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

[RA35GT]

Heya mate, I've about to do this conversion soon so I came up with this wiring diagram.


Here is a diagram of two common relays and their pin numbering. (Either type can be used for the conversion)


- Can i reuse the relays i already have?
Yes, as long as they are the right type its all good.

- where does the + from the coil run to?
The coil should get its power from the switched main relay line.

- what does the E2 pinout do
E2 provides an earth for Fc. (I.e. when the afm opens it connects E2 and Fc to turn on the fuel pump control relay)

- What are the cold start items?
The Cold Start Injector Control In Head is a temp sensor looking device that is screwed into the head.


- Can Vb be ran straight to the ECU pinout or foes it have to run off the +B line?
Vb can be run from anywhere along the switched main relay line.

- What is the SPD, as theres no correlating pinout on the ECU?
Not sure about this one.

- Are the main relays already in the original loom?
The main relay is normally located in the fuse box, so it most likely wont come as part of the loom.

- Whats the starter solenoid?
The starter solenoid is what actually switches the large current to the starter motor. If you look at your starter motor there should be one fat wire that goes to the battery and a small wire that disappears into the cabin. The small wire is what is required to trigger the ECU, the cold start injector control and also the Starter aux relay. The starter aux relay is used to turn the fuel pump on when the engine is cranking.

Its fairly early in the morning so I may have made a mistake somewhere up there..

Hope it helps mate.

Rudi

[RA35GT]

G'day mate,

My diagram may be a little misleading with regards to the ignition coil. With it being a 18RGEU it should have a reluctor dizzy. I did not show the connections between the dizzy, ignition module and coil. (As mentioned above the ECU doesn't control the coil it just uses the Coil- as a rpm reference).

Thanks
Rudi

[Spectre]

So I should infact have three relays in the engine bay?

Where do I find the ignition switch wire?

Also, the BAT pinout on the ECU, mine dosnt have one?

[RA35GT]

G'Day mate,

Yeah mate three relays, not necessarily in the engine bay, wherever is convenient. (Spose you could argue that the starter aux relay can be left out, as long as the fuel rail remains pressurised enough it could possibly be left out...)

Well I think the easiest place to find a +12V Ignition switched source would be near your factory coil, it should have an ignition switched wire on its +terminal.

If your computer doesn't have it, you can ignore it mate

Thanks
Rudi

[Spectre]

Ok so if theres no "BAT" pin on the ECU, I dont need it. How does the ECU get power then?

Same with the SPD pin, if its not on the ECU, dont need it?

The Water temp sensor, is that located above the dizzy? A spade connector? Ive hooked this to the original loom. Does the ECU use it for anything in particular?

The "M" on your diagram, is that the fuel pumps?

Do EO1 and EO2 can they be earthed anywhere or should they be earthed on the injector manifold?

[TA-022]

earths an earth .... just make sure their clean uncoated areas etc.

if ya ecu dont have it ... dont wire it.

water temp may be in the themostat housing if its an EFI one... otherwise yeah a spade above the dissy.

[Lambolica]

I may be out on a limb here but I'm 90% sure a 5M-E loom is similar (except with more injectors)

might this be a better place to start?

Cheers
Simon.

[RA35GT]

G'Day,

The ECU can still get power from the +B pin (The one that is switched through the main relay).

If its not on the ECU and there is no pinout on the ECU for it (you did open the case to have a look?) then it means the computer doesn't need to know it.

Unfortunately I dont have my 18RGEU yet so I can't tell you where it is. Make sure you don't confuse it with the other temperature sensor though. The ECU alters the amount of fuel injected depending on the water temp. I think the single spade terminal on the engine would be the gauge sensor so it should go to the gauge. (Sounds like you got this wired right). (The ECU and the temperature gauge use different sensors)

Here is a photo of a MX73 Gauge temperature sensor

Here is a photo of a MX73 Water Temp Sensor that is used by the ECU.

And just for interest here is a photo of the MX73 Cold Start Injector Time Switch.

Yeah, sorry mate, I should of labelled the 'M' as the fuel pump. You can use that wiring for a single factory style fuel pump. If you want to use a bigger pump or add multiple fuel pumps you should run a separate supply for them, with an appropriately sized fuse.

E01 and E02 can be earthed anywhere really, but the factory location is on the manifold.

Cheers
Rudi

[Spectre]

Ah i understand now! I know where the water temp sensor and cold start injector switch are now.

With the fuel pumps, im running a lift pump and a fuel pump, can i run both of these off the relay? Running two wires from the pin of the relay to power each? Is that what you mean?

[RA35GT]

Sweet

Well it would really depend on the current draw of the fuel pumps and also the wiring you use. If you were to use bigger gauge cable (and also uprate the fuse) then yes it should have no problems running both pumps off the one relay (as long as the relay can handle the current). (Bear in mind though since you uprated the fuse you will also have to increase the size of the other wires on the main relay line, because if there was a short you want the fuse to blow before burning through a wire). I wouldn't recommend doing it this way.

If you were to use the normal sort of wiring then I would run each fuel pump on their own supply and relay, as in this picture.


Or Alternatively you could run a single heavier wire to supply the relay, as below. (Make sure you use the heavier gauge cable on the high current pins (i.e. pins 30, 87, 87a), for the same reason as above). (I would do it this way as its the easiest).
http://img5.imageshack.us/img5/628/1...urgetankfu.gif

Or you could run a single heavier wire to supply two separate relays. (You would only do this if the combined current draw is above a single relays current rating)

Note that I haven't put the values for the fuses, this is because it would depend on the fuel pumps. Once you know the current draw of the pumps you can then work out the appropriate circuit, then size your cable to suit and also choose a suitable fuse. (The fuse should be chosen to ensure it would blow before the wire would heat up enough to melt)

Cheers
Rudi

[RA35GT]

G'Day mate,

I was just having a closer look at some of your earlier posts and saw that your pinouts show the ECU having a Vb pinout. If that is the case do not connect Vb to the main relay line as per my drawing. Connect it straight to the ECU.

Sorry about that dood. I only glossed over the thread originally and was only working off the wiring diagram...

Rudi

[Spectre]

Alrite, started pulling apart the entire loom.

Everything is in its seperate piles now, once problem though, I cant work out which wires are which on the AFM





Also, on the EFI manifold, is there two plugs that you dont need? as ive got two plugs (same as injector/water/tps) that didnt go anywhere when I pulled apart the loom?

Cheers,

Bryce

[RA35GT]

G'Day mate,
You should be able to work out which wires are which by comparing the colours of the wires in the loom near the ECU connector end and where they connect to on the ECU (From the pinouts of the ECU i.e. when you open the case).

Alternatively you can follow the wires from the AFM all the way to the ECU and see where it connects too from the pinouts.

Unfortunately I can't help you with the two plugs...

Thanks
Rudi

[airfireman1]

I have an EFI manual that covers the 22RE,2SE,1SCi,3S-FE,2VZ-FE,3SGE,5ME,4YE.
It has complete wiring diagrams including ECU pinouts and all sensors and relays , it is a very complete manual I am sure that some of these will be nearly identicle to what you need for the 18rgu. You can borrow it if it will help.PM me I live north of the river

[RT104GT]

http://people.aapt.net.au/~sg4/18RGEU.gif


Dont ya just love cicuits.

Built a whole computer up in 1984 to run my 3TGTEU.