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The easiest way to test if the wires to #6 are sending the signal to the injector is to get a noid light and plug it into the harness at the injector providing there is room to access the injector from the injector.
Often times, the positive voltage feeds all the injectors, while the PCM applies ground to each individual injector.
You will need to test continuity from the #6 injector to the PCM with an Ohm test providing you have 12 volts at the injector. The ground opens and shuts once with each intake cycle to provide a fuel charge, so it will blink rapidly. That is normal. If the noid light does not come on but you confirmed 12 volts positive, but no ground then you have an open between the injector and the PCM. If the noid light comes on but does not flash or flicker, then there's either a short to ground in the wire from the injector to the PCM, or a faulty driver within the PCM itself causing an internal short.
What kind of test light did you use? A noid? Is it the injector that's not working, or the computer that sends the signal? Are you getting battery power to one of the injector terminals when the key is on?
It could be a short in the injector circuit (and it's not that complicated), or it could be a shorted injector itself. You may be able to isolate and find it.
Begin by disconnecting all six injector connectors from the injectors. Now put a new fuse into the injector fuse slot and turn the key to on, not start. If the fuse blows again, there must be a short in the circuit-I'll get to that later. If the fuse stays good, then put one injector connector back on -key still on. Watch for the fuse to blow when you connect each individual injector back on. If you have a shorted injector (internally bad), it can blow the fuse and stop the injector power circuit. That injector must be replaced. The injectors can also be checked with a volt ohm meter, if you have one.
So if your circuit is bad, from fuse to the injector harness connector a pink/black wire supplies constant battery voltage to all injectors-always hot in run or start-each injector gets a splice from this pink/black wire. The other wire at each injector is the dark blue ground wire. From each side of the engine the ground wires splice together-so 3 to each side-and head into the ecm on the 22 pin blue ecm connector. The pin numbers are D3 and D9. When the computer internally grounds one side or the other for a split second, that is where you get the pulse-the injector solenoid is energized, opening the injector for fuel to spray out. So now you know where all the injector circuit is, and where to look for a short. Having a DVOM would help you immensely in troubleshooting any thing automotive. Good luck, let me know what you find.
Cauases or fault codes are not cut and dry, but here are the possible causes of codes P0316 and P0306 which are related codes.
P0316 - Engine Misfire Detected on Startup
- Engine Light ON (or Service Engine Soon Warning Light) - Engine fails to start - Engine runs rough
- Crankshaft Position (CKP) sensor harness is open or shorted - Crankshaft Position (CKP) sensor circuit poor electrical connection - Faulty Crankshaft Position (CKP) - Ignition System - Fuel Injectors - Running out of fuel - Fuel Quality - Faulty Engine Control Module (ECM)
P0306 - Cylinder 6 Misfire Detected
- Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation
- Faulty spark plug 6 - Faulty ignition coil 6 - Ignition coil 6 harness is open or shorted - Ignition coil 6 poor electrical connection - Clogged or faulty fuel injector 6 - Injector 6 harness is open or shorted - Injector 6 poor electrical connection - Improper spark plug 6 - Insufficient cylinder 6 compression - Incorrect fuel pressure - Intake air leak
When a misfire occurs, engine speed will fluctuate. If the engine speed
fluctuates enough to cause the Crankshaft Position (CKP) sensor signal
to vary, The Powertrain Control Module (PCM) or Electronic Control
Module (ECM) can determine that a misfire is occurring.
When is the code detected?
- Engine Cylinder #5 and #6 is Misfiring.
Symptoms: - Engine Light ON (or Service Engine Soon Warning Light) - Lack/loss of power - Hard start - Engine hesitation
Possible Causes: - Improper spark plug at cylinder #5 and #6 - Insufficient compression at cylinder #5 and #6 - Incorrect fuel pressure - The injector circuit is open or shorted at cylinder #5 and #6 - Fuel injector #5 and #6 may be faulty - Intake air leak at cyli
Possible Solution: - Perform Injector Service - Replaced Spark Plug #5 and #6 - Replaced Injector #5 and #6 - Replaced Ignition Coil #5 and #6
Unplug the battery cable. Pull out connectors to the injectors, one at a time and measure the impedance on the injector with a digital multimeter. The reading should not be higher than around 10-12 ohms. If you get a really high reading or indication of open circuit then the injector is burn out. If you get really low reading like 1 ohm vice versa, then injector is shorted out. If you found the burnt injector, and replaced it with a good one the car will run a lot smoother since all cylinders are operating.
sounds like a short in the wiring from the fuse and the fuel injector junction block. GM like most fuel injection systems control injector firing by the computer providing ground to each injector in pairs or individually. The fuel injector fuse provides power to the injectors using splices therefore enabling one wire to feed 6 injectors. A shorted wire at any of these wires will blow the fuse. On one rare incident I found a faulty computer caused the fuse to blow. A shorted injector will just cause a rough running problem due to the injector stuck either open or closed.