| Author | Topic |
|---|
Location:
Melbourne
Registered:
March 2004
|
|
Engine Conversion Wiring - What is involved?
|
Fri, 25 March 2005 02:34
|
 |
Ok, noob question: Say I want to drop a newer generation engine of the same family (3S) into the Celica. What exactly would be involved in wiring it up? I'm assuming that the engine wiring loom (sensors and ECU) is separate from the chassis (lights, accessories etc)? If this is so, could I just drop the entire wiring loom from the donor car in, plug it back up and drive away? Or is it more complicated than that? Im pretty handy with the ol' soldering iron and thinking of attempting this job myself sometime. Or is it something that is better left to a professional?
- Andy
BTW: I tried searching for info but couldn't find a straight answer. 
|
|
|
Location:
W.A
Registered:
May 2004
|
|
Re: Engine Conversion Wiring - What is involved?
|
Fri, 25 March 2005 03:39
|
|
Hey!
Thats kinda what I'm doing right now: I'm swapping the wiring from an ae92 gtz hlafcut into an ae85.
Yes the engine loom wiring is seperate to the chassis lights etc. This is the case on my halfcut, I think it's the same for most if not all cars.
However (from my halfcut) the ecu connects to some accessories in the car... eg
- instrument cluster
- A/C fan etc. (For increasing idle speed with load?)
If you are changing ecus you will probably have to cut/solder some of the above old plugs to new plugs, which will be tedious but simple.
- Also some mucking around with the fuse box will probably be required.
Other than that there shouldn't be any problems! Just make sure you label everything when you unplug the loom, so it's easy to connect back up.
I'd say if you can solder then you can do it yourself.
btw I'm new at this too, and I haven't tested my wiring yet!! So maybe someone else could give their opinion?
Good luck anyway!
|
|
|
Location:
Melbourne
Registered:
March 2004
|
|
Re: Engine Conversion Wiring - What is involved?
|
Fri, 25 March 2005 04:20
|
|
Sweet. That's good news then! So the only splicing that I'd need to do would be at the ECU connector? I'd be using the ECU that comes with the motor / halfcut. What connections did you have to make at the fusebox? Thanks for that, let us know how you go!
I've been studying the wiring diagrams in the haynes manual, it looks fairly straight forward... but in my experience it rarely is. There's also this pretty good flow chart type thing which shows the connections the ECU has.
|
|
|
Location:
W.A
Registered:
May 2004
|
|
Re: Engine Conversion Wiring - What is involved?
|
Fri, 25 March 2005 06:22
|
|
Yup I'd say so! From my halfcut, the accessory loom connects only to the fuse box and to the ecu. So from your ecu diagram you only have to worry about things like the 'check engine light', 'neutral start switch', 'brake switch' and ignition. All this should be simple swapping of plugs, or might even plug straight up as it's the same family of engine.
I didn't have to make any different connections with my fuse box, because I'm using both wiring looms - the engine loom and the accessories loom.. Pretty much swapping over EVERYTHING (inc dash) from the halfcut to the car.
So the only splicing I will be doing will be to connect up the lights (brake, indicators etc), and the headlight retractor control.
For your fuse box you will probably just need to swap plugs on connections going to power accessories. An even simpler way, but messier would be to leave your old fuse box in, but add the new one as well, and connect both to the battery... This way your old accessory loom connects to you old fuse box, and your engine loom connects to the new one. Should work, although I've never tried it!
Try to get a wiring diagram for your car, someone on here should have one! I was lucky as the ae86 one is in tech docs. This will help heaps with wire colours etc.
|
|
|
