Before changing a control module
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Before changing a control module
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When all tests and checks have been carried out in accordance with the
diagnostics procedure for the relevant diagnostic trouble code, or by manual fault diagnosis,
without any faults having been found, it is natural to assume that the control module is at fault.
Therefore, go through all the following points very carefully before definitely pinpointing
the Motronic 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 diagnostic procedure for the diagnostic trouble code in question 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 may be of assistance in this respect.
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3.
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In connection with removing and fitting the control module, bear in mind its
sensitivity to electrostatic discharges. See
for more detailed
information.
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4.
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Check all grounding points and the control module's power supply. If you
have already done so, do it once again. Check that power ground (G7P) and sensor ground
(G7S) are physically and electrically separated from each other. See diagnostic trouble code
P1500.
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5.
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If the suggested fault diagnosis procedures do not produce results, try to trace
the trouble by consulting and analysing "Test readings, control module connections".
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6.
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Think of all possible and reasonable causes of the fault before changing the
control module. When changing a control module for testing purposes, always refit the original
control module.
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7.
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If the original fault still persists in spite of this, then the Motronic control module
will have to be changed.
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