main relay or (alt) fuse under dash. Test your fuses with a test light or multi meter. If your main relay is bad your fuel system will not operate and you will not get spark.
Proper ignition system evaluation begins by answering three basic diagnostic questions:
1. When you turn the ignition switch to ON (not START), does the Check Engine Light (CEL) come on and then go off after 2 seconds? If not, the problem is with the ACG (ALT) (S) fuse, in the under-dash fuse/relay box; ECM .
2. When the CEL goes out, (in your case it never comes on) do you hear and/or feel the Main Relay "click"? If not, repair or replace the Main Relay.
3. During the 2 second interval that the CEL is on, do you hear the fuel pump in the gas tank run? If not, check the fuel pump.
If the CEL does not go out, most Civics will not spark and the fuel pump will not run. That's why we begin our diagnosis here. Remember, the Main Relay actually contains two individual relays. One relay is energized whenever the ignition is on, which supplies battery voltage to the ECM, power to the fuel injectors, and power for the second relay. The second relay is energized for 2 seconds when the ignition is switched on, and when the engine is running which supplies power to the fuel pump.
Next, test all under-hood and under-dash fuses with a test light or multi-meter. Using a test light or multi-meter is faster, more accurate, and eliminates the possibility of replacing a fuse in the wrong
