Advanced Automotive Fault Diagnosis

Conclusion, web resources and developments
265
methods (Figure 11.7). It even includes some
useful flow charts and lists of codes.
11.5 Summary
Modern motor vehicles are highly sophisticated
machines that incorporate the latest developments
in electrical, electronics, software and mechanical
engineering. They are a marvel of modern engin-
eering practice and truly show how all these tech-
nologies can be integrated and harmonised for
maximum benefit to the end user.
It is clear that this level of technology pro-
duces the safest, quietest and most efficient road
vehicles we have ever known. The disadvantage
of this level of sophistication really becomes
apparent when something goes wrong! Clearly,
the more sophisticated the device, the more diffi-
cult it will be to repair, or understand in order to
repair. It is often the case that it may be perceived
that no faults can be found or fixed without spe-
cialised manufacturer equipment which is only
available at dealers.
This is not the case! The fundamental prin-
ciples of diagnostics in conjunction with an
applied, logical thought process are the most pow-
erful tools that you have. Any specialist equip-
ment will still only be as good as the person using
it. Modern vehicle systems are certainly sophisti-
cated but the fundamental principles apply. An
ECU is only monitoring voltages from its sensors.
These are the inputs; the outputs are voltages and
currents which drive actuators (injector, idle speed
control valves etc.), they are all the same and
applied logic can fix most problems.
Engines and chassis are also complicated sub-
systems of the vehicle but in all cases the laws of
physics apply, and all engines do the same thing
in more or less the same way. They are just

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