Advanced Automotive Fault Diagnosis

often come as part of a kit consisting of various
adapters and connections. The principle of the
gauges is that they contain a very small tube wound
in a spiral. As fuel under pressure is forced into a
spiral tube it unwinds causing the needle to move
over a graduated scale. Figure 3.13 shows a fuel
pressure gauge as part of a kit.
Measuring engine cylinder compression or leak-
age is a useful test. Figure 3.14 shows an engine
compression tester. This device is used more to
compare cylinder compressions than to measure
actual values.
3.4.4 Bosch KTS diagnostic
equipment
Author’s Note: This section will outline the use and fea-
tures of the Bosch KTS 650 diagnostic system. I have
chosen this particular tool as a case study because it
provides everything that a technician needs to diagnose
faults. The system is a combination of a scanner, mul-
timeter, oscilloscope and information system (when
used with Esitronic). At the time of writing (2006) the
price was about £5000/$8000. For more information:
www.bosch.com.
Modern vehicles are being fitted with more
and more electronics. That complicates diagnosis
and repair, especially as the individual systems are
often interlinked. The work of service and repair
workshops is being fundamentally changed. Auto-
motive engineers have to continually update their
knowledge of vehicle electronics. But this is no
longer sufficient on its own. The ever-growing
number of electrical and electronic vehicle com-
ponents is no longer manageable without modern
diagnostic technology – such as the latest range
of KTS control unit diagnostic testers from Bosch
(Figure 3.15). In addition, more and more of the
previously purely mechanical interventions on
vehicles now require the use of electronic control
units – such as the oil change, for example.
Tools and equipment

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