5L EFI wiring into VK

[DANNY8]

Just need a bit of help with the following wires, anyone know what they connect to? It's a VN 5.0L loom.

Green wire.


Is this for the oxygen sensor?


Wat's the go with these 2 wires cut and joined?


One on the right is for the oil pump sender (I assume), what about the one on the left?


Is this for the trans? If so, can I just leave it disconnected? I'm running a trimatic.

[Darren_L]

looks like a bit of a hack job on the harness!

1. not 100% sure, I think it's the A/C compressor wire.
2. is it a brown wire ? if so, just a tacho lead (used to hook up a test tacho)
3. is that a pink & a white wire ? if so they are usually ignition/coil leads
4. I can't see the plug on the right very clearly, but yeah appears to be the oil sender connector. Lead on the left looks like an 02 sensor lead
5. MAP sensor

[RVK 355]

Darren_L is on the money,but not to sure what the 2 cut wires are, because they are on the cabin side of the loom, get a wirring diagram and trace them back.

[DANNY8]

Thx for the help guys.

Few more queries. Do these labels all look ok?


4th gear input and converter lockup - Do I just leave connected to nothing?
Trip computer and speedo - Just leave not connected? Or does it need the speedo? If so how could I get that to work?
Neutral safety switch - Do I just hook that up to the VK switch and does it get earthed out of 12v? I guess if the VK uses the same sort of setup I only have to hook up the one wire and the wire on the opposite side of the neutral switch should be sweet.



Constant power - I guess this goes directly to the battery, should it be fused? If so wat size fuse?
Fuel pump relay control - Does this go to a relay for the fuel pump? If so which pin?
Oil pressure sender- Not sure about this as there's a wire already goin to the oil pump, and if this was for the dash I guess it would be at the other end of the loom??
Oil pressure sender output for fuel pump - Does this go to the fuel pump relay? I guess this would mean the "oil pressure sender" wire (above^^) could need to be connected to a 12v source?
Injector power feed from relay - Is this connected to the output of the EFI relay?



All aircon wires won't be required so I guess they don't have to go to anything.
Brown at DFI module - Got no idea on this.
Temp sender - Is this 12v for the temp sender? So just needs to be connected to a 12v source?
Oil sender for light - Not sure on this.
Tacho feed - Not sure on this.

I made these diagrams about 2 years ago when I was looking at going EFI. Took photo's of me loom and tried labelling them going by a post by delcowizzid in a project thread. But yeah never ended up doing it so still workin all this out lol.

Any help would be great! I realise a few I can get from a wiring diagram so will have a suss now.

[DANNY8]

Wish the motor in the car was functioning...rekon I've got the 1st 2 pics above sussed out and can start wiring, but can't test it lol.

About the speed sensor wiring, apparently ya don't HAVE to have the speed sensor connected, it just runs a bit better with it. Like when ya stop and idle it can cause it to stall sometimes, shit like that....but that won't matter (unless it happens all the time) so will leave that disconnected too. Apparently some people don't use it so we should be good.

Still not sure about the 3rd pic (grey plug). The "fan relay control" and "ac relay control" won't matter as we're not running aircon, and we'll be using a clutch fan....but yeah the others on that plug I'm not sure about. Anyone know?

[mr j-man]

hmmm as for the white/clear plug... the dude i bought my harness off of said that plug is only used if you are runnin the t700 and to leave it disconnected....im not too sure on his theory tho! my vh is getn wired with the same loom at the mo by an auto sparky... im running a t350 so when i c him 2moro ill know for sure what he has and hasnt hooked up

[mr j-man]

some of that sh_t just does my head in! when it comes to wiring on cars i leave it to the pros...not worth the potential disaster it could cause...haha! i threw a msd 6al into the equation to make things more complicated too! better him than me!

[DANNY8]

Yeah I'm the same when it comes to wiring, it does my head in, but I do enjoy working it out and saving a few bucks. When it pisses me off and I'm about to smash sumfin I just have a break and do something else....and I normally think about the electrical issue and normally think of sumfin to try and hey alot of the times I end up sorting it out, a break is all that's needed lol.

Altho I spent around $500 a few months ago on my Triton just getting the bloody thing charging...and the sparky found out the glow plugs were on all the time causing them to drain everything which is why I thought the alternator was rooted. That was the first time any of my cars have ever been to a sparky haha.

[DANNY8]

Hey does anyone know where the loom goes which connects to the grey plug? I'm pretty sure the green and blue wires are the colour for the dash lights for the oil pressure and water temp, so maybe that's wat they're for?? And the tacho feed I guess is for the tacho in the dash. The DFI module wire I guess I don't need connected as it doesn't have a DFI module.

If all this is correct I rekon I know enuf to get it all working!

[Darren_L]

About the speed sensor wiring, apparently ya don't HAVE to have the speed sensor connected, it just runs a bit better with it. Like when ya stop and idle it can cause it to stall sometimes, shit like that....but that won't matter (unless it happens all the time) so will leave that disconnected too. Apparently some people don't use it so we should be good.

yeah it will run without the speed sensor, but you won't get torque convertor lock-up without it, the ECM won't enter 'lean on cruise mode', and after a few months of the engine stalling and/surging when you pull up... (believe me it eventually gives you the shits) you'll probably want to fit one. Easier now than later.

[DANNY8]

We're running a trimatic so the converter lockup won't work. The car won't be a daily driver so I'll pass on the speed sensor for now. Might be a bitch to get working due to running a trimatic.

