2004 DAEWOO NUBIRA fuel

ENGINE CONTROLS 1F – 535
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1121
THROTTLE POSITION SENSOR INTERMITTENT HIGH
VOLTAGE
Circuit Description
The Throttle Position (TP) sensor circuit provides a volt-
age signal that changes relative to throttle blade angle.
The TP sensor sends a voltage signal back to the Engine
Control Module (ECM) relative to the throttle plate open-
ing. The voltage 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. If the ECM
detects a TP signal that is intermittently above the range
of the TP sensor, Diagnostic Trouble Code (DTC) P1121
will be set.
Conditions for Setting the DTC
S TP sensor voltage indicates a throttle voltage inter-
mittently greater than 4.9 volts.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
S The ECM will store conditions which were present
when the DTC set as Failure Records data only.
This information will not be stored as Freeze Frame
data.
S A history DTC is stored.
Conditions for Clearing the MIL/DTC
S A history will clear after 40 consecutive warm–up
cycles in which the diagnostic runs 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
Check for the following conditions:
S Poor connection at the ECM. Inspect harness con-
nectors for backed–out terminals, improper mating,
broken locks, improperly formed or damaged termi-
nals, and poor terminal–to–wire connection.
S Damaged harness. Inspect the wiring harness for
damage. If the harness appears OK, observe the
throttle position display on the scan tool while mov-
ing connectors and wiring harnesses related to the
TP sensor. A change in the display will indicate the
location of the fault.
If DTC P1121 cannot be duplicated, reviewing the Fail Re-
cords vehicle mileage since the diagnostic test last failed
may help determine how often the condition that caused
the DTC to be set occurs. This may assist in diagnosing
the condition.
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.

ENGINE CONTROLS 1F – 537
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1122
THROTTLE POSITION SENSOR INTERMITTENT LOW
VOLTAGE
Circuit Description
The Throttle Position (TP) sensor circuit provides a volt-
age signal that changes relative to throttle blade angle.
The TP sensor sends a voltage signal back to the Engine
Control Module (ECM) relative to the throttle plate open-
ing. The voltage 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. If the ECM
detects a TP signal that is intermittently above the range
of the TP sensor, Diagnostic Trouble Code (DTC) P1122
will be set.
Conditions for Setting the DTC
S TP sensor voltage indicates a throttle voltage inter-
mittently less than 0.14 volts.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
S The ECM will store conditions which were present
when the DTC set as Failure Records data only.
This information will not be stored as Freeze Frame
data.
S A history DTC is stored.
Conditions for Clearing the MIL/DTC
S A history will clear after 40 consecutive warm–up
cycles in which the diagnostic runs 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
Check for the following conditions:
S Poor connection at the ECM. Inspect harness con-
nectors for backed–out terminals, improper mating,
broken locks, improperly formed or damaged termi-
nals, and poor terminal–to–wire connection.
S Damaged harness. Inspect the wiring harness for
damage. If the harness appears OK, observe the
throttle position display on the scan tool while mov-
ing connectors and wiring harnesses related to the
TP sensor. A change in the display will indicate the
location of the fault.
If DTC P1122 cannot be duplicated, reviewing the Fail Re-
cords vehicle mileage since the diagnostic test last failed
may help determine how often the condition that caused
the DTC to be set occurs. This may assist in diagnosing
the condition.
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.

