what is the best way to test for a shorted injector wiring harness. Would like to know if there is a quick way to test the injector harness, Engine is flooding , dumping lots of fuel and it's gets in the crankcase.

 

Disconnect at the ecu and using a continuity tester and the circuit diagram test for shorts between each pin and every other pin of the ecu connector. And maybe between each pin and ground also. That's what I would do anyway.

 

Don't suppose you have a spare injector lying around?
I attached it to each connector one at a time and felt it for pulsing rather than holding.
Im having similar probs to you, see your other thread.

 

your injectors fire in banks of three, so you will see a 'short' in continuity across those, so i suggest a wiring diagram first,

all injectors are permanently live and fire with a signal through the power module to ground through the ECU ,

quite complex at first

BB

 

since the injectors always have voltage and are pulsed with ecm provided ground, there must? be a short to ground on the ground side, to hold the injectors wide open, and since there are 3 sets that pulse individually where is there a common ground wire the could be shorted to ground?

 

If this is what you believe is happening (cooked efi loom) you may just want to get in there and start pulling back some tape. if your loom is still in the bottom of the Vee, you might go ahead and get ready to take it out of there. Getting ready for a rebuild. I think ya gotta just pull it out.

From there you'll see 4 different wire colors which I believe all have 12v. The remaining will be your ground... Again, I think. Proceed with caution. But just do it

The KB wires I think are ground triggers, where K is PINK?
You'll have to look up jaguar wire color key.

EDIT: I'm sorry, I believe the KB wires are the positives while the O and xxxx are the negatives thru the resistor pack... My bad...

EDIT X2: Sorry, I think they are ALL positive as fed by KB and grounded (like was said) in the ECU itself?

I have a LOT to learn...

Someone help me out here, lol

 

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this is the injector wiring to the power module , see how each injector is connected to two others on the same bank,

so 4 firing circuits controlling 3 injectors on each circuit , shared feed and return ( not grounds as the ECU does that with electronics )




BB

 

THAT^^^^

Thanks BB... I had it kinda sideways.

 

I had a similar problem a while ago, ran really rich to the point of stalling and wouldn't rev due to too much fuel, and it turned out to be the coolant temp sensor open circuit, cleaned connector and all came good.