Before changing a control module
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Before changing a control module
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It has been found that the majority of control modules returned for repair under warranty are in perfect working order. In these cases, fitting a replacement control module has obviously not cured the fault. Therefore, go through the following points carefully before definitely deciding to change the control module:
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1.
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Check all grounding points and the power supply for the control module.
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2.
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Use the diagnostics instrument to check that all test readings obtained are plausible (several test readings may have a bearing on a particular function).
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3.
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Use the diagnostics instrument to check that all activated functions are in working order (a fault in one output circuit could affect another output circuit).
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4.
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If the fault persists the control module will have to be changed.
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5.
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When handling control modules it is important to ground yourself first by touching the bonnet, for instance.
Avoid touching the control module's pins.
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