wiring injectors, efi relay, fuel pump vsv

[YLD-16L]

Oh, that is handy

So there is one wire out of the ECU for combined sensor ground, and another one (or more) for power grounds? Nice.

Yah, 5 ground wires from the ECU to ground it.

A few to ground the sensors, I think I had to add one or two in order to have all the sensors grounded internally via the ECU.

The Adaptronic manual states not to use the TPS ground as a common ground for any other sensors either while I remember.

[chris davey]

ps: fuck I hate wiring. fucking nerdy fags with their resistance and ohms. i just want to do skids.... does anyone want pizza/beer/cash to swing by my place and wire it up for me? i can look over your shoulder and/or get in your way if you like

haha

I am the same! I am just finalising my microtech install.

Bloody issue I have is fitting the glovebox back in! So many extra wires.

Will redo my injector wiring with a relay after reading this thread though.

[timbosaurus]

ps: fuck I hate wiring. fucking nerdy fags with their resistance and ohms.

I love rewiring... what are you saying

[Shifty]

Oh man I hate it, i really do. I'm crap at soldering and I'm crap at remembering to put heatshrink on BEFORE I solder stuff and I'm crap at anythign that involves an ounce of patience...

[hks7mgt]

c) Battery -> fuse -> relay (ignition switched) -> injectors -> earthed by ECU when required

I've never heard of using relay's in the injector circuits. Isn't that what the main power feed into the ECU is for??? And yes, relays for the Fuel pump and Thermo Fan(s) and other switchable aux, but injectors...

Why would you install four relay's, one for each injector output? Wouldn't the relay delay the signal to some extent as well?

Maybe i'm miss reading this...

[timbosaurus]

No, ECU's generally don't provide power to the injectors.

An ignition controlled relay feeds 12V to one side, and the ECU grounds the other as required.

[timbosaurus]

Oh, and you only need one fuse and relay for all injectors.

[Shifty]

Agree that one relay & fuse for all four injectors would be the way to go, at least if something goes wrong you lose them all not just drop a single injector.

Other thing I need to know about is what appears to be the coil-on-plug setup.

Four wires from each one...

[hks7mgt]

Yes, you are completely correct!

For some reason i was under the impression there were two wires for each injector coming from the ECU. I don't know what come over me there.

Please feel free to delete my posts as this will only confuse other readers.

[timbosaurus]

Shifty, I'm not all THAT familiar with the 3S's, and I didn't realise that the 3SGTE's had COP. I knew the Beams did, but maybe i'm mistaken.

The 4-wire COP connectors are not just coils, they are coils with built in ignitors.

IIRC the pins are:

12V
IGT
ION/IGF
GND

12V will come from a fuse/relay like the injectors, and GND will go to a clean earth point.

IGT is from the ECU and is the Ignition timing pulse, and ION/IGF can be left open, as it is the feedback for a factory ECU

[Shifty]

Mine is very late; Caldina ST215... I think they're about a 99 model?

Early ones definitely not COP.

[Shifty]

Pic for your reference. Sorry it's not great but it's just a general engine bay shot I already had from a while back. Should still be able to see COP setup.

[stidnam]

This may be of use to you

[YLD-16L]

Oh man I hate it, i really do. I'm crap at soldering and I'm crap at remembering to put heatshrink on BEFORE I solder stuff and I'm crap at anythign that involves an ounce of patience...

Crimp rather than solder unless you have to solder.

[wagonist]

Shifty, I'm not all THAT familiar with the 3S's, and I didn't realise that the 3SGTE's had COP. I knew the Beams did, but maybe i'm mistaken.

ST215 (Gen IV) onwards 3S-GTE is COP.

My standard setup has a big resistor built into the injector circuit, do aftermarket ECU's need this too?