Long time lurker here. I have a b18b swapped into a 92 civic eg hatch. I'm using the original harness from the 92 civic d series on my b18b, and I'm using the p75 b18b ecu. The engine will only turn over 2 or 3 times before I loose electrical power to my dash and everything else. It basically seems like a dead battery. If I just turn off the car and remove the keys and try again I will not have any electrical power. If I then jump the ECU pin for checking CEL codes, I will get electrical power back to my dash and I can crank the engine again (only turns over a couple times before dying). It seems like jumping the ECU CEL pin somehow helps the system reset, or recycle or something, because I have to jump and unjump the ECU CEL pin in order to get electrical power to everything. The car runs and if I jump and unjump eventually I can get it to start. Anybody ever experienced this? Also I will get a check engine light while driving that doesn't stay logged in the ECU after I turn off the car to Jump the ECU CEL pin and read it, it always clears.

 

Check the ground wire at G101 located on the thermostat housing.

 

Thank you so much tech8 will do. Any other help or suggestions?

 

The ground looks good. Any other help? Why is the ecu jumper pin associated with having to crank the car?