DAF CF65, CF75, CF85 Series . Manual — part 490
5
CF65/75/85 Series ≥0E621376
Contents
DIAGNOSTICS
1
CONTENTS
Page
Date
1. FAULT FINDING
1-1
200520
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1.1
Short circuits
1-2
200520
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1.2
Open circuit
1-3
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1.3
Earthing problems
1-4
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2. BATTERIES
2-1
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2.1
Fault-finding table
2-1
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2.2
Service life
2-4
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3. ALTERNATOR
3-1
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3.1
Fault-finding table
3-1
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4. XENON LIGHTING
4-1
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4.1
Fault-finding table
4-1
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1
200520
5
DIAGNOSTICS
Contents
CF65/75/85 Series ≥0E621376
2
1
200520
5
CF65/75/85 Series ≥0E621376
Fault finding
DIAGNOSTICS
1-1
1. FAULT FINDING
The following test equipment and tools can be
used to trace faults.
1. The best instrument for this is a digital
multimeter. This instrument can be used to
measure voltages, currents and resistances
avoiding reading errors, and it can be used
to trace virtually any faults.
2. Many, but not all, faults are easily traced by
means of warning lamps. Failures caused
by poor earthing cannot normally be
detected by a warning lamp or buzzer.
The most frequently occurring faults are:
a.
short circuit
b.
open circuits
c.
earthing problems (poor earthing due to
corrosion).
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5
DIAGNOSTICS
Fault finding
CF65/75/85 Series ≥0E621376
1-2
1.1 SHORT CIRCUITS
A short circuit is caused by a positive wire
shorting to earth somewhere. In most cases this
will cause a fuse to blow.
To remedy this failure, use a test lamp of
approximately 70W. First check the diagram to
see which consumers are connected to the fuse
in question, and then switch them all off.
Remove the fuse and connect the test lamp in
its place. Now switch each of the consumers on
and off one by one. If the lamp comes on very
brightly when a consumer is switched on, the
fault is almost certainly in the wiring of that
consumer. Now check the diagram to see via
which connectors the consumer is connected.
Now disconnect the first wiring connection (as
seen from the fuse).
If the lamp is still bright, the fault is between the
fuse and this wiring connection.
If, however, the lamp goes out, the fault is
somewhere further on in the wiring.
Now reconnect the connectors and disconnect
the next wiring connection. If the lamp is still
bright, the failure is between these two wiring
connections.
However, if the lamp goes out again, the
fault-finding procedure must be continued.
The faulty wiring section can be found in this
way.
W 5 03 013
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