Ok boys and girls heres the deal...

Car was running fine. Turned it off lastnight. Now wont start.

Main relay does not click.

Tried 3 differ main relays that are known to be good.

No Spark/No fuel.

Put power directly from battery to the main relay power nwire. Car starts and runs fine. But if I turn the car off and crank it again it will not start.

If I take the power wire off and put it back on it turns on right away.

Im clueless. Swapped engine harness, ecu, battery, checked all the fuses, swapped dizzy..

Any ideas? It has headlight fluid, vtec fluid, muffler bearing all the bullshit so don't waste your time asking.

 

The PGM-FI Main Relay has 3 power leads a 12V+ constant, [hot at all times] a 12V+ switched, [hot in run and start] and another 12V+ switched, [hot in start only].

A MM&Y of car will help. 94

 

Shittt. I was making this thread in a rush lol...

95 Honda Civic CX
JDM Gsr Swap
Obd1 Motor/Harness
P72 Ecu

Car was running perfect lastnight.

I have power out of the ignition switch. So thats good. I was really hoping that was the problem. The car runs good when i give the relay power. Next step I guess is to pull the dash and see whats going on behind it.

 

I put power to the (IGN).

#5 On this diagram...

 

#5 is, [as indicated] ign. power, it controls the injector relay and is power for the fuel pump relay, the input and output power for the injector relay is a 12V+ constant, hot at all times, that output powers the injectors, ECU/ECM, [12V+ signal] and a few engine valve/solenoids and to the fuel pump relays coil, the 3rd power is a 12V+ start, [hot in start only], it is a "backup" power for the fuel pump relays coil during cranking, output of the fuel pump relay goes to the fuel pump only.

You will need to find out why there is no ign. power, [no power to #5] you also need to check for the other two powers, [#2 (start) and #7, (batt.)] along with a good ground for injector relay, [#3].

Why not disconnecting the direct batt. power to #5 before restarting is another issue, How #5 gets power should not make a diff. other then it may have something to do with the power, [signal] going the the ECU/ECM, it may need to be switched off when engine is and it would not be if #5 is a 12V+ constant, [hot at all times].

Try this, connect the jumper to the ign. switch output instead of the batt. so the injector relay also turns off, [power cut to #5] when you turn off the engine and see if that makes a diff. 94

 

^Thats my next plan. To wire it to a switched power. I was just doing it to the battery yesterday to see if it would work. The grounds are good. Because if I put a ground to the main relay with no power. It still has the same no power issue. Im wondering if maybe the under dash fuse box went to ****. As for now all i've figured out is that when I put 12v to #5 it'll start fine. Im gonna pull the dash out and check the wiring behind it to make sure nothing is frayed up or anything along those lines. I'll prolly swap the under dash fuse box because I have a spare so it wont hurt to try it. It's just weird because it was running fine then all the sudden just happened and nothing on the car was touched when it happened.