So the slow, tedious job of rebuilding all the engine compartment wiring harnesses continues. You have to remove the harness, unwrap it, clean and inspect all the individual wires, replace any wires where there's insulation damage, clean/replace all the plastic connectors, bundle it all back up, and fit it back into the car.
I got the fusebox mounted and connected, but I can see I'm going to have to pull it out again, and cut apart some of the cable lacing I did, It fits "OK", but doesn't really fit "Nice", so that'll need a bit of tidiness applied.
The last harness being worked on is the one for the Engine Control Unit ("TCCS" in Toyota-Speak), and it's pretty bad. This harness goes on the firewall behind the engine, and then has numerous "breakouts" in the harness to connect to the sensors, fuel injectors, cold-start injector, and other bits and pieces on the engine. Since it lays on top of the engine, it's subjected to all kinds of abuse like high temps, oil, fuel, and coolant vapors. Not exactly a very benign environment for a wiring harness.
These are the six connectors for the individual Fuel Injectors. The plastic has broken on most of them, and the metal retainer is missing on others.
So I sourced the correct connectors, bought some high temperature wire, and proceeded to make these nine connectors with 7" long leads on them. These will get spliced into the harness to replace all the damaged ones.
So, the Fun and Games continue with the wiring, and I'm pleased to announce that I finally got off the pad with this project, as other things are getting bolted on the car, and shelves are getting empty in the garage.
Keep hydrated, and keeps yer heads on swivels!
Sounds like you're getting into the nitty-gritty of the electrics on the Supra. Congrats!
ReplyDeleteYep, Counting Electrons is my game.
DeleteYour patience is phenomenal! I've seen your work - close to Jay Leno standards.
ReplyDeleteJay has more money then I do, and more skilled people. I'm just an old Hot Rodder working in half of a two-car garage.
DeleteUgh... I 'hate' wiring... you're a better man than I am!
ReplyDeleteBeen doing this stuff since I was ~10 years old. If you learn how to break it down into individual circuits it gets easier. Plus I have all the Toyota mechanical, body, and wiring technical manuals.
DeleteWiring in the engine compartment can be quite fickle. I had a 1984 Volvo 240 station wagon (Fastest Tractor in the World) that had insulation cracking and falling off the wires in the wiring harness in the engine compartment. It was completely unreliable and when it rained it caused problems. I paid to get it fixed as it was one of our primary drivers.
ReplyDelete