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No power to coil, cas, cps

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Mischif

15+ Year Contributor
563
8
Mar 31, 2008
El Paso, Texas
So i'm trying to help my friend get his 97 eagle talon running. Its suffering from no spark or injector pulse. All fuses tested good. So far i have found that the coil is not getting a constant power source to the middle pin. I checked pin one on the cam angle sensor and it is not receiving the 8volt constant power source either. So i tapped into pin 44 on the ecu that powers the cas, cps, and vss about an inch away from the ecu and it is not putting out 8 volts like it should. Also while cranking the coil doesn't get power either. So i jumped the pin on the asd relay, and when jumped the coil gets power but still does not fire.

Now the previous owner replaced the ecu to try and fix the problem but it didnt fix anything. I believe the ecu is fine. I say this because when you first turn the car on, the check engine light comes on for a few seconds then turns off. I will note that while pin 44 does not put out the 8volts like it should, it does put out about 0.25 volts. Also it doesn't seem like the ecu is sending the ground signal to the asd relay either, since the only way the coil will get power is if i jump the terminals.

So my question is does it sound like the ecu may possibly be bad? Or could i have a short somewhere in the wiring that relates to the pin 44 that powers the cas, cps and vss?
 
Ecu has a void warranty lable on it preventing it from being opened. Once i figure out the status on the warranty, i'll open it up if its no longer under warranty.

As for the mpi, from what i understand that is what the asd relay is on a 420a. Which has been checked already, and is not getting a ground signal from the ecu.

UPDATE:
So after reading through some threads, i got an idea on a few things to try. Unplugged the ecu from the harness and tested pin 44 again. Still getting about half a volt to it. After playing around with the wires behind the manifold i got pin 44 to read zero. Plugged the ecu back in, and now pin 44 is throwing out the 8v it should. Car fired right up. So it turned out to be bad wiring.
 
Last edited:
Please elaborate which wires behind the manifold this sounds really close to the problem I'm facing right now.
 
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