Daewoo Nubira. Manual - part 198

INSTRUMENTATION/DRIVER INFORMATION  9E – 15

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

5

1.  Turn the ignition ON.
2.  Check the voltage at fuse F5.

Is the voltage equal to the specified value?

Go to Step 7

Go to Step 6

6

Repair the power supply for fuse F5.
Is the repair complete?

System OK

7

1.  Disconnect the instrument cluster connector.
2.  Turn the ignition ON.
3.  Check the voltage at instrument cluster con-

nector terminal A5.

Is the voltage equal to the specified value?

Go to Step 9

Go to Step 8

8

Repair the open circuit between fuse F5 and instru-
ment cluster connector terminal A5.
Is the repair complete?

System OK

9

With the instrument cluster disconnected, use an
ohmmeter to check the resistance between instru-
ment cluster connector terminal A14 and ground.
Is the resistance equal to the specified value?

[

 0 

W

Go to Step 11

Go to Step 10

10

Repair the open circuit between ground and instru-
ment cluster connector terminal A14.
Is the repair complete?

System OK

11

Check for a defect on the instrument cluster printed
circuit.
Is the printed circuit defective?

Go to Step 12

Go to Step 13

12

Replace the instrument cluster.
Is the repair complete?

System OK

13

With the instrument cluster disconnected, use an
ohmmeter to check for an open circuit between ter-
minal C10 of the powertrain control module
(PCM)/engine control module (ECM) and instru-
ment cluster connector terminal A7.
Does the ohmmeter indicate the specified value?

[

 0 

W

Go to Step 15

Go to Step 14

14

Repair the open circuit between the instrument clus-
ter connector terminal A7 and the PCM/ECM.
Is the repair complete?

System OK

15

Replace the tachometer.
Is the repair complete?

System OK

Go to Step 16

16

Replace the ECM.
Is the repair complete?

System OK

 

9E – 16

I

INSTRUMENTATION/DRIVER INFORMATION

DAEWOO V–121 BL4

FUEL GAUGE

Fuel Gauge Always Shows Full or Always Shows Empty

Step

Action

Value(s)

Yes

No

1

1.  Turn the ignition ON.
2.  Observe the fuel gauge.

Does the fuel gauge always indicate a full fuel tank
even though it has been established that the tank is
not full?

–

Go to Step 2

Go to Step 7

2

1.  Turn the ignition OFF.
2.  Disconnect the fuel level sensor.
3.  Turn the ignition ON.

Does the fuel gauge change to empty?

Go to Step 3

Go to Step 4

3

Replace the fuel level sensor.
Is the repair complete?

System OK

4

1.  Turn the ignition OFF.
2.  Disconnect the instrument cluster connector B.
3.  Turn the ignition ON.

Does the fuel gauge now indicate an empty fuel
tank?

Go to Step 5

Go to Step 6

5

Repair the short to ground in the PPL wire between
the instrument cluster connector and the fuel tank
sending unit.
Is the repair complete?

System OK

6

Replace the fuel gauge.
Is the repair complete?

System OK

7

1.  If the fuel tank shows empty even though it has

been established that the tank is not empty,
disconnect the fuel tank sending unit electrical
connector.

2.  Turn the ignition ON.
3.  Check the voltage at the fuel tank sending unit

connector terminal 1.

Does the voltmeter indicate the specified value?

11 – 14 v

Go to Step 8

Go to Step 11

8

1.  Disconnect the fuel level sensor electrical con-

nector.

2.  Use an ohmmeter to check the continuity of the

fuel level sensor.

Is there continuity between the fuel level sensor ter-
minals?

–

Go to Step 10

Go to Step 9

9

Replace the fuel level sensor.
Is the repair complete?

–

System OK

–

10

Repair the open circuit between terminal 6 of the fuel
level sensor and terminal D8 of the powertrain con-
trol module (PCM)/engine control module (ECM)
connector.
Is the repair complete?

System OK

11

With the ignition ON, use a voltmeter to back probe
terminal B5 of the PCM/ECM connector.
Is the voltage equal to the specified value?

11–14 v

Go to Step 12

Go to Step 13

INSTRUMENTATION/DRIVER INFORMATION  9E – 17

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

12

Repair the open circuit between terminal B5 of the
PCM/ECM and fuel level sensor connector 1.
Is the repair complete?

–

System OK

–

13

With the ignition ON, use a voltmeter to back probe
terminal C3 of the PCM/ECM connector.
Is the voltage equal to the specified value?

