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Discussion Starter · #1 ·
Having a hard time finding out what this letter system means?

Had a p0354 code, which means an issue with Ignition coil "D".

What is "D"? The coil put into cylinder 4, which would be the closest to back of the engine? I'm so confused.

Thank you
 

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Discussion Starter · #6 · (Edited)
Damn, I labelled it the other way around. I thought that was "D" behind the Engine Oil Cap. Now I'm more confused, because isn't that closer to the back of the engine? Why would that be "A".

But thanks alot visual Steve108



EDIT: you probably right. The belts are on the right side of the engine/ passenger side, which means thats the front of the engine.
 

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Discussion Starter · #7 ·
This is also confirmed by another member Steve108. Guess problem is solved.

 

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#1 cylinder, or, if you want to call it A, is always one next to timing belt or chain, where engine front is.
That code does not appear to be cylinder specific, actually, if you read entire description well. I have no doubt you checked the link, even before I posted it, but there is more to it than just jumping at letter or digit. Also, there is nice passage in it about misdiagnosing that code for coil, while there are other causes.
 

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Discussion Starter · #9 ·
Yes I'm aware. It has nothing to do with the cylinder, specifically. It's the ignition pack. The code itself can mean faulty spark plugs, faulty ignition coil, vacuum leak, air control valve malfunction, etc. I was just assuming that since I never took out the coil, cylinder 4/D would have ignition coil D relayed to the PCM via the factory wiring

I am planning to swap the "cylinder D" iginition coil with "cylinder C" and see whether I get a Ignition C malfunctions. But another member told me to take both the spark plug and coil out and look for blue or orange color at the arc of the plug
 

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Yes I'm aware. It has nothing to do with the cylinder, specifically. It's the ignition pack. The code itself can mean faulty spark plugs, faulty ignition coil, vacuum leak, air control valve malfunction, etc. I was just assuming that since I never took out the coil, cylinder 4/D would have ignition coil D relayed to the PCM via the factory wiring

I am planning to swap the "cylinder D" iginition coil with "cylinder C" and see whether I get a Ignition C malfunctions. But another member told me to take both the spark plug and coil out and look for blue or orange color at the arc of the plug
My wife's 2010 Prius uses the same plugs and I just changed them at 116k miles. It was time. New vs old.
296109
 
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