I’m rebuilding the engine wiring harness.
Original was very brittle. Car was running okay (after some work), except it was giving me FF34 after test driving it on the interstate and then sitting at idle shortly after. I pulled the injectors and one wasn’t clicking.
I was cleaning up the vee which led to this harness rebuild. Every time I touched the harness it would fall apart. If it was working before it certainly wouldn’t now. As you know, the injector harness is wrapped together with a lot of other wiring in the engine bay. The power module/ignition coil wiring wasn’t in any better shape.
Whatever they used to tape these splices did not age well:
So now the wiring harness has been pulled out, cut off near the boot that leads to the passenger footwell to the various ECUs.
It actually seems pretty straightforward once you have everything unwrapped and start separating the discrete pieces. Easiest one to separate is the Fuel injector harness (makes you seriously question why this was wrapped with the whole harness). Once you split up the 9-way connector there are a few more that can be separated - Oil pressure switch and transmitter is an easy two wire standalone section.
A couple of questions though. I’ve searched around on the forum but didn’t come up with anything.
What is going on here, some sort of diode, but anyone have specifics?
This one by A coil:
This one by the AC Compressor:
What was the idea behind mounting the power modules on the radiator support, do the aluminum plates serve as heat sinks and they put them there for airflow?