Before control modulereplacement
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Before control module
replacement
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When all tests have been carried out according to the
relevant diagnostics procedure or by manual fault diagnosis
without any faults having been found, it is natural to assume
that the control module is at fault.
In view of the fact that the control module is an exceptionally high-quality component and also
extremely expensive, it is important to verify the diagnosis as far as possible.
Therefore, go through all the points very carefully before definitely pointing to the control
module as the cause of the fault.
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1.
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Check once again that every
single point in the fault
diagnosis programme of the relevant diagnostic trouble code
has been carried out.
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2.
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Study the wiring diagram of the circuit in question and make
sure you understand how it works. Relevant parts of the
technical description and the electrical descriptions of
operation in Service Manual 3:2 "Electrical system" may be of
assistance in this respect.
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3.
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Check all grounding points. If you have already done so, do
it once again. Check that power ground and signal ground are
mechanically and electrically separate.
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4.
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Check the voltage supplied to the control module.
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5.
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Go through all the points in "Points to remember" once again.
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6.
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If the original fault still persists in spite of this, then
the MOTRONIC control module will have to be replaced.
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