existanzcivicb20

Hey guys so just reinstalled my engine into my civic and when I tried to start the car for the first time I saw the check engine light come on for 2 seconds and then turn off (normal) while the fuel pump primed. Cranked the engine over started then stalled. Now I don't see the check engine light come on and the fuel pump does not prime... What can cause this issue?

Ohmega

iTrader: (1)

Fuses?

existanzcivicb20

Yeah I checked all the fuses one by one. And I have a ground to the valve cover, thermostat housing, trans, and body

JDMswagSerf

Fried the ecu possibly?

Check the fuses with teslights and fuel pump fuse with the key in the on position.
You checked all the fuses in the engine bay as well correct.

existanzcivicb20

Yes all the fuses in the engine bay as well. Is there any way to test the ECU? I don't have another one to throw in it at the moment. What could cause the ECU to take a dump like that? I didn't rewire anything

Risto Zupsmann

https://honda-tech.com/honda-civic-d...meter-2560243/ maybe basic ecu tests help?

existanzcivicb20

Thank you for that link. For the first test I got
B1-A26= -.41v it's suppose to be 12.3v
A25-A26= -.41v it's suppose to be 12.3v
A23-body= 11.56v
So then I did B1-body and I got 11.56v
and A25-body and got 11.56v
Also when I do A26-body I get 11.56v with red lead in A26
But I am still unsure of where to look next

JDMswagSerf

Once this happened to my Acura. I swore up and down I checked all the fuses so I bought a new ecu. Still didn't turn on. Then I checked the fuses again and sure enough one was blown. Haha.

existanzcivicb20

Just swapped out for a known good ECU and same problem no change

JDMswagSerf

Short some where in the wires or blown fuse.

Ohmega

iTrader: (1)

So we already know its a 95 eg.
What we don't know is what engine.
Why did you remove the engine in the first place? And did you stick the stock engine back in?

JDMswagSerf

Possibly bad main relay.

existanzcivicb20

Same engine same wire harness never touched the ecu. I did swap out the main relay for a known good one. Only reason engine came out was to clean and rebuild it. Engine and car is completely stock

existanzcivicb20

thanks guys for the suggestions but I tracked it down to a ground wire that got cut from the ECU to the thermostat housing