2004 DAEWOO NUBIRA display

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

ENGINE CONTROLS 1F – 549
DAEWOO V–121 BL4
DTC P1171 – Fuel Trim Supply System Lean During Power
Enrichment
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the system check complete?–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 component related Diagnostic Trouble
Codes (DTCs) set?–Go to
applicable DTC
tableGo to Step 3
31. Check the vehicle for an adequate amount of
fuel.
2. Add fuel to the vehicles fuel tank if the tank is
almost empty.
Did the fuel tank require fuel?–Go to Step 5Go to Step 4
41. Using a scan tool, observe the Front Heated
Oxygen Sensor (HO2S1) voltage while acceler-
ating the engine over 1200 rpm.
2. The HO2S1 voltage should vary from specified
voltage (100––900 mV) and occasionally toggle
above the specified voltage while accelerating.
Is the HO2S1 voltage toggle?3507 mVGo to
”Fuel System
Diagnosis”Go to
”DTC P0134
Oxygen Sensor
No Activity”
51. 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 6Go to Step 2
6Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
Applicable DTC
tableSystem OK

ENGINE CONTROLS 1F – 551
DAEWOO V–121 BL4
DTC P1336 – 58X Crank Position Tooth Error Not Learned
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the system check complete?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Turn the ignition OFF.
2. Install a scan tool to the Data Link Connector
(DLC).
3. Put the vehicle in PARK or NEUTRAL.
4. Start the engine and operate to normal operat-
ing temperature.
5. Turn all accessories OFF.
6. Enable the TEC (Tooth Error Correction)
LEARN PROCEDURE with the scan tool.
7. Raise the engine rpm to the specified value,
then release the throttle as soon as the engine
cuts out.
Does the scan tool indicate that the Crankshaft Posi-
tion (CKP) system variation has been learned?65°C (149°F)
4000 rpmGo to Step 5Go to Step 3
3Attempt the CKP system variation procedure as
many times as the specified value.
Does the scan tool indicate that the CKP system
variation has been learned?10Go to Step 5Go to Step 4
4Check for a problem with the CKP sensor to crank-
shaft relationship.
Is the repair complete?–Go to Step 5–
51. Turn the ignition OFF and wait above specified
value.
2. Turn the ignition ON, with engine OFF.
3. Using the scan tool, clear the Diagnostic
Trouble Codes (DTCs).
4. Start the engine and idle at normal operating
temperature.
5. Operate the vehicle within the conditions for
setting this DTC as supported in the text.
Does the scan tool indicate that this diagnostic ran
and passed?10 secGo to Step 6Go to Step 2
6Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
Applicable DTC
tableSystem OK

1F – 552IENGINE CONTROLS
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1391
G SENSOR ROUGH ROAD RATIONALITY
Circuit Description
TThe Gravity Sensing Rough Road (G) sensor is a vertical
low g–acceleration sensor. By sensing vertical accelera-
tion caused by bumps or potholes in the road, the Engine
Control Module (ECM) can determine if the changes in
crankshaft speed are due to engine misfire or are driveline
induced. If the G sensor detects a rough road condition,
the ECM misfire detection diagnostic will be de–activated.
The G sensor at rest output should be between 2.35–2.65
volts (+1G). During a rough road condition, the voltage
output can vary between 0.5 (–1G) and 4.5 volts (+3G).
Conditions for Setting the DTC
S Engine is running.
S Vehicle speed is less than or equal to 5 km/h (3.1
mph).
S G sensor output at idle indicates below –0.39 volts
or above 2.21 volts.
OR
S Engine is running more than 10 seconds and ve-
hicle speed is between 30 mph (50 km/h) and 70
mph (112 km/h).
S G sensor signal changes less than 0.00024 volts
while driving.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will not 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.Conditions for Clearing the MIL/DTC
S A history Diagnostic Trouble Code (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
Check for the following conditions:
S Poor connection at the ECM – Inspect the harness
connections for backed–out terminals, improper
mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal–to–wire connec-
tion.
S Damaged harness –– Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the G sensor display on the scan tool while moving
connectors and wiring harnesses related to the sen-
sor. A change in the display will indicate the loca-
tion of the fault.
Since the G sensor shares the ECM 5 volt reference and
ground terminals with the A/C Pressure Sensor, a dam-
aged A/C Pressure Sensor harness or sensor could cause
a G sensor DTC to set. Refer to ”Multiple ECM Information
Sensor DTCs Set” in this section. in this section.
The G sensor will give correct voltages only if it is level and
mounted securely to its bracket.
Reviewing the Failure Records 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 con

