Advanced Automotive Fault Diagnosis



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Advanced Automotive Fault Diagnosis
LÔØI NOÙI ÑAÀU, ledklok
Measured results
Present the results in a way that is easy to inter-
pret. A simple table of figures may be appropriate.
If the trend of the results or a comparison is import-
ant, a graph may be better. Pictures of results or
oscilloscope waveforms may be needed. If neces-
sary a very complex table of results from which
you draw out a few key figures, could be presented
as an appendix. You should also note the accuracy
of any figures presented (⫾0.5% for example).
Analysis of results
This is the part where you should comment on
the results obtained. For example, if say a fuel
consumption test was carried out on two vehicles,
a graph comparing one result to the other may be
appropriate. Comments should be added if nec-
essary, such as any anomaly that could have
affected the results (change of wind direction for
example).
Conclusions/comments/
observations
Note here any further tests that may be necessary.
Conclude that device X does perform better than
device Y – if it did! If appropriate, add observa-
tions such as how device Y performed better
under the set conditions, but under other circum-
stances the results could have been different.
Comment on the method used if necessary.
Forecast
If necessary comment on how the ‘item’ tested
will continue to perform based on the exist-
ing data.
Introduction
3


Appendices
Detailed pages of results that would ‘clog up’ the
main report or background material such as
leaflets relating to the test equipment.
1.4.3 Example report
An example report is presented here relating to a
simple alternator test where its actual output is to
be compared to the rated output. Minimal details
are included so as to illustrate the main points.
Introduction
A ‘Rotato’ 12 V alternator was tested under nor-
mal operating conditions to check its maximum
output. The manufacturer’s specifications stated
that the alternator, when hot, should produce 95 A
at 6000 rev/min.
Test criteria

Start at room temperature.

Run alternator at 3000 rev/min, 30 A output
for 10 minutes.

Run alternator at 6000 rev/min, maximum
output. Check reading every 30 seconds for 10
minutes.

Run alternator at 6000 rev/min, maximum out-
put for a further 20 minutes to ensure that out-
put reading is stable.

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