the ECM for
an open or a short to ground and repair as needed.
Is the repair complete?–Go to Step 12Go to Step 9
9Check the TP sensor signal circuit, terminal M6 of
the ECM for a poor connection and repair as need-
ed.
Is the repair complete?–Go to Step 12Go to Step 11
10Replace the TP sensor.
Is the action complete?–Go to Step 12–
111. Turn the ignition OFF.
2. Replace the ECM.
Is the action complete?–Go to Step 12–

Page 614 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual 1F – 368IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
121. Using the scan tool, clear the Diagnostic
Trouble Codes (DTCs).
2. Start the engine and idle at normal operating
tempera

Page 615 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual ENGINE CONTROLS 1F – 369
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0123
THROTTLE POSITION SENSOR HIGH VOLTAGE
Circuit Description
The Engine Control Module (ECM) supplies a 5 volt refer-
en

ENGINE CONTROLS 1F – 369
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P0123
THROTTLE POSITION SENSOR HIGH VOLTAGE
Circuit Description
The Engine Control Module (ECM) supplies a 5 volt refer-
ence voltage signal and a ground to the Throttle Position
(TP) sensor. The TP sensor sends a voltage signal back
to the ECM relative to the throttle plate opening. The volt-
age signal will vary from approximately 0.33 volts at closed
throttle, to over 4.3 volts at Wide Open Throttle (WOT).
The TP signal is used by the ECM for fuel control and for
most of the ECM controlled outputs. The TP signal is one
of the most important inputs used by the ECM for fuel con-
trol and most of the ECM controlled outputs.
Conditions for Setting the DTC
S TP sensor voltage indicates a throttle voltage great-
er than 4.9 volts.
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 TP angle will default to 0% when the vehicle
speed is less than 3 km/h (2 mph) and 10% when
the vehicle speed is greater than 3 km/h (2 mph).
The scan tool will not display the default 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
If the DTC P0123 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful. Use a scan
tool information data to determine the status of the DTC.
If the dc occurs intermittently, using the Diagnostic table
may help isolate the problem.
With ignition ON and the throttle at closed position, the
voltage should read between 0.2 and 0.90 volts and in-
crease steadily to over 4.3 volts at WOT.
DTCs P0123 and P0113 stored at the same time could be
result of an open sensor ground circuit.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Table.
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
2. With the throttle closed, the TP sensor voltage
should read less than 0.90 volts. If the TP sensor
voltage does not read less than 0.90 volts check for
a binding or sticking throttle cable.
4. With the TP sensor disconnected, the TP sensor
voltage should be less than 0.2 volts if the ECM
and wiring are OK.
5. Probing the ground circuit with a test light checks
the circuit for high resistance which will cause a
DTC P0123 to set.

Page 616 of 2643

DAEWOO NUBIRA 2004 Service Repair Manual 1F – 370IENGINE CONTROLS
DAEWOO V–121 BL4
7. A shorted 5 volt reference circuit will also set addi-
tional DTCs.
11. The replacement ECM must be reprogrammed.Refer to the latest Techline procedure

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