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Unread 04-21-2008, 05:53 PM   #1
ProjectXJ00
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Join Date: Apr 2008
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P0204

Hey guys

Over the past months I've had a reoccurring problem with my 2000 XJ. About a month ago I got a check engine light. My brother is a VW/Subaru nut so hes got a code reader. He scanned my car...P0204 and P0304 come up. The exhaust reeked like fuel and he said that for some reason the Cyl. 4 injector was dumping too much fuel and therefore causing Cyl. 4 to also missfire, this also explained the fuel smell in the exhaust.

I took the car to the dealer to have them change out the injector. They fixed the problem and it didn't come back. Just yesterday, a month after it was fixed, I was driving home and a CEL popped up. I got home, scanned it, and it was P0204, the same problem.

Any idea what the problem is?

Thanks in advance.

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Unread 04-21-2008, 05:58 PM   #2
Smittie
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1998 XJ Cherokee 
 
Join Date: Oct 2007
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Posts: 105
P0204 (M) Injector #4 Control Circuit
Injector #4 or INJ 4 injector bank output driver stage does not respond properly to the control signal.

Not much of a contribution but...

Smittie
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Unread 04-21-2008, 06:05 PM   #3
01sherman
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2001 XJ Cherokee 
 
Join Date: Apr 2008
Location: south jersey
Posts: 78
i was having the same problem but with #6 i replaced the inj but never the coil and now i have codes p0700 and it doesnt misfire but i cant also clear the code i have a post up on it
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Unread 04-21-2008, 10:23 PM   #4
ProjectXJ00
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thanks for the responses, anyone else?
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Unread 04-22-2008, 10:18 AM   #5
ProjectXJ00
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up to the top
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Unread 04-22-2008, 11:04 AM   #6
dvlscoupe
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Use the scan tool to moniter the injecter pulse for that one (if you can with that scan tool) or use a meter or test light to watch the voltage. It may be shorting in the harness or getting a signal from the modul to stay open to long. It could also be getting to much voltage and getting stuck on. If it keeps happening to much fuel can wash out the cylinder, and break down oil and cause havoc on the bottom end.
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Unread 04-22-2008, 11:06 AM   #7
dvlscoupe
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Another easy way to jus check that injecter is swap it's position with a known good one on the cylinder and see if it's still effecting cyl# 4 or if it transfers to the cylinder you moved it to. Then you'll know it's an injector and not a harness/computer issue.
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Unread 04-22-2008, 04:57 PM   #8
ProjectXJ00
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Quote:
Originally Posted by dvlscoupe View Post
Another easy way to jus check that injecter is swap it's position with a known good one on the cylinder and see if it's still effecting cyl# 4 or if it transfers to the cylinder you moved it to. Then you'll know it's an injector and not a harness/computer issue.

Very good call, thanks so much for the information.
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Unread 06-24-2012, 10:15 PM   #9
Vici0usX
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Revive! So I did the above mentioned and the problem persists, so this would indicate a problem with the wiring or computer? Best way to test?
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