1F – 540IENGINE CONTROLS
DAEWOO V–121 BL4
Diagnostic Aids
DTC P1133 is most likely caused by one of the following
items:
S Fuel Pressure – The system will go rich if the fuel
pressure is too high. The ECM can compensate for
some increase. However, if it gets too high, a DTC
P1133 may set. Refer to ”Fuel System Diagnosis”
in this section.
S Leaking injector – A leaking or malfunctioning injec-
tor can cause the system to go rich.
S Manifold Absolute Pressure (MAP) sensor – An
output that causes the ECM to sense a higher than
normal manifold pressure (low vacuum) can cause
the system to go rich. Disconnecting the MAP sen-
sor will allow the ECM to set a fixed value for the
MAP sensor. Substitute a different MAP sensor if
the rich condition is gone while the sensor is dis-
connected.
S Pressure regulator – Check for a leaking fuel pres-
sure regulator diaphragm by checking for the pres-
ence of liquid fuel in the vacuum line to the pres-
sure regulator.
S Throttle Position (TP) sensor – An intermittent TP
sensor output can cause the system to go rich due
to a false indication of the engine accelerating.S HO2S1 contamination – Inspect the HO2S1 for sili-
cone contamination from fuel or improper use of
Room Temperature Vulcanizing (RTV) sealant. The
sensor may have a white powdery coating and re-
sult in a high but false voltage signal (rich exhaust
indication). The ECM will then reduce the amount
of fuel delivered to the engine causing a severe
surge or driveability problem.
Test Description
Number(s) below refer to the step number(s) on the Diag-
nostic Chart.
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.
14. The replacement ECM must be reprogrammed.
Refer to the latest Techline procedure for ECM re-
programming.
16. If no malfunctions have been found at this point and
no additional DTCs are set, refer to ”Diagnostic
Aids” in this section for additional checks and infor-
mation.
DTC P1133 – Front Heated Oxygen Sensor (HO2S1) Too Few
Transition
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.
Are any additional Diagnostic Trouble Codes
(DTCs) set?–Go to
applicable DTC
tableGo to Step 3
31. Start the engine and idle at normal operating
temperature.
2. Operate the vehicle within the specified param-
eter under the Conditions For Setting the DTC.
3. Monitor the lean–to–rich transition and rich–to–
lean transition and note the number of
switches.
Does the parameter show fewer transitions than the
specified value within 90 seconds.15Go to Step 4Go to Step 18

ENGINE CONTROLS 1F – 541
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
4Visually/physically inspect for the following items:
S Front Heated Oxygen Sensor (HO2S1) is se-
curely installed.
S Corrosion on the terminals.
S Terminal tension.
S HO2S1 wiring harness for poor terminal con-
nection or damaged wiring.
Is a problem found in any of the above areas?–Go to Step 9Go to Step 5
5Check the exhaust manifold for a leak near the en-
gine and repair as needed.
Is the repair complete?–Go to Step 3Go to Step 6
61. Turn the ignition OFF.
2. Disconnect the HO2S1 connector.
3. Jumper the HO2S1 low circuit, terminal 3 to
ground.
4. Turn the ignition ON.
Does the scan tool indicate the voltage between the
specified value?400–500 mVGo to Step 7Go to Step 10
7Jumper the HO2S1 signal and low circuit terminal 4
to ground.
Does the scan tool indicate the voltage below the
specified value?200 mVGo to Step 8Go to Step 11
81. Turn the ignition OFF.
2. Replace the HO2S1.
Note : before replacing the sensor, the cause of the
contamination must be determined and corrected in
order to prevent further damage to the sensor.
Check for following:
S Fuel contamination.
S Use of improper Room Temperature Vulcaniz-
ing sealant.
S Engine oil/coolant consumption.
Is the repair complete?–Go to Step 15–
9Repair the condition as needed.
Is the repair complete?–Go to Step 15–
10Repair the HO2S1 signal circuit for a short to ground.
Is the repair complete?–Go to Step 15–
111. Remove the jumper wire.
2. Using voltmeter measure the voltage between
the HO2S1 signal circuit, terminal 4 and
ground.
Does the voltage above the specified value?407 mVGo to Step 12Go to Step 13
121. Turn the ignition OFF.
2. Disconnect the ECM connectors and check the
continuity between terminal 2 of HO2S1 and
the terminal M29 of the ECM.
3. If the circuit measures over the specified value,
repair open or poor connection as needed.
Is the repair complete?5 ΩGo to Step 15Go to Step 14

