Assuming you're using the oscilloscope correctly, 1.5 volts pulses are probably too low to trigger the coils. The trigger signal from the stock ECU should be 5V, and that's a common trigger voltage from aftermarket ECUs also. You can measure the 5V reference supply for the TPS or MAP sensors to double-check your oscilloscope measurements. Try unplugging the coils and measuring again, in case the coils are somehow pulling the voltage too low.

 

I figured that 5V was too low to trigger the coils. Those readings were taken at the coil plug without the coil connected.

 

Is there any way you can try a different PowerFC in case there is an issue with the ignition driver. I have a known good PowerFC pulled from a running car. For sale at the moment, but, for a deposit I'll mail it to you and just mail it back when you're done and cover my shipping costs.

Low voltage there is definitely also a sign of poor grounding for the 5v ref circuit in the harness. It's "rare" that the driver goes bad, but this is also very possible.

 

If it is a bad PFC Michael Gagne in Canada does full fixes on the PFC and can also fix bad commanders.

Dale

 

I have tried three different PFC and a stock ECU.

I sent my three PFCs to him yesterday to have them checked/ repaired.

 

Three bad ECUs sounds like either the coils or the harness is damaging them. With the battery unplugged and ECU and coils disconnected, try using your multimeter to check resistance between the coil trigger wire and the coil ground wire. Repeat with the coils connected. Resistance should be very high (over 100,000 ohms) with the coils unplugged and somewhat high (over 1,000 ohms) with the coils plugged in. Then try measuring resistance between the coil trigger wires and each of the 12V fuses in each of the fuse boxes. Resistance between the trigger wires and 12V fuses should be very high (over 100,000 ohms).

 

Update time.

I sent all three PFC to Michael Gagne. He tested them and all three work perfectly. So now I know that the ECU is working.

I tested the AEM coils and they check out. All new and good.

Tonight I was reorganizing my garage and I remembered that I still had my stock coils and igniter. I reinstalled the stock igniter, stock coils, and plugged in the stock ECU. I got spark. This means that the stock wiring is good.

This means that the error must be in the coil harness for the AEM coils. I have a hunch that it might be the coil plugs on the harness. I will replace them when my PFCs return and check again for spark in the AEM coils.

the good news is that, since my stock coils fire, I now know that I can go back to them and use a Twin Power if I have to.

 

Glad you're making progress! Also good to know those PFC's are good, that will also help if you are selling them down the road.

Dale

 

any updates? was it the coil plugs?