1J injector power

[rogue-vl]

Just hoping someone could confirm that the injectors in a JZZ30 1J (not that i think its different to any other 1J) do NOT get power whilst cranking. I did a test on the circuit with the JZZ30 loom and ignition switch which showed this.

[Mos]

Can you think of any reason why injectors (which allow fuel to go into an engine) would need to be turned off while cranking? How would the engine actually start? (and don't say cold start injector)

How did you do the test? What do you mean by loom and ignition switch? (ie how much of the loom - entire front cut? portions only? whole car?) Do they get power when you're not cranking? Are you measuring voltage or test light?

It sounds like either your loom is screwy (possibly feeding injector power from the accessory output of the ignition switch rather than IG2) or you're doing something wrong.

Mos.

[rogue-vl]

I have the entire loom from front cut, used a test light, power while ignition was turned on, no power when turned to start/crank the engine.
I thought that it was a bit strange thats why i come here seeking clarinfication.
Injector should have power constantly with ignition on and during cranking then?

[wilbo666]

As said.

Engine needs fuel to start, fuel means injector, injectors means power.....(1jz doesn't have a CSI anyway it increases the duty cycle on all the injectors).

Injectors are meant to be powered via the IGN circuit (I suggest a relay).

If you have a JZZ30 loom there is an almost square plug on the inside loom that contains the injector power. There are two separate pins for the injector power (two injector power circuits), one wire / pin is larger than the other as well.

You can find the wires you require by removing an injector plug and using a multimeter to trace back to the connect I have spoken of.

*edit: perhaps you have a relay setup that is triggered off ign but not crank as well....if so fix that

Cheers
Wilbo

[triptek]

As wilbo said there in the large square plug. There black/orange real fat wire's though. If i'm not mistaken these are the power for the coils aswell, according to the soarer wiring diagram they are.

[rogue-vl]

Thanks guys , I had already figured out the wiring, as Wilbo guessed , I was planning on triggering the relay that is triggered off ign but not crank as well.
Thanks for clearing nthat up, I imagine it would have take some time to fault find that starting problem.