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Are you missing spark at the back 3 coils and also the front 3 at the same time? Unfortunately, the power feed for the coils, the injectors, oxygen sensor heaters, and fuel pump relay all come through the ECU RLY Fusible Link 30amp. Then through the Engine Control Relay, and then branch off from there. So, you might want to check more around that fuse panel, If the harness is wrapped up in conduit and taped up, I don't think you'll find chewed wires inside there, I guess depending on the rodent size, but they will usually chew up the entire thing. I need to restart my page here, having some technical issues.
So, depending on if you're missing power on the back coils or control, it will direct where you look next, being that the PCM is located next to the Air intake tube and air filter box, you might want to just pull all that out of the way. Looks like the PCM harness runs under the air tube, and since you have no spark back there, I'd be concerned with hydro locking those back cylinders and having to pull that intake off so many times, you probably just want to go through the entire engine harness. Checking the engine and chassis grounds. These Grounds in the 2nd diagram 109, 110 all go to the PCM, there is 5 there, all Black wires. If the rear coils wires are still there, then there is most likely going to be issues from that engine Junction Block (fuse block) to the PCM. The wiring in this vehicle is so different from the rear to the front of the engine.
The back 3 coils run through a bulk connector CC101 for the control wires and a single power wire. Whereas the front coils have no connectors at all in series.
The CC101 is supposed to be a 4pin connector that feeds power to the rear coils on Pin 1 Pink Wire and the other 3 pins are the control wires for those coils. Should be White, Black and Yellow wires.
The CC102 bulk connector feeds the rear injectors. So, you could even just unplug that CC101 and check for resistance from the pink wire, to each of the other 3 wires one at a time, and you should be measuring the resistance of each rear coil, instead of having to pull the intake, then if anything is missing, you'll know what wires you're chasing.
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Jun 27, 2023 at 11:35 AM