No injector pulse!!! update

[turbocrazy]

I thought the cps send the signal for spark and triggered the ground for the Injector. What would you think it would be??

 

[hvyman]

The cps wires need to be shielded as well. Can not just wire it like radio wiring.

How did you verify for spark?

 

[hvyman]

Do you have the injector resistor plugged in?

 

[turbocrazy]

Ya I've verified spare with cps in and out (spin manuel) and spark is fine and the new wires are shielded. I'm gonna say I do have the resistor plugged because my wires are hot and the resistor is on the hot side in the diagram and the ecu side supply's the negative. Anyone have any other ideas? I'm about to say screw it and get a fuel/ignition stand alone

 

[supraguy@aol]

Have you followed the exact troubleshooting steps of the TSRM?
It contains the procedures for diagnosing the entire ignition/EFI system.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=11

 

[MK3Supra17]

What am I thinking about? Both sides of the inector clip has 12v and from the readings we got with the noid light no negative. Now the weird part is we did get injector pulse for a min but as soon as we plugged them back in to fire it up it lost it again??

just because a noid light doesnt work that doesnt mean the driver in the computer isnt pulling to ground. a shorted injector on a group fire system (2 injectors per driver, in this case) will cause the injectors on that circuit not to fire. unplug both injectors that use the same driver and check with a test light connected to battery positive to the control wire for the injector to see if the driver in the computer is pulling to ground. if you have spark then you do not have an input problem and the CPS isnt your guy.


EDIT: got a diagram off of shop key and highlighted how the control circuit works. its for an 89 supra so wire colours could be different for your application, but the way it works is the same.

 

[turbocrazy]

Still having no luck with anything pulled up a trouble shooting pin out but it doesn't match my ecu there are to many pins on the pin out I printed still no ground on my injectors re did wires to afm and cps will the car not run with egr and O2 gone

 

[supraguy@aol]

Here's the correct ecu pinout for 87-88 turbo.

Go to the online TSRM and follow the troubleshooting steps.
If you follow the tsrm, you will figure it out. Don't give up like this guy(wierd- he has the same problem you do).

http://cookeville.craigslist.org/cto/4910616884.html

 

[turbocrazy]

Ya that's my car

 

[jetjock]

What Supraguy said. Twice. It's a sure cure for operator headspace error...

 

[turbocrazy]

Does the ecu have to see voltage on wires no.10,20,30 to send the correct signal to the injectors to fire? I about to rip the wire harness out and rebuild it

 

[jetjock]

Those are the injector grounds and must be connected. All the ECU needs to provide injection output is power and ground on the proper terminals and a crank angle input. It really shouldn't be a difficult problem to resolve. Just measure everything involved a meter. That your MIL illuminates means you're already halfway there.

 

[turbocrazy]

checked more stuff everything is still good havent found anything come back negative. can anyone tell me what wire sends the signal to the ecu that tells the injectors to fine thats all i wanna know right now what sends the signal that says go to ground to make the injectors fire can anyone tell me that please

 

[Nick M]

The pickup sends the engine time and position signals. That is the CPS. Duration and timing is also calculated with the airflow signal. Small corrections are made with the intake temp and coolant temp.

 

[jetjock]

Welp, I'm done. Gave it my best shot but no joy as we say in the biz...

 

[supraguy@aol]

Start here.
http://www.cygnusx1.net/Supra/Library/TSRM/MK2/manual.aspx?S=FI&P=11

 

[turbocrazy]

I'll try some of those I've tryed most of the trouble shooting ones but I can't do the test idling because it won't start from what I've got out of the trouble shooting tests my ecu is shot and I need a new one is there a way to test mine? Don't wanna buy one and it not work

 

[MK3pizzadriver]

If the ECU is putting out positive voltage to the injectors, I think it's pretty safe to say it's shot lol (assuming there isn't a short somewhere). Don't think you can test it, you just test everything else to determine it's the culprit

 

[turbocrazy]

Well from everything I've tested nothing has shown its ugly face to be the problem and one of the troubleshooting checks said if all this passes and it still doesn't work try and new ecu and I've also noticed I'm getting 12v on both sides of the injector clip only if the other clip that's tied in is plugged to the injector?? Is that suppose to happen is it suppose to back feed the 12v through the injectors and back to the wires that go to the ecu?

 

[Rollus]

Having 12v on both sides shows injector is OK.
ECU job is to ground the side where you have 0V when unplugged from the injector.

For everything else this:

Those are the injector grounds and must be connected. All the ECU needs to provide injection output is power and ground on the proper terminals and a crank angle input. It really shouldn't be a difficult problem to resolve. Just measure everything involved a meter. That your MIL illuminates means you're already halfway there.

Check and set CPS and TPS.