Does this have an Automatic shut down relay?

Also where would you start looking for a kill switch associated with the alarm and what would it look like. Any who thanks a lot for all your input. It is much appreciatd.

 

It doesn't show in the wiring diagram what type of signal travels down the yellow wire from the ECU to ICU. You do have ignition power at the 14gauge wire on the other side of th eICU, don't you?

 

I do have power to the other side of the ICM. I pulled the coil and tested voltage there and it measures 12v as well.

 

your not getting spark off the coil directly tho?

 

Have you checked the wires going into the bottom of the PDC (Power Dist Cnt) ? Have seen them push out / drop down and some times broke at the terminal connection .

 

could be a micro toggle switch hidden under the Knee bolster panel .

 

Renix doesn't have a PDC.

 

yea it does, just not a large one lol
or atleast thats what i consider the 4 relays on the passenger fender

 

that is correct, I do not have any spark directly from the coil.

 

have you tried a 3rd coil ? You said you replaced it correct , but just because it's new doesn't mean it's good .

 

Did you verify that you are getting .4-.5 ACV from the CPS, unplugged, cranking? It only takes a minute, and without that she aint gonna go. I get about 5v DC from that second, rearward yellow wire at the ICU from the ECU Btw. It will start and run with the wires to the dizzy unplugged. Unlikely your problem is there.

Also Btw, you can refer to Cruisers writings in the link in my signature.

 

Post a couple pictures of the engine compartment . Next does it have one of these on the pass fenderwell ?

 

Its either a ground out, fried ecu or cps.

Also, you are grounding the plugs and cranking right?

 

Gotta be cranking it
Sounds like cps but u may have already dealt with that

 

I don't think the exact type of signal is terribly important- other than there should be one.
Either the ECU pulls that yellow wire up to +5 or +12V and sinks it to ground to fire the ignition, or it idles it at ground potential and puts out a +5 or +12V pulse to fire the ignition. Problem is neither signal appears to be present, the OP measured nothing at all.
If there is no signal on that yellow wire I'd think either the ECU is bad, or one of the input signals it needs to fire the ignition is missing.

Below is the 1990 ECU connector pinout.
OP has already replaced the CPS. What else here does the ECU need to fire the ignition?