p0352 and p0353 codes

[mindo389]

Yesterday, my car began to run and idle rough. To take a step back, Sunday I drove through a heavy rain storm, but did not drive it again until yesterday. My scan tool was at my son's house, so I had to wait until today to get it and check out the problem. Anyway, I got the P0353 code, which is an issue with the #3 coil. Checked the connections to the coil, and the remaining 7. Nothing seemed loose, so I swapped the coil with the #2 cylinder and the code cleared. I took the car out for a "interstate tune up" and everything seems OK now. I suspect a damp connection caused the issue, but on that cylinder, that idea seems odd. I'll wait and see if the problem reoccurs when I take it out again.

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[Viper629]

Yesterday, my car began to run and idle rough. To take a step back, Sunday I drove through a heavy rain storm, but did not drive it again until yesterday. My scan tool was at my son's house, so I had to wait until today to get it and check out the problem. Anyway, I got the P0353 code, which is an issue with the #3 coil. Checked the connections to the coil, and the remaining 7. Nothing seemed loose, so I swapped the coil with the #2 cylinder and the code cleared. I took the car out for a "interstate tune up" and everything seems OK now. I suspect a damp connection caused the issue, but on that cylinder, that idea seems odd. I'll wait and see if the problem reoccurs when I take it out again.

I’ve got a very similar issue with my 15 GT right now as well. I have the Power Pack 2 installed. I have current codes for P0352 and P0353. Initially when the issue started (happened all at the same time) I had a P0353 and P0356, as well as a P0302 for cylinder 2 misfire. I found the coil on Cylinder 2 partially melted, and looked like it was arcing to the cylinder head. Replaced that coil and moved around the other ones, and the codes moved to P0352 and P0353 and have stayed in those two cylinders. I diagnosed the PCM myself (Mazda Master tech). Swapped coils, didn’t move again, tested fuse F44 for the coils, fuse is good. Tested for battery voltage at the coils, had battery voltage. Tested continuity through the ground side of the coil to the PCM connector, had good resistance on that, and tested from the fuse to the PCM to make sure the coil connector wasn’t bad. All tested good, so at this point only thing it could be is a PCM, so I got one ordered. Had the car for 2 1/2 years and can’t believe the first thing that fails on it is the PCM. My working theory is that the bad coil caused a short which damaged the PCM, considering the P0302 code set the exact same time as the P0353 and P0356.