2004 DAEWOO NUBIRA display

1F – 462IENGINE CONTROLS
DAEWOO V–121 BL4
1. The On–Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and to store the freeze frame and failure
records 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. This step determines if DTC P0342 is the result ofa hard failure or an intermittent condition.
4. Determines if voltage is available to the CMP.
7. This step checks for a voltage supplied by the ECM
to the CMP.
12. The replacement ECM must be reprogrammed.
Refer to the latest Techline procedure for ECM re-
programming.
DTC P0342 – Camshaft Position Sensor No Signal
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. Turn the ignition OFF.
2. Install a scan tool to the Data Link Connector
(DLC).
3. Idle the engine.
Is the Camshaft Position (CMP) Active Count incre-
menting?–Go to Step 3Go to Step 4
31. Turn the ignition ON.
2. Review the Freeze Frame data and note the
parameters.
3. Start the engine and operate the vehicle within
the Freeze Frame Conditions and Conditions
for Setting the DTC as noted.
Is the CMP Active Counter incrementing?–Go to Step 13Go to Step 4
41. Turn the ignition OFF.
2. Disconnect the CMP sensor connector.
3. Turn the ignition ON.
4. With a test light connected to ground, probe
the CMP sensor harness connector, terminal 1.
Does the test light illuminate?–Go to Step 5Go to Step 6
5With a test light connected to B+, probe the CMP
sensor harness connector, terminal 2.
Does the test light illuminate?–Go to Step 7Go to Step 8
6Check for a poor connection or open in the CMP sen-
sor B+ feed circuit and repair as necessary.
Is the repair complete?–Go to Step 13Go to
”Diagnostic
Aids”
7Using a Digital Voltmeter (DVM), check the voltage
between the CMP sensor harness connector, termi-
nal 3 and ground.
Does the DVM display near the specified values?5 VGo to Step 11Go to Step 9
8Check for a poor connection or open in the CMP sen-
sor ground circuit and repair as necessary.
Is the repair complete?–Go to Step 13–
91. Turn the ignition OFF.
2. Disconnect the engine Control Module (ECM)
connector.
3. Check for the CMP signal circuit for an open or
short to round or short to B+, and repair as
needed.
Is the repair complete?–Go to Step 13Go to Step 10

ENGINE CONTROLS 1F – 463
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
10Check the CMP signal circuit for an open or short to
ground and repair as needed.
Is the repair complete?–Go to Step 13Go to Step 12
111. Turn the ignition OFF.
2. Replace the CMP sensor.
Is the repair complete?–Go to Step 13–
121. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 13–
131. 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 supported in the text.
Does the scan tool indicate that this diagnostic ran
and passed?–Go to Step 14Go to Step 2
14Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
”Applicable
DTC table”System OK

ENGINE CONTROLS 1F – 465
DAEWOO V–121 BL4
S Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, discon-
nect the ECM, turn the ignition on, and observe a
voltmeter connected to the 58X reference circuit at
the ECM harness connector while moving connec-
tors and wiring harnesses related to the ECM. A
change in voltage will indicate the location of thefault.
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.
DTC P0351 – Ignition Control Circuit A Fault (Cylinder 1 and 4)
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”
2Check for a faulty connection or damaged terminal
C at the Electronic Ignition (EI) system ignition coil
and repair as needed.
Is the repair complete?–Go to Step 8Go to Step 3
3Check for a faulty connection or damaged terminal
M51/M35 at the Engine Control Module (ECM) and
repair as needed.
Is the repair complete?–Go to Step 8Go to Step 4
41. Ignition OFF.
2. Disconnect the ECM connector.
3. Check the ignition control circuit for a short to
ground and repair as needed.
Is the repair complete?–Go to Step 8Go to Step 5
5Check the ignition control circuit for a short to voltage
and repair as necessary.
Is the repair complete?–Go to Step 8Go to Step 6
6Check an open ignition control circuit and repair as
needed.
Is the repair complete?–Go to Step 8Go to Step 7
71. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 8–
81. 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 supported in the text.
Does the scan tool indicate that this diagnostic ran
and passed?–Go to Step 9Go to Step 2
9Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to applica-
ble DTC tableSystem OK

