Opel Frontera UBS. Manual - part 1693

 

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Opel Frontera UBS. Manual - part 1693

 

 

8D–450

WIRING SYSTEM

1-4.  Speedometer Needle Fluctuations (May Be Wide Fluctuation)

DOES THE VEHICLE SPEED SENSOR OUTPUT
NORMALLY?

YES

THE OSCILLOSCOPE WAVEFORM IS DEFORMED

REPLACE THE METER ASSEMBLY

REPLACE THE VEHICLE SPEED SENSOR OR REPAIR
A POOR CONNECTION AT THE CONNECTORS IN THE
CIRCUIT OR A FAILURE IN THE CABLE HARNESS

NO

1-5.  Speedometer Needle Jumps Erratically

DOES THE VEHICLE SPEED SENSOR OUTPUT
NORMALLY?

YES

AN ABNORMAL PERIODIC WAVEFORM IS OUTPUT BY
OSCILLOSCOPE

REPLACE THE METER ASSEMBLY

REPLACE THE VEHICLE SPEED SENSOR, OR REPAIR
A POOR CONNECTION AT THE CONNECTORS IN THE
CIRCUIT OR A FAILURE IN THE CABLE HARNESS

NO

WIRING SYSTEM

8D–451

I-9

I-10

Inspection of a waveform by oscilloscope

1. Connect a resistance of 1.3 to 5k ohm (1.4W or more) between the harness side connectors 15   I-9

and 5   I-10   (w/o TOD) or 26   I-9   and 5   I-10

2.
3.
4.

Install a speedometer tester.
Turn on the starter SW.
Check the waveform at the time when the car speed is at 60 km/h.

Normal waveform

OV

23.6m sec.

2V or less

Approximate battery voltage

1

2

3

4

5

6

7

8

9 10 11 12 13 14

15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30

1 2 3 4

13 14

5

6 7 8 9 10

15 16

17 18 19 20

11 12

21 22

2.  Tachometer

2-1.  Tachometer Does Not Function

IS THE PULSE INPUT NORMAL?

YES

REPLACE THE PCM, ECM OR REPAIR A POOR
CONNECTION AT THE CONNECTORS IN THE CIRCUIT
OR A FAILURE IN THE CABLE HARNESS

NO

REPLACE THE METER ASSEMBLY

8D–452

WIRING SYSTEM

2-2.  Tachometer Needle Fluctuates (May Be Wide Fluctuation)

IS THE PULSE INPUT NORMAL?

YES

THE WAVEFORM BY OSCILLOSCOPE IS DEFORMED
(ABNORMAL INPUT)

NO

REPLACE THE METER ASSEMBLY

REPLACE THE PCM, ECM OR REPAIR A POOR
CONNECTION AT THE CONNECTORS IN THE CIRCUIT
OR A FAILURE IN THE CABLE HARNESS

2-3.  Tachometer Needle Jumps Erratically

IS THE PULSE INPUT NORMAL?

YES

AN ABNORMAL PERIODIC WAVEFORM IS OUTPUT
BY OSCILLOSCOPE

NO

REPLACE THE METER ASSEMBLY

REPLACE THE PCM, ECM OR REPAIR A POOR
CONNECTION AT THE CONNECTORS IN THE CIRCUIT
OR A FAILURE IN THE HARNESS

WIRING SYSTEM

8D–453

I-9

Inspection of a waveform by oscilloscope

1. Check the waveform of the meter assembly connector 9    I-9    (Tachometer pulse).

Normal waveform

OV

6.7m sec.

MIN. 0.4V

MAX. 4.3V

Engine revolution :  3000 rpm

1

2

3

4

5

6

7

8

9 10 11 12 13 14

15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30

 

 

 

 

 

 

 

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