Check it just as you would a points system, EI and points system all suffer from the same issues. A logic prob would be nice to have even better a DSO. You can do a basic test with a test light the results are basically the same you are looking for the module to pull the circuit to ground are close. using 12V you would look for a high of 12V and a low of 1/2 Volt. Using a test light on the Negative terminal of the coil (12V negative ground) it should pulse the light.
Just like a points system its a switch the diagnostic process is basically the same. Using a logic probe (red high) (green low) you are looking for the module to switch the voltage high/low. A logic probe will not interfere with the circuit.
What are we out to prove the module is capable of switching the circuit, that's it if it does the module is good if not then we diagnose the health of the rest of circuit. There is no black magic to it.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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