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Unread 07-21-2009, 09:59 AM   #1
02grand
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2002 WJ 
 
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OBD II codes PO320 and PO455

Can someone let me know what these codes means and if there is a common way to fix. The 455 has been on for a while but the 320 came on after we went wheeling so not sure. Thanks

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Unread 07-21-2009, 10:04 AM   #2
timatoe
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P0320 = Ignition/Distributor Engine Speed Input Circuit Malfunction

P0455 = Evaporative Emission Control System Leak Detected (gross leak)

Not sure about the 320, but my Durango kicked the 455 code before with a bad fuel cap.
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Unread 07-21-2009, 10:28 AM   #3
rm2001wj
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P0320 = No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC)
= A CKP signal has not been detected at the PCM

That means that the crankshaft position sensor needs to be replaced. There's an outside chance that something happened to the wiring harness connector at the sensor while you were wheeling, so check that first.
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Unread 07-22-2009, 01:15 PM   #4
02grand
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The cap was just relaced aboutthre mnths ago becaus eit failed emissions. Could maybe a air line to tank got cracked? Thanks for your help. Ill check that harness and sensor this weekend.
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Unread 07-22-2009, 01:31 PM   #5
02grand
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Hey guys another question quick. The aprt number is saying it fits from 97 to 04. Is that true. I thought maybe i try one from junkyard to make sure it is problem before i buy new one and it might be broken wire. Thanks
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Unread 07-22-2009, 01:45 PM   #6
WiCkeDuDe
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Is this on a WJ? EVAP leaks are common. Its usually the gas cap, leak detection pump, or one of the vacuum lines split.
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Unread 07-22-2009, 01:54 PM   #7
02grand
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yes wj. I thought maybe one of the lines were split so ill check those and let you guys know what happens. Thanks
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Unread 09-30-2009, 01:45 PM   #8
Redrider39
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The P0455 is a vacuum leak for sure. I've got 2 liberties and have replaced every vacuum line in both from front to back. Jam full of cracked hoses. (Canister hoses that is.) I have just had my first encounter with the P0320 code. I have a crankshaft position sensor ordered and should have it in by tommorow. Will coment afterwards.
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Unread 09-30-2009, 01:46 PM   #9
02grand
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Did replacing hoses work? Where did you get hoses from. Thanks
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Unread 09-30-2009, 07:05 PM   #10
Redrider39
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Yes, replacing the hoses worked great. Sorry I didn't complete my statement before. Just get some 3/8 and 5/16 stock hose from your auto supply. I actually used transmission hose. It is reinforced and a lot thicker. Never saw the P0455 code again.
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Unread 10-01-2009, 11:54 AM   #11
Redrider39
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Just to let y'all know, I repaired the OBDII code: P0320 problem with a crankshaft position sensor. The bluejeep is back on the road.
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Unread 10-01-2009, 12:44 PM   #12
Redrider39
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I'm new to the forum so don't laugh toooooooo hard but what is the difference in a KJ and KK Liberty?? I know, ha ha ha.
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