ENGINE CONTROLS 1F – 553
DAEWOO V–121 BL4
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. The On–Board Diagnostic (EOBD) System Checkprompts 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.
DTC P1391 – G Sensor Rough Road Rationality
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the system check complete?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Turn the ignition ON, with engine OFF.
2. Install a scan tool to the Data Link Connector
(DLC).
3. Review and record the scan tool Failure Re-
cords data.
4. Operate the vehicle within Failure Records
conditions as noted.
5. Using the scan tool, monitor specific Diagnostic
Trouble Code (DTC) info for DTC P1391.
Does the scan tool indicate that DTC P1391 failed?–Go to Step 4Go to Step 3
3Check for the following conditions and repair as
needed:
S G sensor seal missing or damaged.
S G sensor mounting flanges cracked, missing,
or incorrectly installed.
Is the repair complete?–Go to Step 14Go to
”Diagnostic
Aids”
41. Turn the ignition OFF.
2. Disconnect the G sensor electrical connector.
3. Turn the ignition ON, with the engine OFF.
4. Observe the G sensor value displayed on the
scan tool.
Is the G sensor value near the specified value?0 vGo to Step 5Go to Step 12
51. Jumper the 5 volt reference circuit, terminal A
and the G sensor signal circuit, terminal B to-
gether at the G sensor harness connector.
2. Observe the G sensor value displayed on the
scan tool.
Is the G sensor value near the specified value?4.95 vGo to Step 6Go to Step 7
61. Turn the ignition OFF.
2. Disconnect the Engine Control Module (ECM)
and check the sensor ground circuit for high
resistance, an open between the ECM and the
G sensor, or for a poor connection at the termi-
nal k34 of the ECM and repair as needed.
3. f the problem is found, repair as necessary.
Is a problem found?–Go to Step 14Go to Step 10
7Check the 5 volt reference circuit for high resistance,
an open between the ECM and the G sensor, or a
poor connection at the terminal k50 of the ECM and
repair as needed.
Is the repair complete?–Go to Step 14Go to Step 8

1F – 554IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
81. Turn the ignition OFF.
2. Disconnect the ECM and check the G sensor
signal circuit for high resistance, an open, a
short to ground, or a short to the sensor ground
circuit and repair as needed.
Is the repair complete?–Go to Step 14Go to Step 9
9Check the G sensor signal circuit for a poor connec-
tion at the ECM and repair as needed.
Is the repair complete?–Go to Step 14Go to Step 13
10Check for a poor connection at terminal C of the G
sensor and repair as needed.
Is the repair complete?Go to Step 14Go to Step 11
11Replace the G sensor.
Is the repair complete?–Go to Step 14–
121. Turn the ignition OFF.
2. Disconnect the ECM.
3. Turn the ignition ON.
4. Check the G sensor signal circuit for a short to
voltage or a short to the 5 volt reference circuit
and repair as needed.
Is the repair complete?–Go to Step 14Go to Step 13
131. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 14–
141. Using the scan tool, clear the 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 ran
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

