Procedure prior to replacement of a controlmodule
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Procedure prior to replacement of a control
module
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If it has not been possible to find any fault after everything has been checked in
accordance with the diagnostic procedure for the relevant diagnostic trouble code, and
separate checking of component operation has also been carried out, it is natural to assume
that the control module is defective.
In view of the fact that the control module is manufactured to extremely exacting
standards of quality, and also because it is a rather expensive component, every effort should
be made to ensure that the diagnosis is as accurate as possible.
Therefore, run through the following points before definitely settling on the TCS control
module as the cause of the fault.
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1.
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Check once again that all points
in the relevant diagnostic procedure have been carried out correctly.
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2.
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Study the schematic diagram of the relevant circuit until you understand how it
works. If necessary, consult appropriate parts of the technical description and suitable
sections of Service Manual 3:2 "Electrical system, system diagrams, operation and fault-
tracing".
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3.
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Check the control module's ground connections once again and
also check that the relevant grounding points are good and correct.
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4.
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Check the control module's voltage supply.
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5.
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Also go through the points in "Points to note when diagnosing faults" and make
sure that you have not overlooked anything.
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6.
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If the original fault still persists, the TCS control module will have to be changed.
Do not forget to program the control module for the car variant in question.
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All control modules are more or less sensitive to static electricity and, if handled
carelessly or incorrectly, may be damaged so seriously that they no longer work properly. It is
therefore important to ensure that the following rules are observed at all times when a control
moodule is removed or replaced for any reason.
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Note
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Avoid unplugging or removing a control module unless
absolutely necessary.
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Never touch the connector pins and never place the control module in such a
way that the connector pins may come into contact with foreign objects.
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Before unpacking a new control module, ground the packaging to the car body.
Open the packaging as shortly as possible before installing the control module.
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Avoid wearing clothes made of synthetic (man-made) fibres.
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When handling or working on control modules it is important to ground yourself
from time to time. This is particularly important when you have been sitting in the car, when
changing your position, or when moving round the car. It is even more important in a climate
with extremely dry air (e.g. during the winter in cold markets).
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Furthermore, always handle control modules which are suspected of being
defective in the same manner. This will greatly improve the chances of determining the cause
of the fault.
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