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No signal to one coil

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Old Sep 14, 2023 | 08:10 AM
  #21  
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Originally Posted by HeyYou
If you aren't getting power to the coil, the PCM isn't going to be able to fire those cylinders......
so even with a new pcm you think that might be the culprit?
 
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Old Sep 14, 2023 | 08:13 AM
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If the coils don't get power, NOTHING else you do will make it work. Gotta figger out why it doesn't have power.

I AM remembering that right, right??? I read too many threads to keep 'em all straight.
 
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Old Sep 14, 2023 | 08:18 AM
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Originally Posted by HeyYou
If the coils don't get power, NOTHING else you do will make it work. Gotta figger out why it doesn't have power.

I AM remembering that right, right??? I read too many threads to keep 'em all straight.
only 1 coil isnt getting power
 
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Old Sep 14, 2023 | 12:21 PM
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Then any cylinders on those coils won't fire. Trace the power wire back to the break. I believe there is a splice in there somewhere.
 
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Old Sep 14, 2023 | 12:24 PM
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Originally Posted by HeyYou
Then any cylinders on those coils won't fire. Trace the power wire back to the break. I believe there is a splice in there somewhere.
I traced it back to the pcm, spliced a wire directly from pcm to coil harness and still nothing.
 
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Old Sep 14, 2023 | 01:21 PM
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Yes, the diagnostic tree is pretty much the same for the 0353 #3 circuit code as it is for the 0351 #1 circuit code I sampled for you.
I don't know where the idea of the pulse comes from. There is no pulse. The computer simply allows a ground to happen, then interrupts it to fire the coil. Been the same since the magneto days ended back when cars started carrying batteries around. Pretty sure.
If you will notice the tree tells you to measure the ASD voltage at the coil, primary resistance, wiring resistance and continuity, etc.
Like I said it is all about wiring, first, second, and third. Get your wiring diagram and trace the plumbing, you'll be able to figure it out.
The last thing on the tree is a defective PCM which is the first thing the parrots tell you to buy after they have you replace a perfectly good ignition coil.
Anyhow, good luck, you'll get it.
 
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Old Sep 14, 2023 | 01:30 PM
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Send your generator code if you like. Can post that tree as well. The two could be related in a defective wiring harness sort of way. Dunno. I'm no electrical wizard and haven't met one in decades. Haven't spent any time looking at your wiring diagram. Nobody seems to have the familiarity that comes from day in and day out focus on auto electrical.
No matter what they post on a forum.
 
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Old Sep 14, 2023 | 01:39 PM
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I will get the other code when I get off work tonight.
 
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Old Sep 14, 2023 | 07:45 PM
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P0622, open or shorted condition detected in the generator field control circuit
 
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Old Sep 15, 2023 | 06:29 AM
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I traced it back to the pcm, spliced a wire directly from pcm to coil harness and still nothing.
Power 12volts comes from the asd relay NOT the pcm! If you are not getting a ground pulse it's most likely the pcm. You said you replaced the pcm correct? If two cylinders are not firing i would think that pcm would be for a V8 and not a V10. Just a thought.
 
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