ENGINE CONTROLS 1F – 467
DAEWOO V–121 BL4
S Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, discon-
nect the ECM, turn the ignition on, and observe a
voltmeter connected to the 58X reference circuit at
the ECM harness connector while moving connec-
tors and wiring harnesses related to the ECM. A
change in voltage will indicate the location of thefault.
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.
DTC P0352 – Ignition Control Circuit B Fault (Cylinder 2 and 3)
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”
2Check for a faulty connection or damaged terminal
A at the Electronic Ignition (EI) system ignition coil
and repair as needed.
Is the repair complete?–Go to Step 8Go to Step 3
3Check for a faulty connection or damaged terminal
M33/M1 at the Engine Control Module (ECM) and
repair as needed.
Is the repair complete?–Go to Step 8Go to Step 4
41. Turn the ignition OFF.
2. Disconnect the ECM connector.
3. Check the ignition control circuit for a short to
ground and repair as needed.
Is the repair complete?–Go to Step 8Go to Step 5
5Check the ignition control circuit for a short to voltage
and repair as needed.
Is the repair complete?–Go to Step 8Go to Step 6
6Check for an open in the ignition control circuit and
repair as needed.
Is the repair complete?–Go to Step 8Go to Step 7
71. Turn the ignition OFF.
2. Replace the ECM.
Is the repair complete?–Go to Step 8–
81. 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 supported in the text.
Does the scan tool indicate that this diagnostic ran
and passed?–Go to Step 9Go to Step 2
9Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to applica-
ble DTC tableSystem OK

ENGINE CONTROLS 1F – 469
DAEWOO V–121 BL4
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. Commanding the EGR valve open determines
whether the EGR system is totally restricted or par-
tially restricted.
3. Visually and physically inspect the EGR passages
and valve for excessive carbon deposits or dam-
age.
4. Be sure all gasket material is removed from the
EGR mounting surface. Even a small amount of
material may cause a DTC P0401 to set.
5. This step verifies if the fault is present and also ver-
ifies if a repair corrected the problem. If the EGR
Deceleration Filter value stays near 0 or a positivenumber after several tests have been run, then a
small restriction may still exist. Be sure to check the
EGR pipe for damage or dents and the EGR valve
for any excessive carbon build up. Only 1 test per
ignition cycle will run unless a DTC P0401 has
been cleared or the battery has been disconnected.
6. Clearing DTCs is a very important step for this
diagnostic. The clearing function allows the EGR
valve to relearn a new pintle position as the old
pintle position was inaccurate due to the failure that
caused the DTC. The DTC must be cleared with
the ignition ON, engine OFF or when the engine is
idling. If the ECM sees a EGR command, the new
pintle will not be learned.
DTC P0401 – Exhaust Gas Recirculation Insufficient Flow
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. Start the engine and allow the engine to idle.
3. Command the Exhaust Gas Recirculation
(EGR) valve to the specific value.
Does the engine stall or attempt to stall?50%Go to Step 5Go to Step 3
31. Turn the ignition OFF.
2. Disconnect the EGR valve connector and re-
move the EGR valve.
3. Inspect the EGR valve passages and pipe for a
restriction or damages and repair as needed.
Is the repair complete?–Go to Step 5Go to Step 4
4Replace the EGR valve.
Is the repair complete?–Go to Step 5–
51. Disconnect the battery for more than 10 sec-
onds.
2. Drive the vehicle up to 97 km/h (60mph)
3. Release the throttle and allow the vehicle to
decelerate to 32 km/h (20mph).
Is the EGR Decel Filter value greater than specified
value?0Go to Step 3Go 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 – 471
DAEWOO V–121 BL4
The EGR Decel Filter value should always be at –3 or low-
er. If the EGR Decel Filter number becomes more positive
(towards 0 or more), then the EGR system is becoming re-
stricted. Look for possible damage to the EGR pipe or for
a restriction caused by carbon deposits in the EGR pas-
sages or on the EGR valve.
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. Commanding the EGR valve open determines
whether the EGR system can control the EGR
valve accurately and if the fault is present. The dif-
ference between the current and commanded posi-
tion is greater than 15%.
3. When the EGR valve electrical connector is discon-
nected, the scan tool should display the Actual
EGR Position as 0%. If it does not, the fault lies
either in the EGR signal circuit or the ECM.
4. There may be a slight delay for the voltage dis-
played on the DVM to change after the scan tool
commands the EGR valve to operate.
5. An open or poor connection condition may have
caused this DTC to set. Be sure to check the termi-
nals for being backed out, improperly formed or
damaged, and for poor tension.
7. The test light will have glowed brightly in the pre-
vious step if the EGR control circuit was shorted to
B+ and the Actual EGR Position on the scan toolwill display 100%. A test light that did not illuminate,
indicates that the circuit may be open or shorted to
ground.
9. If the EGR valve 5 volt reference is shorted to volt-
age, the digital voltmeter (DVM) will read battery
voltage and additional DTCs may be set and the
engine performance will be poor.
12. The replacement ECM must be reprogrammed.
Refer to the latest Techline procedure for ECM re-
programming.
13. Although the circuitry acted correctly when
checked, a problem may still lie within the terminals
which would not show up in probe type testing. Be
sure to check the terminals for being backed out,
improperly formed or damaged, and for poor ten-
sion.
17. All circuits to the EGR valve are OK at this point.
The fault lies internally in the EGR valve and, there-
fore, must be replaced. Be sure all gasket material
is removed from the EGR mounting surface. Even
a small amount of material may cause a DTC
P0401 to set.
18. Check the terminals for being backed out, improp-
erly formed or damaged, and for poor tension.
19. Clearing DTCs is a very important step for this
diagnostic. The clearing function allows the EGR
valve to relearn a new pintle position as the old
pintle position was inaccurate due to the failure that
caused the DTC. The DTC must be cleared with
the ignition ON, engine OFF or when the engine is
idling. If the ECM sees a EGR command, the new
pintle will not be learned.
20. If no malfunctions have been found at this point and
no additional DTCs were set, refer to ”Diagnostic
Aids” in this section for additional checks and infor-
mation.
DTC P0402 – Exhaust Gas Recirculation Excessive Flow
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.
3. Command the Exhaust Gas Recirculation
(EGR) valve to the specific values.
Does the Actual EGR Position follow the Desired
EGR Position?25%, 50%,
75%, 100%Go to Step 19Go to Step 3
31. Turn the ignition OFF.
2. Disconnect the EGR valve.
3. Turn the ignition ON.
4. With a test light connected to B+, probe the
EGR valve wiring harness connector terminal
2.
Does the test light illuminate?–Go to Step 4Go to Step 5

