Opel Frontera UBS. Service 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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