Opel Frontera UBS. Service manual — part 2812

8D–448

WIRING SYSTEM

Parts Location (LHD 4JG2)

Legend

(1) L-5
(2) I-10
(3) I-9
(4) F-5
(5) B-27
(6) C-15
(7) H-33
(8) R-4
(9) H-7, H-9, H-24, H-25, H-62

(10) B-26
(11) C-16
(12) H-46
(13) Fuse Box
(14) B-18

(15) C-68
(16) B-62
(17) H-4, H-5
(18) C-67
(19) E-36
(20) C-9
(21) E-19
(22) B-6, B-7 (Alarm and Relay Control Unit)
(23) B-1, B-2
(24) Relay and Fuse Box
(25) C-39
(26) H-12, H-14, H-16, H-21, H-48
(27) E-2
(28) E-20

D08RW897

1

2

3

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5

6

7

8

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18

19

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25

26

27

28

WIRING SYSTEM

8D–449

Diagnosis

1. Speedometer

1-1. Speedometer and Odometer Do Not Function

•

DOES THE CAR SPEED SENSOR OUTPUT IN
4 PULSES/1 ROTATION?

YES

•

ARE THE CIRCUITS BETWEEN THE VEHICLE SPEED
SENSOR AND THE METER, AND THE FUSE C-10
(10 A) AND THE GROUND NORMAL?

YES

REPLACE THE VEHICLE SPEED SENSOR

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT IN THE CIRCUIT

NO

REPLACE THE METER ASSEMBLY

1-2. Speedometer Does Not Function (Odometer is Normal)

REPLACE THE METER ASSEMBLY

1-3. Odometer Does Not Function (Speedometer is Normal)

REPLACE THE METER ASSEMBLY

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

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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