1F – 472IENGINE CONTROLS
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
41. Using a voltmeter, measure the voltage at the
EGR valve wiring harness connector terminal
1.
2. Command the EGR valve open with the scan
tool.
After command is raised, is the voltage displayed on
the voltmeter vary between specified value?0 to
5 VGo to Step 6Go to Step 7
5Repair the open or poor connection in the EGR
ground circuit as needed.
Is the repair complete?–Go to Step 19
6With a test light connected to ground, probe the EGR
valve wiring harness connector terminal 3.
Does the test light illuminate?–Go to Step 8Go to Step 9
7With a test light connected to ground, probe the EGR
valve wiring harness connector terminal 1, without
commanding the EGR valve with scan tool.
Dose the test light illuminate?–Go to Step 10Go to Step 11
8Check the signal circuit for a short to voltage and re-
pair as needed.
Is the repair complete?–Go to Step 19Go to Step 12
9With a voltmeter connected to the ground, probe the
5 volt reference circuit at terminal 4 of the EGR valve
wiring harness connector.
Is the voltage near the specified value?5 vGo to Step 13Go to Step 14
10Check the control circuit for a short to voltage and re-
pair as needed.
Is a repair necessary.–Go to Step 19Go to Step 12
11With a test light connected to B+ and again probe the
control circuit at terminal 1.
Dose the test light illuminate?–Go to Step 15Go to Step 16
121. Turn the ignition OFF.
2. Replace the Engine Control Module (ECM).
Is the repair complete?–Go to Step 19–
13Check the EGR ground circuit for poor connection or
proper terminal tension at the ECM and repair as
needed.
Is a repair necessary?–Go to Step 19Go to Step 17
14Check the 5 volt reference circuit for a short to volt-
age and repair as needed.
Is the repair necessary?–Go to Step 19Go to Step 12
15Check the control circuit 1 for short to ground and re-
pair as needed.
Is the repair necessary?–Go to Step 19Go to Step 12
16Check the control circuit at terminal 1 for an open or
poor connection at EGR valve connector and repair
as needed.
Is a repair necessary?–Go to Step 19Go to Step 18
171. Turn the ignition OFF.
2. Replace the EGR valve.
Is the repair complete?–Go to Step 19–

ENGINE CONTROLS 1F – 473
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
18Check the ECM connector for a poor connection and
repair as needed.
Is the repair complete?–Go to Step 19–
191. 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 20Go to Step 2
20Check if any additional DTCs are set.
Are any DTCs displayed that have not been diag-
nosed?–Go to
Applicable DTC
tableSystem OK