[mr j-man]

yeah it will run without the speed sensor, but you won't get torque convertor lock-up without it, the ECM won't enter 'lean on cruise mode', and after a few months of the engine stalling and/surging when you pull up... (believe me it eventually gives you the shits) you'll probably want to fit one. Easier now than later.

is this the part where they hook up a "T"drive to the speedo cable to supply a digital output signal to the ecu????

[delcowizzid]

Just need a bit of help with the following wires, anyone know what they connect to? It's a VN 5.0L loom.

Green wire.

rpm test wire doesnt connect to anything
Is this for the oxygen sensor?

same here rpm test spout
Wat's the go with these 2 wires cut and joined?

dont know
One on the right is for the oil pump sender (I assume), what about the one on the left?

oil pressure and o2 sensor
Is this for the trans? If so, can I just leave it disconnected? I'm running a trimatic.

map sensor plug needed LOL

[delcowizzid]

grey plug by battery is all dash stuff and fan trigger wires .white under dash plug is mostly auto stick harness and speed sensor plus check engine light and ignition feed to turn ecu on.black plug with oil pressure feeds dont even hook the orange and purple wires into the fuel pump wiring just use the fuelpump relay control trigger wire to a relay you dont really need the backup circuit on the oil sender.i do make up power heads that just plug straight into the factory plugs and to battery and fuel pump and fan wiring to just plug and play so it runs and is all fused and relayed ready to mount if you get stuck LOL

[DANNY8]

Thx mate. How much do u charge for ur plug in looms? Just in case lol.

I've got the 2 plugs from the car harness which the engine harness plugs into near the battery, just need to get one for the white plug under the dash, just so it can all be plugged in, instead of hardwired in. I assume the V6 plugs are the same hey?...Just for future reference. I've got a 5L loom, just mean the plugs in the other wiring for the 5L loom to plug into.

Also, would the delco ECU be ok to leave "AS IS" to run 6-7psi? If not, would one of the "chips" u modify be enuf to get it working ok?

[Darren_L]

is this the part where they hook up a "T"drive to the speedo cable to supply a digital output signal to the ecu????

it's just a T-piece that your speedo cable screws into on one side and the speed sensor screws in on the other side

Speedo cables and accessories

[mr j-man]

it's just a T-piece that your speedo cable screws into on one side and the speed sensor screws in on the other side

Speedo cables and accessories

cool! ive definately got that hooked up to me speedo cable....no stalls for me then!

[DANNY8]

Started on the wiring 2day and so far it seems maybe a bit too easy?? Maybe I've forgotten some stuff, but don't think so.

Clear plug - 1 wire coming from ignition, 1 wire check engine light. Leave the rest.
Grey plug - 1 wire oil psi sender (to gauge), 1 wire temp sender(to gauge). Leave the rest.
Black plug - 1 wire direct 12v via fuse, 1 wire fuel pump signal from ECU (goes to relay), 1 wire going to the output on a relay, which is 12v, switched by ignition. Leave the rest.

Apart from the charging wiring and starter wire, is this really all there is to the 5.0L injection system?? I'm not using a speed sensor either....will just see how it goes. Surely it's not as easy as those few wires??

Hopefully next week I can finish the smaller bits and get it started!

[DANNY8]

I just chucked a VN 5L 5spd into one of me VK wagons, and I can't get the ALDL connector to work. It seems the cable isn't getting no signal from the ALDL connector.

What I'm thinkin is the engine light might have to be hooked up to complete the circuit or sumfin, could this be the problem?

[delcowizzid]

yes you need the check engine light wired as its part of the aldl circuit.you can just tee in a test light into the data pin of the connector and clip its clip onto 12 volts

[DANNY8]

Thx mate, it bloody worked!

I checked the fault codes as well and it shows up with everything being fine...was hoping sumfin was dodgy coz the car has a miss. Sometimes it doesn't miss and is fine for a while, other times it does miss, but still seems to run well when ya give it some berries. Have changed the plugs, leads, rotor button and dizzy cap hoping that the problem was one of those but it's still doing it. And now no codes are showing up. Would a dodgy valve cause it ya rekon?

[Pub247]

if its intermintant i doubt itd be a dodgey valve. most likely something electrical

[DANNY8]

That's wat I first thought, but have replaced everything electrical so that's why I'm thinkin internal....I guess we'll work it out eventually. Might do a compression test to be sure, but that can wait a while, it goes alright at the moment except the miss lol.

Here's me new engine light, and also a switch which is joined into the wires behind the ALDL connector, and yeah ya switch it and it shorts it out to go into diagnostic mode. Gonna make an extension for the ALDL connector too and will mount it there.

Is there normally a humming sound under the bonnet when it's in diagnostic mode? I can hear it when I flick the switch, and it shows the error flashes ok, and doesn't stop humming till I turn the switch off.

[DANNY8]

Made the ALDL extension. Used the tail light plugs out of a series 1 VT, which match the ALDL plug.

[DANNY8]

Took the VK for a good run 2night. The ECU is showing up error code 44, which is "02 Lean(oxygen sensor)". What could be causing that? It's also throwing the speed sensor code but that's coz I haven't hooked it up yet. The voltage for the 02 sensor was averaging about .004 volts, until we disconnected it and it averaged about .450 volts (which then threw up error code 13 coz it was disconnected).

After it warms up it seems to have a pretty constant miss.