ENGINE CONTROLS 1F – 555
DAEWOO V–121 BL4
DIAGNOSTIC TROUBLE CODE (DTC) P1392
G SENSOR ROUGH ROAD LOW VOLTAGE
Circuit Description
The Gravity Sensing Rough Road (G) sensor is a vertical
low g–acceleration sensor. By sensing vertical accelera-
tion caused by bumps or potholes in the road, the Engine
Control Module (ECM) can determine if the changes in
crankshaft speed are due to engine misfire or are driveline
induced. If the G sensor detects a rough road condition,
the ECM misfire detection diagnostic will be de–activated.
The G sensor at rest output should be between 2.35–2.65
volts (+1G). During a rough road condition, the voltage
output can vary between 0.5 (–1G) and 4.5 volts (+3G).
Conditions for Setting the DTC
S G sensor output is less than 2%.
S Engine is running more than or equal to 10 sec-
onds.
Action Taken When the DTC Sets
S The Malfunction Indicator Lamp (MIL) will not 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.
Conditions for Clearing the MIL/DTC
S A history Diagnostic Trouble Code (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
Check for the following conditions:S Poor connection at the ECM – Inspect the harness
connections for backed–out terminals, improper
mating, broken locks, improperly formed or dam-
aged terminals, and poor terminal–to–wire connec-
tion.
S Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the G sensor display on the scan tool while moving
connectors and wiring harnesses related to the sen-
sor. A change in the display will indicate the loca-
tion of the fault.
Since the G sensor shares the ECM 5 volt reference and
ground terminals with the A/C Pressure Sensor, a dam-
aged A/C Pressure Sensor harness or sensor could cause
a G sensor DTC to set. Refer to ”Multiple ECM Information
Sensor DTCs Set” in this section.
The G sensor will give correct voltages only if it is level and
mounted securely to its bracket.
Reviewing the Failure Records 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
The number(s) below refer to step(s) on the diagnostic
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 – 556IENGINE CONTROLS
DAEWOO V–121 BL4
DTC P1392 – G Sensor Rough Road Low Voltage
StepActionValue(s)YesNo
1Perform an On–Board Diagnostic (EOBD) System
Check.
Is the system check complete?–Go to Step 2Go to
”On–Board
Diagnostic Sys-
tem Check”
21. Turn the ignition OFF.
2. Install a scan tool to the Data Link Connector
(DLC).
3. Turn the ignition ON, with the engine OFF.
4. Observe the ROUGH ROAD value displayed
on the scan tool.
Is the ROUGH ROAD value near the specified val-
ue?0 vGo to Step 4Go to Step 3
31. Review and record the scan tool Failure Re-
cords data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using the scan tool, monitor specific Diagnostic
Trouble Code (DTC) info for DTC P1392.
Does the scan tool indicate that DTC P1392 failed?–Go to Step 4Go to
”Diagnostic
Aids”
41. Turn the ignition OFF.
2. Disconnect the G sensor electrical connector.
3. Turn the ignition ON, with the engine OFF.
4. Jumper the 5 volt reference circuit, terminal A
and the G sensor signal circuit, terminal B to-
gether at the G sensor harness connector.
5. Observe the G sensor value displayed on the
scan tool.
Is the G sensor value near the specified value?4.95 vGo to Step 9Go to Step 5
51. Turn the ignition OFF.
2. Disconnect the Engine Control Module (ECM)
and check the 5 volt reference circuit for an
open or short to ground and repair as needed.
Is the repair complete?–Go to Step 11Go to Step 6
6Check the 5 volt reference circuit for poor connection
at the ECM and repair or replace as needed.
Is the repair complete?–Go to Step 11Go to Step 7
71. Turn the ignition OFF.
2. Disconnect the ECM and check the G sensor
signal circuit for an open, a short to ground, or
a short to the sensor ground circuit and repair
as needed.
Is the repair complete?–Go to Step 11Go to Step 8
8Check the G sensor signal circuit for a poor connec-
tion at the ECM and repair as needed.
Is the repair complete?–Go to Step 11Go to Step 10
9Replace the G sensor.
Is the repair complete?–Go to Step 11–
101. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 11–