ENGINE CONTROLS 1F – 545
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
51. Turn the ignition OFF.
2. Disconnect the HO2S1 connector.
3. Turn the ignition ON.
4. Using a voltmeter, measure the voltage be-
tween following terminals.
5. Terminal 4 of Engine Control Module (ECM)
side HO2S1 connector and ground.
6. Terminal 3 of ECM side HO2S1 connector and
ground.
Are both voltages in the specified value?3–5 vGo to Step 6Go to Step 8
61. With the HO2S1 disconnected, jumper the
ECM side HO2S1 connector terminals 4 and 3.
2. Turn the ignition ON.
3. Using a scan tool, monitor the HO2S1 voltage.
Does the scan tool indicates less than 10 millivolts
and immediately return to about 450 millivolts when
the jumper is removed?–Go to Step 10Go to Step 9
7Repair conditions as needed.
Is the action complete?–Go to Step 14–
8Check for faulty ECM connections or terminal dam-
ages and repair as needed.
Is the repair complete?–Go to Step 14Go to Step 9
9Repair open, short, or grounded signal circuit.
Is the repair complete?–Go to Step 14Step 11
10Remove the HO2S1 and examine it for sign of:
S Fuel contamination.
S Improper room temperature vulcanizing sealant
(white powdery coating on the sensor)
S Engine oil/coolant consumption.
Are sign of contamination observed?–Go to Step 12Go to Step 13
111. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 14Go to Step 13
12Determine and correct the cause of contamination.
Is the repair complete?–Go to Step 14
13Replace the HO2S1.
Is the repair complete?–Go to Step 14–
141. Using the scan tool, clear the Diagnostic
Trouble Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?–Go to Step 15Go to Step 2
15Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
Applicable DTC
tableSystem OK

1F – 546IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1167
FRONT HEATED OXYGEN SENSOR (HO2S1) RICH IN
DECEL FUEL CUTOFF (DFCO)
Circuit Description
The Engine Control Module (ECM) supplies a voltage of
about 0.45 volts between terminals M12 and M29 (if mea-
sured with a 10 megohm digital voltmeter, this may read
as low as 0.32 volts). The Front Heated Oxygen Sensor
(HO2S1) varies the voltage within a range of about 1 volt
if the exhaust is rich, down through about 0.10 volts if the
exhaust is lean.
In internal circuitry of the Engine control Module (ECM)
can identify if the vehicle fuel system is capable of cutoff
amount of the fuel supply during deceleration. When a De-
cel Fuel Cutoff (DFCO) mode of operation is requested
during Closed Loop operation, the ECM will cutoff the fuel
supply to the engine. Under these conditions the ECM
should detect a lean condition. If the ECM detect a rich
condition at this time, Diagnostic Trouble Code (DTC)
P1167 will set. Damaged fuel pressure regulator and faulty
injector will be the cause of this DTC.
Conditions for Setting the DTC
S HO2S1 voltage is greater than 0.55 volts in Decel
Fuel Cutoff (DFCO) mode.
S System voltage is greater than 10 volts.S Engine Coolant Temperature (ECT) is greater than
60°C (140°F)
S DTCs P0106, P0107, P0108, P0117, P0118,
P0122, P0123, P0171, P0172, P0201, P0202,
P0203, P0204, P0300, P0336, P0337, P0351,
P0352, P0402, P0404, P0405, P0406, P0506,
P0507, P1404, and P0443 are not set.
S 3 second delay after in DFCO mode.
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 vehicle will operate in Open Loop.
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 can be cleared by using the scan tool.

