ae82 body harness

[LO01UX]

im putting a 4agze into my ae82 rolla, the main issue i have is that the wiring harness from the gze doesnt have the body harness plugs like the 4age did, anyone got any ideas?

ive done a search but there are no diagrams or anything as to what you hook up etc

[The Witzl]

you need to use a multimeter, and adapt the GZE loom to suit your AE82.
They dont just plug and play

Alternatively, pay someone to wire it.

[Chrisso]

Plugs are the same as a number of other similar year models, the camry comes to mind, so get one from the wreckers. While you're there get the circuit opening relay (COR) which is wired like this:

http://www.rollaclub.com/faq/index.p...g_Relay_Wiring

Send me a PM with your email addy and I'll send you a copy of a wiring diagram I've got. It's for the AE86, but it should still connect the same wires. I've also got a simplified diagram for the AE82 so I'll send that too as I can't remember which site I got it off. I think it was club4ag

Chris

[LO01UX]

Adapt it in what way? As in use the plugs off the old body harness n wire them into the same wires on the gze harness?

[The Witzl]

thats what i usually do. I rewire the loom from the new engine with the plugs that match the car it's going into.....so that the new loom plugs in like factory.

Of course this requires testing all the wires and making sure you match up the right wires. There will also be a couple of wires in the GZE loom that arent in the AE82 body loom, so i usually just add an extra plug/socket for these new wires, and add the new wires to the AE82 body loom

Sounds simple

[Chrisso]

[QUOTE=Sounds simple [/QUOTE]

The truth about electricals! Sounds simple but is a pain in the arse. Make sure that you pay attention to wire gauge for any new wires. If they're grounds it's better to err on the side of large.

If you've got a 4age in there already, you should be well on your way. Take your existing loom, making sure you label everything, take photos and notes, lay it out next to your gze loom. Check both with a multimeter using continuity to check which wires go to where. Change plugs as needed and same with adding new wires and then plug it all back in.

Got your message so I'll email you the pdfs shortly. Be prepared to be frustrated!

Chris

[The Witzl]

yes - frustrated indeed.... but be patient, and take notes as you go.

What chris suggested above is a good strategy, and the best way to work it out.

[Chrisso]

Damn your quick!

PDFs sent.

[LO01UX]

ok well ive joined the harnesses and it all looks good engines back in and it turns over.... but it doesnt start!

what exactly does the circuit opening relay do? is that what gives power to the injectors and efi relay?

done a check and theres no spark or power at the injectors so getting a bit frustrated now

[Chrisso]

Did you have a look at those wiring diagrams?

The COR is used as a fail-safe means of powering your fuel pump. The relay opens initially when it's fed power from the ignition at "start", and then the ECU provides power to latch the relay open during running. The ECU won't provide this if there's no signal from the ignitor/distributor, depending on whether you've got a VAST or ESA ignition setup.

The injectors should be getting power directly and the ECU grounds them to complete a firing sequence. From memory the power is fed through the resister which is also linked to the coil. Check that you're injectors are getting 12v, and if that's the case then the ECU isn't grounding them. This isn't surprising if you're not getting any spark.

Check that you've got your dissy and ignitor hooked up properly. As above, not sure if you've got VAST or ESA, but make sure that the right feeds are going to the ECU. If the ECU doesn't see an ignition event then nothing else will work because it thinks the car isn't running.

As an after thought, just make sure you've got compression as well.

Chris.

[LO01UX]

I don't know what VAST or ESA are so can't answer that, ignition wise it has coil packs,

The ecu that I have, which is the gze one, has one plug that the guy I bought it off butchered the wires n connected them to another relay but im not sure what for,

From what I can see the open circuit relay isn't connected to anything atm as the ecu plug it was connected to isn't connect to the new ecu if that makes sense

[LO01UX]

Im a bit of a noob when it comes to wiring but my dads been helping me as he's a mechanic aswell n knows a bit more than I do, so all and any help is welcome

[Chrisso]

Don't apologise for asking questions. Everyone starts somewhere.

Try this site for an explaination of VAST and ESA [www.autoshop101.com] I think it's no.96 in the tech articles. The difference is the way the dissy signal is processed.

For the COR use the link I posted in my first post and the two pdf pages I emailed you which shows what each pin of the ECU plugs are connected to. The COR is on there and you'll be able to work it out from there. If I can do it, you definitely can too. The butchered plug should be the 14 pin one and it's cut up because it goes to the COR and the body loom.

[LO01UX]

That first link didn't work so could u repost it please?

The butchered one has more that 14 pins but sum are doubled over and connected to the one next to them

[Chrisso]

http://www.rollaclub.com/faq/index.p...g_Relay_Wiring

Okay, that link should be better. Can you confirm that the butchered plug is one of the ECU ones? How many pins does it have?

Have you matched the plugs with the diagrams I emailed you? Those diagrams tell you what each pin should be connected to, so check to make sure this is correct and note/tag any differences.