Hi I have a 1990 Honda civic dx and it will not start I have no spark I replaced the ignition coil and still nothing. So I hot doing some research. And it was saying to check my ecm or ecu so I have power going intonmy ecm so I thought it was my ecm. So ibreplacef it yesterday and still nothing the kite does not blink or anything when I turn my car on like irs post to . I checked my main relay and that's good if some one could help me out that would be grate cuz I am stuck I have no clue now
thanks

 

How did you test your main relay?
Was there output power to the ECU?

Check for power at A13 and A15 on the ECU.
If you have power then check your grounds.

 

Have you checked the Ignitor?

 

this!

 

Where are the grounds at I can't seem to find it and I took my main relay and tested it the way it sait in the book and I have power to the ecm

 

Ignitor will power the ECU?

 

Will the ignitor power the ecu and where are the grounds so I can check them too and where us the ignitor at

 

A16 and A18 on the ECU are grounds.
Do a continuity check from those to chassis.

The ground lugs are found at the thermostat housing.
Also make sure the battery to chassis and the tranny ground are all good.
This is the ECU ground lug on a newer engine - same location though.


However, it's odd that you aren't getting a Code 0 if you just don't have ground.

Are you sure the ECU isn't powering up?
You said the light "does not blink or anything" - but now that I re-read maybe you meant the dash light isn't blinking.
Stare at the window on top of the ECU and see if the LED blinks when you turn the ignition switch from 'OFF' to 'ON'.


No, the ignitor doesn't power the ECU.
I was being a smartalec when I responded with that question to 'racejunkie'.
However, he have a point - only if your ECU is actually powering up.
So if the ECU is powering up, and you have no spark, then the problem lies within the distributor.
Common problem is the ignitor, but obviously you would want to troubleshoot before throwing parts at it.

 

Okay so.thoes are the grounds .. and yes I ment that my ecu luke on my ecu is not blinking or anything. When I turn my ignition on or off it does nothing