Before Changing A Control Module

Experience has shown that the majority of control modules returned for repair under warranty are in perfect working order. In such cases, changing the control module has obviously not cured the trouble. Therefore, check the following points carefully before changing the control module:
1 Check all grounding points and the supply of current to the control module.
2 Using the diagnostic tool, check that all readings are plausible.
3 Using the diagnostic tool, check that all activation commands produce the desired result.
4 If the fault persists, the control module must be changed.
5 When handling a control module, it is important to ground yourself first by touching the engine, for example. Avoid touching the pins of the control module.