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Mazda cx7: 07 cx7 has no spark , sparks only once on cylinder…

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07 cx7 has no spark...
07 cx7 has no spark , sparks only once on cylinder one
Submitted: 2 years ago.Category: Mazda
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Answered in 10 minutes by:
4/15/2016
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Jared D
Jared D, ASE Certified Technician
Category: Mazda
Satisfied Customers: 2,263
Experience: Shop Supervisor at County Fleet
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Hi,Are you getting any communication with a scan tool at the data link connector?
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Customer reply replied 2 years ago
Yes we are
Customer reply replied 2 years ago
The codes are p0118, p0123, c342D, po55, c3064, c2174, c2520, c0361, c2e63, c256c.
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
There has to be a harness loose or disconnected somewhere with all of those communication network codes. Have you checked power and grounds to the PCM? There are about 6 ground points on the engine/chassis on that car. You might have to check them all. Can you check for resistance to ground at the PCM? It would tell you if you have a loose ground.
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Customer reply replied 2 years ago
there is a small gauge wire coming out of the harness that powers the coils that is not hooked to anything and i'm not sure what it hooks to.
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Let me see if I can tell where is goes on the wiring diagram.
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Customer reply replied 2 years ago
its the only wire like that on that harness
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Can you tell what color it is?Here is the wiring diagram for the coils:
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Customer reply replied 2 years ago
black
Customer reply replied 2 years ago
so is that the one i see going to the capacitor?
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
NO, the one going to the capacitor should be green. I'm not seeing a black wire. Are you sure it's not blue? Can you attach a picture?
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Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Sorry, I didn't mean to capitalize "no".
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Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
I'm going to call it a night. I'll check in with you tomorrow to see if you need additional info.
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Customer reply replied 2 years ago
ok thank you
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
Any progress on identifying that wire from the coil pack?How about checking grounds at the PCM?
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Customer reply replied 2 years ago
so any ideas about the wire in the photo, black with white stripe with the brass colored square eyelet.
Mazda Mechanic: Jared D, ASE Certified Technician replied 2 years ago
That definitely looks like a ground strap but it's hard to say. That would explain why it doesn't show up on the ignition coil circuit. They generally don't list grounds. Can you test the wire with a meter to see if there is any voltage signal from it?
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