ENGINE CONTROLS 1F – 547
DAEWOO V–121 BL4
S Disconnecting the ECM battery feed for more than
10 seconds.
Diagnostic Aids
The DTC P1167 or rich exhaust is most likely caused by
one of the following items:S Leaking injector – A leaking or malfunctioning injec-
tor can cause the system to go rich causing a DTC
P0132.
S Pressure regulator – Check for a leaking fuel pres-
sure regulator diaphragm by checking for the pres-
ence of liquid fuel in the vacuum line to the regula-
tor.
DTC P1167 – Front Heated Oxygen Sensor (HO2S1) Rich in Decel
Fuel Cutoff (DFCO)
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.
Any other component related Diagnostic Trouble
Codes (DTCs) set?–Go to
applicable DTC
tableGo to Step 3
31. Using a scan tool, observe the Front Heated
Oxygen Sensor (HO2S1) voltage while decel-
erating the engine.
2. The HO2S1 voltage should vary from specified
voltage (100–900 mV) and while decelerating
occasionally toggle below the specified voltage.
Is the HO2S1 voltage toggle?550 mVGo to Step 4Go to
”DTC P0134
Oxygen Sensor
No Activity”
4Check the items in ”Diagnostic Aids” and repair or re-
place component as needed. Refer to ”Fuel System
Diagnosis”.
Is the repair complete?–Go to Step 6Go to Step 5
51. Turn the ignition OFF.
2. Replace the Engine Control Module (ECM).
Is the repair complete?–Go to Step 6–
61. Using the scan tool, clear the Diagnostic
Trouble Codes (DTCs).
2. Start the engine and idle at normal operating
temperature.
3. Operate the vehicle within the Conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicate that this diagnostic has
run and passed?–Go to Step 7Go to Step 2
7Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
Applicable DTC
tableSystem OK

1F – 548IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1171
FUEL TRIM SYSTEM LEAN DURING POWER
ENRICHMENT
System Description
The internal circuitry of the Engine control Module (ECM)
can identify if the vehicle fuel system is capable of supply-
ing adequate amounts of fuel during heavy acceleration(
power enrichment). When a Power Enrichment (PE)
mode of operation is requested by heavy acceleration dur-
ing Closed Loop operation, the ECM will provide more fuel
to the engine. Under these conditions the ECM should de-
tect a rich condition. If this reich condition is nor detected
at this time, Diagnostic Trouble Code (DTC) P1171 will set.
A plugged fuel filter or restricted fuel line can prevent ade-
quate amount of fuel from being supplied during Power
Enrichment mode.
Conditions for Setting the DTC
S HO2S1 voltage is less than 0.35 volts in Power En-
richment (PE) mode.
S Engine is operating in Closed Loop and in PE
mode.
S Engine Coolant Temperature (ECT) is greater than
60°C (140°F).
S System voltage is greater than 10 volts.
S Air/Fuel ration is less than 13.5:1.
S DTCs P0106, P0107, P0108, P0117, P0118,
P0122, P0123, P0171, P0172, P0201, P0202,
P0203, P0204, P0300, P0336, P0337, P0351,
P0352, P0402, P0404, P0405, P0406, P0506,
P0507, P1404, and P0443 are not set.
S 3 second delay after in PE mode.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will illuminate
after two consecutive ignition cycle with a fail.
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 vehicle will operate in Open Loop.Conditions for Clearing the MIL/DTC
S The MIL will turn off after three 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.v
Diagnostic Aids
A restricted fuel filter can supply adequate amounts of fuel
at idle, but may not be able to supply enough fuel during
heavy acceleration.
Water or alcohol n fuel may cause low HO2S1 voltage dur-
ing acceleration.
Check for adequate amount of fuel in the Tank.
When the engine is idling or at steady cruise, the HO2S1
voltage should vary from between approximately a00 to
900 millivolts. During power enrichment mode, more fuel
is needed, and the HO2S1 should rise above 444 milli-
volts.
Check for faulty or plugged injector(s).
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 checks to see if the HO2S1 is operating
properly.
6. If no faults have been found at this point and no
additional DTCs were set, refer to ”Diagnostic Aids”
in this section for additional checks and informa-
tion.