Advanced Automotive Fault Diagnosis

Calibration
Checking the accuracy of a measuring 
instrument
Serial port
A connection to an ECU, a diagnostic tester 
or computer for example. Serial means the 
information is passed in a ‘digital’ string like 
pushing black and white balls through a pipe 
in a certain order
Code reader 
This device reads the ‘black and white balls’ 
or scanner
mentioned above, or the on-off electrical 
signals, and converts them to language we 
can understand
Combined 
Usually now PC based, these systems can be 
diagnostic and 
used to carry out tests on vehicle systems 
information 
and they also contain an electronic 
system
workshop manual. Test sequences guided by 
the computer can also be carried out
Oscilloscope
The main part of ‘scope’ is the display, which 
is like a TV or computer screen. A scope is 
a voltmeter but instead of readings in 
numbers it shows the voltage levels by a 
trace or mark on the screen. The marks on 
the screen can move and change very fast 
allowing us to see the way voltages change
3.1.2 Basic hand tools
You cannot learn to use tools from a book; it is
clearly a very practical skill. However, you can
follow the recommendations made here and of
course by the manufacturers. Even the range of
basic hand tools is now quite daunting and very
expensive.
It is worth repeating the general advice and
instructions for the use of hand tools.
●
Only use a tool for its intended purpose.
●
Always use the correct size tool for the job
you are doing.
●
Pull a wrench rather than pushing whenever
possible.
●
Do not use a file or similar, without a handle.
●
Keep all tools clean and replace them in a suit-
able box or cabinet.
●
Do not use a screwdriver as a pry bar.
●
Always follow manufacturers’ recommenda-
tions (you cannot remember everything).
●
Look after your tools and they will look after
you!

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