No Injector Pulse!!

[Alexrx7]

hey guys had an auto elecy over not long ago he said i had no injector pulse most likely a busted ECU so i got a new ECU and still the same problem what else could be causing this? thanks

[ke70dave]

didnt you have a thread about this already?

 

do you have 12V on one side of the injector? that is switched from the ignition (big orange/red wire, that also powers up the Coil, and a few other things)

 

if so, make sure all the grounds in the loom are connected to ground. there is a ground on the inlet manifold i belive.

 

http://www.club4ag.com/faq_and_tech_pages/ECU%20Japan%20AE86%204A-GE.htm

 

above is the pin out for the ecu.

 

the way i belive that it works,

 

6 E02 Brown Engine cylinder head earth point ECU Earth

 

is ground, and the ecu switches this with:

 

7 #20 Blue All Four Fuel Injectors Fuel injector trigger signal

 

to give a grounded injector pulse to all 4 of the injectors.

 

to be honest there isnt alot we can help you with over the internet, all the wiring diagrams are out there you just need to study them and figure out how it all works.

[parrot]

Yep, injectors need a power source. Again, I think I linked you to the diagnosis manual previously which breaks down the circuits which makes it simpler to understand and replicate.

[Alexrx7]

Yea cheers guys ive checked all earths and they are fine but i found a loose black and red wire near the ECU ive looked it up on google and I'm pretty sure its the wire for the TVIS VSV solenoid, ECU ‘B’ & ‘B1’, Idle up computer & Circuit Open Relay power feed. Any one know if this would cause no start and where i should wire it too? thanks again appreciate the help this things been a bitch to solve!!