injector harness question

[1dollardog]

On a hot air injector harness you have 2 plugs. One with 3 prongs and another with 4 prongs. Since there are 6 injectors and 7 total prongs I assume one is the ground. Right? Which colored wire is the ground wire in this harness?

 

[mikestertwo]

On a hot air injector harness you have 2 plugs. One with 3 prongs and another with 4 prongs. Since there are 6 injectors and 7 total prongs I assume one is the ground. Right? Which colored wire is the ground wire in this harness?

I'm not sure about the hot air harness but I would think it's the other way around. You should have 1 hot wire and then 6 wires going back to the ECM. The ECM would supply the ground for each injector.

 

[1dollardog]

I'm not sure about the hot air harness but I would think it's the other way around. You should have 1 hot wire and then 6 wires going back to the ECM. The ECM would supply the ground for each injector.

I'm not sure. Seems with each injector fireing at a different time, you would need to have a hot wire for each one so it could fire individually at its right time. You could be right I just don't know anything about it.

 

[Chuck Leeper]

Nope!

I'm not sure. Seems with each injector fireing at a different time, you would need to have a hot wire for each one so it could fire individually at its right time. You could be right I just don't know anything about it.

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There is a common, 12vdc supply to all 6 injs. The ECM takes each inj to ground, when it's sequence in the firing order comes up.

 

[1dollardog]

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There is a common, 12vdc supply to all 6 injs. The ECM takes each inj to ground, when it's sequence in the firing order comes up.

So you have 1 hot wire that is common to all 6 injectors and each injector is grounded through the ecm individually when its "time to fire" comes up. Is it obvious which is the common hot wire? What color is it?