Technical Tips > Post 84

C4 1987 Throttle Body Coolant Bypass

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Vettech:

Further, the ECM is a computer consisting of amongst other things GATES - "OR" Gates, "NOR" Gates "AND" Gates to name a few.
It is not alive and therefore cant tell if the engine is running or not, unless it can see certain conditions or inputs on defined terminals.
Therefore; if it sees a fat +12v on terminal B2 ("Fuel Pump ON Input")"AND" pulses from the Dizzy on maybe terminal B5, then it outputs the signal that engine is running, and enables all systems accordingly.
Since Fuel Pump on "AND" Dizzy pulses = Engine Running.
This would roughly equate to one line of program code within the central processor.

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