Before Changing A Control Module

Before Changing A Control Module

It has been found from experience that the majority of control modules returned for warranty repairs are in perfect working order. In these cases, changing the control module has obviously not cured the fault. Go through the following points before changing the control module:
1 Check all grounding points and the power supply to the control module.
2 Using the diagnostic tool, check that all readings are plausible (several readings can affect a function).
3 Using the diagnostic 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.