How to
Wire an
E C M
Relay
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Modern engine control modules or E C M circuits have the job of providing the main fuel injection computer with two types of power feed, switched power and permanent power feed.
Permanent power is a simple connection to the 12.6 volts battery voltage source right through a protection fuse.
The other side of the circuit is the switched power supply. This power supply is done through a relay, but keep in mind that as simple as this wiring is, it also controls the entire E C M operation. From the switched power supply, the E C M also senses this 12 volt input and powers the fuel pump relay. If there's no crank sensor input meaning that the engine hasn't been started and is not cranking, then the E C M cuts the activation to the fuel pump relay in order to prevent it from functioning while the engine is
Off.
The circuit presented here is a fairly non complicated circuit, but it serves as the basis of understanding how E C M circuits are wired. It also serves as a guide in the event that, as it is often done today, the owner of an older, vintage or collectible vehicle wants to switch to a fuel injection system. In many cases older carburetors are either non repairable due to parts or they are too expensive to keep them in operation. So, it pays to take them out of commission until the owner wants to sell his vehicle.
Aftermarket cost effective fuel injection systems are now very much available and simple to set and program.
Here is how this circuit operates
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- published: 03 May 2012
- views: 21622