18RGEU Wiring Woes (56K BWARE) *It was alive NOW DEAD*

[Jackel]

i got a genuine diagram for a 18rg doesn't have any efi on it but has the basics or depending where you live i could bring my car around and you can have a look at the wiring in it

[Spectre]

Ok almost done! All wires to the ECU have been wired, relays done. Only a few things im not sure about:


VB Wire: theres a pinout on the ecu for "VB" but the diagrams show it intersecting the line from the +coil. Which is right?



Do the fuse holders/fuses have to go a certain way? or are they the same both ways?


My ballast resistor has had two wires cut off. do these matter? It came off what i was told was a running loom / engine.


The 12V for the Ballast resistor - is this it? Its the only wire not coming out of the large plug.


Idle-Up Valve - 12V constant? Where do I join it to?


Which of these two points do I attach the -IG to? Is there a marking on the coil to say which is positive and which is negative?

Also, where can I take Ignition from? Which wires, and where can I find them exactly?

Cheers,

Bryce

[RA35GT]

Ok almost done! All wires to the ECU have been wired, relays done. Only a few things im not sure about:


VB Wire: theres a pinout on the ecu for "VB" but the diagrams show it intersecting the line from the +coil. Which is right?



Do the fuse holders/fuses have to go a certain way? or are they the same both ways?


My ballast resistor has had two wires cut off. do these matter? It came off what i was told was a running loom / engine.


The 12V for the Ballast resistor - is this it? Its the only wire not coming out of the large plug.


Idle-Up Valve - 12V constant? Where do I join it to?


Which of these two points do I attach the -IG to? Is there a marking on the coil to say which is positive and which is negative?

Also, where can I take Ignition from? Which wires, and where can I find them exactly?

Cheers,

Bryce

G'Day Bryce,

If your ECU has a VB pinout I would wire VB to it.

The fuse and fuse holders can be put in either way.

Im not sure of the ballast resistor mate, mine has Five wires going to the ballast resistor, the supply runs up the middle of the four resistors and branches off to one side of each resistor and then the other four wires are connected to the other side of the resistors. Yours may be different and need to be wired differently, since it was running previously its probably right.

The +12V for my ballast resistor is on the same plug as above.

The idle up valve gets connected to the same line as the +coil line, i.e. the switched main relay line, its called an aux. air valve in the diagram.

If you look on coil itself, where the distributer lead comes out, you should see the two connectors either side, they will be marked + and - accordingly, see pic.

There should be an ignition 12V that used to feed the coil+ from your original setup.
On my car its a light brown/peach colour. You should find it around there somewhere.

Rudi

[Norbie]

The ballast resistor looks identical to the one that was on my old 5M-E. Obviously Toyota used the same part for 4 and 6 cylinder engines, but with 2 wires disconnected for the 4 (for obvious reasons).

And yes the small plug coming off the ballast resistor is the +12v for the injectors, connect it to an ignition-switched power source.

[Spectre]

ok I wired everything up. Isnt the ballast resistor wired to the battery? I wired that plug to the battery with a fuse?! Is that right?

It cranked over, but im pretty sure ive got the ign switch wrong. Can anyone show me exactly where to find a source of ignition? Ive checked the original coil, and i only had two black wires that were connected to the + side of the coil. Are these from the ignition?

And do I need to have the oxygen sensor wired up?

Cheers,

Bryce

[Invid]

Whoops ignore that....

[Spectre]

Bump me up

[Norbie]

ok I wired everything up. Isnt the ballast resistor wired to the battery? I wired that plug to the battery with a fuse?! Is that right?

Like I said in the previous post, connect it to ignition-switched power. You don't want power to the injectors 100% of the time, including when the car is switched off!

It cranked over, but im pretty sure ive got the ign switch wrong. Can anyone show me exactly where to find a source of ignition? Ive checked the original coil, and i only had two black wires that were connected to the + side of the coil. Are these from the ignition?

You do have a multimeter right? If not, get one now!

Don't forget there are two power circuits going to the coil, one for cranking and one for normal running. You need to make sure you're getting power to the ECU and injectors at all times, including when cranking.

And do I need to have the oxygen sensor wired up?

No, I never used one.

[Spectre]

Ok so I need to move the ballast resistor. Is ignition switched power the coil?

So one of the two wires from the original loom to the coil will be the wire I need for IG switch?

[Norbie]

Yes and yes.

[Spectre]

The Latest!



It Works!

After having trouble getting the ECU and fuel pumps to come on when I turned the key, I double checked all my wiring for any shorts or missplaced wires.

Everything was spot on.

I then realised there was an external earth wire coming out of the ECU! So I earthed it, turned the key, and a couple of tries later, the RG came to life! (waking most of my street at approx 9:00 in the morning on a sunday) The sound of a rough idling RG with no exhaust is awsome

Only thing is, that once its on, if i try to turn it off by taking the key out of the ignition, it continues to stay on!

Any idea's what might be making is stay on, even after ive taken out the key?

The ballast resistor and the IG Sw are both wired to the + side of the coil.

Bryce

[Spectre]

BUMP

Still looking for any ideas on why it stays on after iginition has been turned off.

[thechuckster]

you haven't setup the main EFI relay (or the cuicuit-opening relay if you have one) correctly.

My gut feeling is that your ign switch is not controlling the main EFI relay - and the only purpose your key-switch is performaing is to enable the starter motor.

[Spectre]

you haven't setup the main EFI relay (or the cuicuit-opening relay if you have one) correctly.

My gut feeling is that your ign switch is not controlling the main EFI relay - and the only purpose your key-switch is performaing is to enable the starter motor.

The main relay is wired to turn on when the ignition is turned on via the + side of the coil.

So when the key is turned ON, there should be power to the Main Relay, when the key is turned to OFF, there should be no power to the coil, and so the main relay should turn off.

Is this right? Or should the Ig Sw to turn the main relay on be somewhere else rather than on the coil?

[Spectre]

After looking at the diagram again.. I think ive realised what is wrong.

The Ig Sw to turn the Main Realy "ON" dosnt have to be 12V, and so shouldnt be on the coil. It should split from the IG wire from the ignition barrel, so that when the key is turned on, the main relay is switched on, which gives it +12V from the battery.

Then when the key is turned "OFF", it closes the relay, stoping the +12V from the battery, and hence turning the engine off.

Does this sound right or have I simply confused the matter even more