Going over the wiring diagrams for the 2007 2.4, it appears as though there is no ignition control module, rather, the coil packs are controlled directly by the ECM
( link - repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0996b43f/80/7d/c1/49/large/0996b43f807dc149.gif ).

Am I missing something? Further, the autozone repair guide says that ignition timing is controlled by the PCM and can't be otherwise tuned. Are the ECM/PCM one unit on the 2.4 LE5?
I'm absolutely confused by this based on the Autozone and Rockauto websites; Rockauto sells an ECM, but no PCM (but it does sell connectors), and the diagram illustrating where the PCM is located, appears to show where the ECM is located.

Am I misunderstanding something? This question is a result of an attempt to diagnose a problem, but I'm asking because the parts and guides are confusing me. Attempting to locate the ICM in order to diagnose non-firing 1-3 cylinders (was trying to find the path from the coil packs to the ICM to the PCM to troubleshoot problem) led me to the (very possibly wrong) conclusion that the IE5 does NOT have an ICM, and that this task is instead managed on the ECM, though the repair guide says this is managed by the PCM?

But, the PCM does not exist for purchase, but the ECM does, but doesn't exist on the car (again, according to the repair guide). Assuming that one of the two has to exist, and the one that can be purchased is the most likely to actually exist, is it the case that the PCM and ECM are in fact the same part, handling the multiple tasks, including the duties of the ICM? Would it therefor follow then that the "PCM" location, removal, and installation guides would actually all be referring to what is actually the ECM?

I apologize if this is worded poorly, I'm very confused if it's not super obvious, I'm not exactly a car guy, so I'm assuming that I have ether profoundly misunderstood the situation, or I somehow managed to get that correct.

 

You have an ECM, not a PCM
The coils have the modules built in therefore the signal comes directly from the ECM
The powertrain relay powers the 10 amp injector fuse which powers all 4 coil modules on the pink/black wire
All coil/modules are grounded at the same place on the black wire.
All 4 coils share the low reference signal on the brown wire
The 1 pink, 2 orange, 3 light blue, 4 dark green wires are the individual ECM triggers.

 

ecm stands for engine control module
tcm stands for transmission control module
pcm stands for powertrain control module

a powertrain control module is a computer that controls both an engine and an automatic transmission. our cars all use an engine control module, and if the car is an automatic it has a seperate tcm to control the transmission. a car that uses a pcm will never have an ecm or tcm. and just to confuse things more, repair guides often interchange the terms ecm and pcm.

only the 05-07 2.2l uses an icm, or ignition control module, its built into the coil cassette on those engines. you dont have that, so dont worry about it. as mentioned above the coils are supplied 12v all from the same source, they ground at the same place, they have a signal wire from the ecm, they also have a ground wire between the coil and ecm.

first thing id do (you may have already) is to swap the coils around. being 1 and 3 are dead, put the coils from 2 and 4 in those holes. see if the 1 and 3 are still dead or not, if you have bad coils 2 and 4 will be dead now and 1 and 3 will be firing. if the problem does not follow the suspect coils, you have a wiring or ecm fault.

 

05-06 2.2L used the icm, they updated in 07 to coil on plug from the cassette and a different ECM (just clearing up in case others google search and find this.

 

Yep, this was already done, so it appears that the coils are good.

Thanks to everyone for your responses, I really appreciate it, and I am FAR less confused now lol