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Old 03-25-2015, 02:27 PM
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P0205 code

My 2000 Cherokee sport is throwing a p0205 code....this in itself I know isn't really a hard fix but I am concerned that the engine is also making a rattling sound...almost sounds like a Diesel engine. I am hoping that just fixing the fuel injector will resolve the issue, but is there a chance that this is a separate problem?

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Old 03-25-2015, 02:39 PM
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Re: P0205 code

Welcome to the garage.
Due to the number 5 injector not working, the engine will run rough, so most probably by solving the injector issue, the rough, diesel like run will, be solved.
This can be the injector itself, but also wiring (open or shorted) or the PCM.
You can measure the resistance of the injector first. I expect it to be around the 12-14 ohms, but you can compare it with the others to have a good average.
If ok, then you will have to measure the wiring. I donīt have a wiring schematic for your jeep, but you can measure 12V on one side, when the ignition is in run. This 12V will only be there while the auto shutdown relay is energized. When you donīt start the engine, this will only be for a few seconds a time, so you will need a helper for this. If 12V is ok, then measure the wire which goes to the PCM. It should have continuity, but not to ground (shorted). If this all is ok, then the PCM seems to be the problem.
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Old 03-25-2015, 03:11 PM
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Re: P0205 code

So, I went out and put the reader on the Jeep again and, thank goodness, there are no new error codes. It says that the injector circuit is open on cylinder 5. My intuition is telling me that there is probably a short and that the pcm is not the problem.
When I started it just now it is still running rough, of course, but that "diesel" sounds is not there; probably cuz it is cold. Fingers crossed.
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Old 03-25-2015, 06:54 PM
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Re: P0205 code

Since it says that there is an open cirquit, that means that it can not be a short. A short is when a wire is making contact to ground or an other wire. In this case there is an open cirquit, so that means or a broken wire, or an injector with a very high resistance. I would start measuring the injector resistance.
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