Daewoo Nubira. Manual - part 113

 

  Index      Daewoo     Daewoo Nubira - service repair manual

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  111  112  113  114   ..

 

 

Daewoo Nubira. Manual - part 113

 

 

1F – 34

I

ENGINE CONTROLS

DAEWOO V–121 BL4

Multiple PCM/ECM Information Sensor DTCs Set

Step

Action

Value(s)

Yes

No

1

Perform an On–Board Diagnostic (OBD II) System
Check.
Is the system check complete?

Go to Step 2

Go to ”On–

Board Diagnos-

tic System

Check”

2

1.  Ignition OFF, disconnect the powertrain control

module (PCM)/engine control module (ECM).

2.  Ignition ON, check the 5 volt reference circuit

for the following conditions:

S

  Poor connection at the PCM/ECM.

S

  Open between the PCM/ECM connector

affected sensors shorted to ground or volt-
age.

3.  If a problem is found, locate and repair the

open or short circuit as necessary.

Is a problem found?

Go to Step 21

Go to Step 3

3

1.  Check the sensor ground circuit for the follow-

ing conditions:

S

  Poor connection at the PCM/ECM or af-

fected sensors.

S

  Open between the PCM/ECM connector

and the affected sensors.

2.  If a problem is found, repair it as necessary.

Is a problem found?

Go to Step 21

Go to Step 4

4

Measure the voltage between the Exhaust Gas Re-
circulation (EGR) Pintle Position Sensor signal cir-
cuit at the PCM/ECM harness connector and
ground.
Does the voltage measure near the specified value?

0 v

Go to Step 5

Go to Step 9

5

Measure the voltage between the Manifold Absolute
Pressure (MAP) sensor signal circuit and the PCM/
ECM harness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 6

Go to Step 12

6

Measure the voltage between the Throttle Position
(TP) sensor signal circuit and the PCM/ECM har-
ness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 7

Go to Step 13

7

Measure the voltage between the Intake Air Temper-
ature (IAT) sensor signal circuit and the PCM/ECM
harness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 8

Go to Step 14

8

Measure the voltage between the Engine Coolant
Temperature (ECT) sensor signal circuit and the
PCM/ECM harness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 10

Go to Step 15

9

1.  Disconnect the EGR valve.
2.  Measure the voltage between the EGR Pintle

Position sensor signal circuit and the PCM/
ECM harness connector and ground.

Does the voltage measure near the specified value?

0 v

Go to Step 11

Go to Step 16

ENGINE CONTROLS  1F – 35

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

10

Measure the voltage between the Transmission
Fluid Temperature (TFT) sensor signal circuit and
the PCM/ECM harness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 18

Go to Step 17

11

Replace the EGR valve.
Is the repair complete?

Go to Step 21

12

Locate and repair short to voltage in the MAP sensor
signal circuit.
Is the repair complete?

Go to Step 21

13

Locate and repair short to voltage in the TP sensor
signal circuit.
Is the repair complete?

Go to Step 21

14

Locate and repair short to voltage in the IAT sensor
signal circuit.
Is the repair complete?

Go to Step 21

15

Locate and repair short to voltage in the ECT sensor
signal circuit.
Is the repair complete?

Go to Step 21

16

Locate and repair short to voltage in the EGR Pintle
Position sensor circuit.
Is the repair complete?

Go to Step 21

17

Locate and repair short to voltage in TFT sensor cir-
cuit.
Is the repair complete?

Go to Step 21

18

Measure the voltage between the Fuel Tank Pres-
sure sensor signal circuit and the PCM/ECM har-
ness connector and ground.
Does the voltage measure near the specified value?

0 v

Go to Step 20

Go to Step 19

19

Locate and repair short to voltage in the Fuel Tank
Pressure sensor signal circuit.
Is the repair complete?

Go to Step 21

20

Replace the PCM/ECM.
Is the repair complete?

Go to Step 21

21

1.  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 the DTCs as specified in the supporting
text.

Does the scan tool indicate that this diagnostic ran
and passed?

Go to Step 22

Go to Step 2

22

Check if any additional DTCs are
Are any DTCs displayed that have not been diag-
nosed?

Go to applica-

ble DTC table

System OK

1F – 36

I

ENGINE CONTROLS

DAEWOO V–121 BL4

ENGINE CONTROLS  1F – 37

DAEWOO V–121 BL4

ENGINE CRANKS BUT WILL NOT RUN

Test Description

The number(s) below refer to step(s) on the diagnostic
table.

3.

By performing a compression test, it can be deter-
mined if the engine has the mechanical ability to
run.

9.

It is important to check for the presence of spark
from all of the ignition wires. If spark is present from
one to three of the ignition coil terminals, the crank-
shaft position (CKP) sensor is OK.

19. In checking the powertrain control module

(PCM)/engine control module (ECM) outputs for the
electronic spark timing signal, it recommended to
use an oscilloscope to view the varying voltage sig-
nals. In measuring these outputs with a voltmeter,
intermittent errors may occur that cannot be seen
by a voltmeter.

35. This step checks for proper operation of the PCM/

ECM’s control of the fuel pump circuit.

59. This step checks for a ground signal being supplied

by the PCM/ECM to operate the fuel injectors. If
there is no ground present during the cranking of
the engine, and the fuel injector wiring is OK, the
PCM/ECM is at fault.

Engine Cranks But Will Not Run

CAUTION : Use only electrically insulated pliers when handling ignition wires with the engine running to prevent
an electrical shock.

CAUTION : Do not pinch or restrict nylon fuel lines to avoid damage that could cause a fuel leak, resulting in
possible fire or personal injury.

Important : If engine cranks but will not start, make sure fuel cut–off switch has not been tripped.

Step

Action

Value(s)

Yes

No

1

Perform an On–Board Diagnostic (OBD II) System
Check.
Is the system check complete?

Go to Step 2

Go to ”On–

Board Diagnos-

tic System

Check”

2

Crank the engine.
Does the engine start and continue to run?

System OK

Go to Step 3

3

Perform a cylinder compression test.
Is the cylinder compression for all of the cylinders at
or above the value specified?

689 kPa (100

psi)

Go toStep 7

Go toStep 4

4

Inspect the timing belt alignment.
Is the timing belt in alignment?

Go toStep 6

Go toStep 5

5

Align or replace the timing belt as needed.
Is the repair complete?

Go toStep 2

6

Repair the internal engine damage as needed.
Is the repair complete?

Go toStep 2

7

Inspect the fuel pump fuse.
Is the problem found?

Go toStep 8

Go toStep 9

8

Replace the fuse.
Is the repair complete?

Go toStep 2

9

Check for the presence of spark from all of the igni-
tion wires while cranking the engine.
Is spark present from all of the ignition wires?

Go toStep 34

Go toStep 10

10

1.  Measure the resistance of the ignition wires.
2.  Replace any of the ignition wire(s) with a resist-

ance above the value specified.

3.  Check for the presence of spark from all of the

ignition wires.

Is spark present from all of the ignition wires?

30,000 

W

Go toStep 2

Go toStep 11

 

 

 

 

 

 

 

Content   ..  111  112  113  114   ..