Before Changing A Control Module

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 diagnostics tool, check that all readings are plausible (several readings can affect a function).
3 Using the diagnostics tool, check that all activations function. (A fault in one output circuit can affect another output circuit.)
4 If the fault persists, the control module must be replaced.
5 When handling the control module, it is important to ground yourself by touching the engine, for example. Avoid touching the pins of the control module.