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Code PO304

Tiny
WILLYS60
  • MEMBER
  • 2005 CHRYSLER PT CRUISER
  • AUTOMATIC
  • 98,000 MILES
Okay, I don't have much hair left trying to figure this out out. I have the car listed above GT model turbo. Has a code po304. Has no ground pulse on # 4 injector. Has good positive power at the side of injector. Has good flash at other injector I have sent the PCM back to a repair shop twice. They said both times the number 4 driver was good, but the second time they said they replaced the driver as a courtesy. Still no noid light pulse on 4 I have even went and cut the 4 wire. At PCM and put a wire to the negative side. Still the. Same. Then even got a very very thin wire. Put it over the PCM term that is the # 4 negative driver. Still no pulse any any ideas?
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Sunday, April 28th, 2019 AT 1:54 PM

16 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Did you disconnect the PCM and verify power to that wire to be sure there is signal from the injector?

Roy
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Sunday, April 28th, 2019 AT 2:15 PM
Tiny
WILLYS60
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Hi Roy, yes, it has. 12 volts power to the #4 injector positive side. No negative pulse.
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Sunday, April 28th, 2019 AT 3:47 PM
Tiny
ASEMASTER6371
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Okay, I saw the positive side of the injector.

The negative goes to the PCM. Is that battery voltage at the PCM?

Roy
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Sunday, April 28th, 2019 AT 3:57 PM
Tiny
WILLYS60
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I can tell you if I put a led test light on the negative. At any negative side of injector wire I get a dim. Light. Aligned clip to positive side of battery. If I unplug the orange and black at PCM the lights goes away can also put the same led test light on eg. # 3 negative. It flashes away. Nothing on # 4 thanks for your time.
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Sunday, April 28th, 2019 AT 4:23 PM
Tiny
WILLYS60
  • MEMBER
  • 10 POSTS
Any idea what turns? The injector negative side on and off. I have also changed out the cam sensor and magnet I just can't under stand why the negative side wont flash the noid light has. Good positive power while cranking I have had it running. When I first got it. I called the last place that looked at a Dodge dealer. They said. They. Put in new wires. Plugs same issue customer decided to donate. Car. It had a new # 4 injector in it also so some one was catching the problem for a while. It has got me stumped.
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Sunday, April 28th, 2019 AT 4:42 PM
Tiny
ASEMASTER6371
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The driver in the pcmr controls the ground.

The dim light concerns me. That sounds like the injector itself is the failure.

Roy
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Sunday, April 28th, 2019 AT 4:47 PM
Tiny
WILLYS60
  • MEMBER
  • 10 POSTS
No the pig tail on # 3 and # 4. Is not connected to the injector. Just a noid light. Flashes great on any but #4.
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Sunday, April 28th, 2019 AT 4:51 PM
Tiny
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Where is the dim light?

Roy
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Sunday, April 28th, 2019 AT 4:53 PM
Tiny
WILLYS60
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With a LED light aligned clip to positive side of battery. They pointed end of test light to neg side of fj pig tail the light is dim with ignition off or on at #3 or 4 etc. Can a coil cause a driver to stop pulsing? Or what can?
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Sunday, April 28th, 2019 AT 5:04 PM
Tiny
WILLYS60
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Hi, I am sorry. But its code po204. I guessing too old.
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Sunday, April 28th, 2019 AT 5:09 PM
Tiny
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Again the injector.

Roy
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Sunday, April 28th, 2019 AT 5:25 PM
Tiny
WILLYS60
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One more thing and I will leave you alone. Would it be a true statement that if # 3 injector flashes. A noid light Shouldn't # 4 do the same?
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Sunday, April 28th, 2019 AT 5:31 PM
Tiny
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Yes it should.

Roy
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Sunday, April 28th, 2019 AT 5:35 PM
Tiny
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A little of a update. I put the intake back on the engine. Fired it up started right. Still misfiring on #4. I have got the neg side of the injector wire at # 4 cut. And if I put a wire to negative side of battery and put a. Quick spark to the negative side of injector. The car. Does run as it should until gas goes away. Any other ideas on What is going on with it? So I am wondering if the comp. Test bench tester that it was on didn't pickup the problem or? Any idea. What really tell the PCM to fire the injectors? Thank you
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Monday, April 29th, 2019 AT 5:22 PM
Tiny
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PCM test bench.
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Monday, April 29th, 2019 AT 5:23 PM
Tiny
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Very possible as the quad driver controls the firing of the injector.

Roy
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Tuesday, April 30th, 2019 AT 2:17 AM

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