11–14 v

Go to Step 15

Go to Step 14

14

Repair the open circuit between terminal C3 of the
CM/ECM connector and terminal B5 of the instru-
ment cluster.
Is the repair complete?

–

System OK

–

15

Replace the PCM/ECM.
Is the repair complete?

–

System OK

–

TEMPERATURE GAUGE

Diagnostic Aids

For full scale readings, the gauge may be indicating the
correct coolant temperature. Problems not covered by this
diagnostic table include the following:

S

 

Low coolant level.

S

 

Improper coolant mixture.

S

 Coolant 

leaks.

S

 

Faulty coolant pump.

S

 Faulty 

thermostat.

S

 Gasket 

failure.

S

 

Lack of lubrication.

S

 

Lack of cooling fan operation.

This table covers problems with the gauge circuit, the

gauge, and the sending unit, but not problems which
cause actual overheating or underheating.

Test Description

The numbers below refer to steps on the diagnostic table.

2.

The engine coolant temperature (ECT) sensor for
the powertrain control module (PCM)/engine control
module (ECM) and the coolant temperature sensor
(CTS) are close together on the engine block. Refer
to the schematic to determine the correct wire color
to verify testing of the correct component.

3.

The ECT for the PCM/ECM and the CTS unit are
close together on the engine block. Refer to the
schematic to determine the correct wire color to
verify testing of the correct component.

Temperature Gauge Always Indicates Full Scale Hot Or Full Scale

Cold, Other Gauges Are OK

Step

Action

Value(s)

Yes

No

1

1.  Allow the engine to cool to room temperature.
2.  Turn the ignition ON.

Does the temperature gauge always read at the high
end of the scale?

Go to Step 2

Go to Step 7

2

Disconnect the coolant temperature sensor (CTS)
electrical connector.
Does the temperature gauge indicator point to the
low end of the scale?

Go to Step 3

Go to Step 4

3

Replace the CTS.
Is the repair complete?

System OK

4

1.  Turn the ignition OFF.
2.  Disconnect the instrument cluster connector A.
3.  Turn the ignition ON.

Does the temperature indicator now point to the low
end of the scale?

Go to Step 5

Go to Step 6

5

Repair the short to ground in the DK GRN wire be-
tween instrument cluster connector A and the CTS.
Is the repair complete?

–

System OK

–

9E – 18

I

INSTRUMENTATION/DRIVER INFORMATION

DAEWOO V–121 BL4

Step

No

Yes

Value(s)

Action

6

Replace the temperature gauge.
Is the repair complete?

System OK

7

1.  If the temperature gauge always reads at the

low end of the scale, disconnect the coolant
temperature sending unit.

2.  Turn the ignition ON.
3.  Check the voltage at the coolant temperature

sending unit connector.

Is the voltage equal to the specified value?

11 – 14 v

Go to Step 10

Go to Step 8

8

Use an ohmmeter to check for an open circuit be-
tween the CTS and the temperature gauge.
Is there an open circuit?

Go to Step 9

Go to Step 10

9

Repair the open circuit between the temperature
sending unit and temperature gauge.
Is the repair complete?

System OK

10

1.  Disconnect the CTS.
2.  Connect a jumper wire between the coolant

temperature sending unit connector and
ground.

3.  Turn the ignition ON.

Does the temperature gauge move to the high end
of the scale?

–

Go to Step 3

Go to Step 6

INSTRUMENT CLUSTER INDICATOR LAMPS

Diagnostic Aids
This table covers lamps powered by fuses F5 and F10:
door ajar, rear deck lid ajar, service engine soon, oil pres-
sure, battery, power, ABS, AIR BAG, low fuel warning. The
ground for each circuit is provided by the component being
monitored by the indicator lamp.

Instrument Cluster Indicator Lamps Do Not Operate

Step

Action

Value(s)

Yes

No

1

Check fuses F5 and F10.
Is either fuse blown?

Go to Step 2

Go to Step 3

2

1.  Check for a short circuit and repair it if neces-

sary.

2.  Replace the blown fuse.

Is the repair complete?

System OK

3

1.  Turn the ignition ON.
2.  Check the voltage at fuses F5 and F10.

Is the voltage equal to the specified value?

11 – 14 v

Go to Step 5

Go to Step 4

4

Repair the open power supply circuit for F5 and/or
F10.
Is the repair complete?

System OK

5

Check the cluster indicators.
Is the problem associated with all of the cluster indi-
cators?

Go to Step 8

Go to Step 6