Daewoo Nubira. Service manual - part 115

 

  Index      Daewoo     Daewoo Nubira - service and repair manual

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  113  114  115  116   ..

 

 

Daewoo Nubira. Service manual - part 115

 

 

1F – 42

I

ENGINE CONTROLS

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

58

Repair the short or opening the circuit between the
fuel cutoff switch and the fuel pump.
Is the repair complete?

Go toStep 2

59

Replace the fuel cutoff switch.
Is the repair complete?

Go toStep 2

60

Check the wire between the fuel pump relay connec-
tor terminal 85 to the PCM/ECM connector terminal
E13 for an open.
Is the problem found?

Go toStep 61

Go toStep 33

61

Repair the wire between the fuel pump relay connec-
tor terminal 85 to the PCM/ECM connector terminal
E13.
Is the repair complete?

Go toStep 2

62

Repair the wire between the fuel pump relay connec-
tor terminal 30 and the battery.
Is the repair complete?

Go toStep 2

63

1.  Turn the ignition OFF.
2.  Disconnect the fuel injector harness connectors

from all of the fuel injectors.

3.  Turn the ignition ON.
4.  Connect a test light between the fuel injector

harness connector 1 and ground.

5.  Repeat Step 4 for each of the remaining fuel

injectors.

Is the test light on at all of the fuel injectors?

Go toStep 64

Go toStep 67

64

1.  Turn the ignition OFF.
2.  Connect a test light between the fuel injector

harness connector terminal 2 and battery posi-
tive.

3.  Crank the engine.
4.  Repeat Steps 3 and 4 for each of the remain-

ing fuel injectors.

Does the test light flash for all of the fuel injectors?

Go toStep 65

Go toStep 68

65

Measure the resistance of each fuel injector.
Is the resistance within the value specified (the re-
sistance will increase slightly at higher tempera-
tures)?

11.6–12.4 

W

System OK

Go toStep 66

66

Replace any of the fuel injectors with a resistance
out of specification.
Is the repair complete?

Go toStep 2

67

Repair the open wire(s) between the fuel injector
harness connector(s) terminal 1 and the battery.
Is the repair complete?

Go toStep 2

68

1.  Check for an open between the fuel injector

harness connector terminal 2 and the PCM/
ECM connector terminal C4 for the fuel injec-
tors one and four.

2.  Check for an open between the fuel injector

harness connector terminal 2 and the PCM/
ECM connector terminal C6 for the fuel injec-
tors two and three.

Is the problem found?

Go toStep 69

Go toStep 71

ENGINE CONTROLS  1F – 43

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

69

Repair the open fuel injector harness wire(s).
Is the repair complete?

Go toStep 2

70

Replace the fuse or repair the wiring as needed.
Is the repair complete?

Go toStep 2

71

1.  Inspect the engine fuse block fuse EF34.
2.  Check for an open in the fuel injector connector

terminals 1 and the ignition 1 relay connector
terminal 87.

Is the problem found?

Go toStep 68

Go to”Ignition

System Check”

1F – 44

I

ENGINE CONTROLS

DAEWOO V–121 BL4

NO MALFUNCTION INDICATOR LAMP

Circuit Description
When the ignition is turned ON, the Malfunction Indicator
Lamp (MIL) will momentarily flash on and off, then it will re-
main on until the engine is running if no Diagnostic Trouble
Codes (DTC) are stored. Battery voltage is supplied
through the ignition switch directly to the MIL telltale. The
powertrain control module (PCM)/engine control module
(ECM) controls the MIL by providing a ground path
through the MIL control circuit to turn on the MIL.

Diagnostic Aids
An open ignition #5 fuse will cause the entire cluster to be
inoperative, and may set DTC P1625.

Check the battery and ignition feed circuits for poor con-
nections if the MIL is intermittent.

Any circuitry, that is suspected as causing an intermittent
complaint, should be thoroughly checked for backed–out
terminals, improper mating, broken locks, improperly
formed or damaged terminals, poor terminals–to–wiring
connections or physical damage to the wiring harness.

Test Description
Number(s) below refer to the step number(s) on the diag-
nostic table.

1.

The On–Board Diagnostic (OBD II) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on then scan tool, if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is stored
in the scan tool for later reference.

3.

Connections that are suspected of being faulty
should be thoroughly checked as described in the
diagnostic aids.

4.

If the engine fails to start and the MIL is inopera-
tive, then the fault can be isolated to either the
PCM/ECM ignition feed, The battery feed, or a poor
ground at the engine block, or the PCM/ECM.

6.

Probing the MIL circuit with a test light to ground
stimulates the PCM/ECM’s control of the MIL. If the
MIL illuminates, then the malfunction can be iso-
lated to the control of the MIL or a poor connection
at the MIL terminal to the PCM/ECM. Connections
that are suspected of being faulty should be thor-
oughly checked as described in the diagnostic aids.

8.

It takes very little resistance for the battery and igni-
tion feed circuits to cause an intermittent condition
and should also be checked for a poor connection
as described in diagnostic aids.

ENGINE CONTROLS  1F – 45

DAEWOO V–121 BL4

11. Before replacing the PCM/ECM, check for backed-

out terminals, improper mating, broken locks, im-
properly formed or damaged terminals, poor termi-
nal–to–wiring harness. Replacement PCM/ECM’s
must be reprogrammed. Refer to the latest Techline
information for reprogramming procedures.

20. PCM/ECM grounds will only cause a problem if all

of the grounds are not making a good connection. If

a PCM/ECM ground problem is suspected, the
most probable place to check is where all the
grounds meet, at the engine block.

22. If not faults have been found at this point and no

DTCs were set, refer to the diagnostic aids for addi-
tional checks and information.

No Malfunction Indicator Lamp

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

Turn the ignition switch ON, with the engine OFF.
Is the Malfunction Indicator Lamp (MIL) on?

Go to Step 3

Go to Step 4

3

Check for a poor connection at the battery feed ter-
minal A4 or ignition feed terminal F16.
Is the problem found and repaired?

Go to Step 22

Go to Step 5

4

Attempt to start the engine.
Does the engine start?

Go to Step 6

Go to Step 5

5

Check for a faulty powertrain control module
(PCM)/engine control module (ECM) ground con-
nection at the engine block or PCM/ECM connector
ground terminals and repair as necessary.
Is the repair complete?

Go to Step 22

6

1.  Turn the ignition OFF.
2.  Disconnect the PCM/ECM connectors from the

PCM/ECM.

3.  Turn the ignition switch ON.

Is the MIL ON?

Go to Step 8

Go to Step 9

7

Inspect the ignition and battery feed fuses.
Are the fuses OK?

Go to Step 10

Go to Step 11

8

Check for a poor connection in the battery feed ter-
minal A4, ignition feed terminal F16 or the MIL con-
trol circuits and repair as necessary.
Is a repair necessary?

Go to Step 22

Go to Step 12

9

Probe the MIL control circuit with a test light con-
nected to ground.
Is the test light illuminated?

Go to Step 13

Go to Step 14

10

1.  Turn the ignition switch OFF.
2.  Disconnect the PCM/ECM connectors from the

PCM/ECM.

3.  Turn the ignition switch ON.
4.  Probe the battery feed terminal A4 with a test

light connected to ground.

Does the test light illuminate?

Go to Step 15

Go to Step 16

11

1.  Check for a short to ground in the circuit of the

fuse that was open and repair if necessary.

2.  Replace the open fuse.

Is the repair complete?

Go to Step 22

 

 

 

 

 

 

 

Content   ..  113  114  115  116   ..