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#4658068 - 02/06/18 02:11 PM Check This Out... Make Sense?
NYEngineer Offline


Registered: 12/12/06
Posts: 1621
Loc: NY, NY
My stepson's 2008 Jeep Grand Cherokee had a CEL. I put the code reader on it and it was 480 or 481, can't remember. Anyway, It was Cooling Fan Circuit 2. I started looking around and realized the fan motor felt terrible. We pulled the fan and put 12 volts to it. I hardly turned so I then checked the 50 amp fuse that feeds it. It was blown. We replaced the fan and the fuse and tested it.
After the fan cycled on we still had a CEL. I also could not erase it. I gave it some thought and said ok, it's the high speed circuit. I put on the air conditioning and let it run a few minutes. The fan came on and ran faster. The CEL was still on. We shut the car off and went on to something else. A short time after, he started the car to move it and the CEL was out and has been out ever since.
My best guess is once I turned the air on and ran circuit 2 it satisfied the computer and cleared the CEL. Thoughts?

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#4658076 - 02/06/18 02:16 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
That or it just needed time/ a start/stop cycle to clear. I wonder why the fuse blew?
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)

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#4658079 - 02/06/18 02:18 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
NYEngineer Offline


Registered: 12/12/06
Posts: 1621
Loc: NY, NY
Because the fan motor was shot. When I jumped it to test it, it ran very slowly and squeaked and the wire got hot very quickly.
The new one is silky smooth.

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#4658099 - 02/06/18 02:46 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1351
Loc: toronto
Agreed with Hoosier, probably needed a few cycle instances or some time to be satisfied with the operation of the fan circuit. It'd make sense given the critical nature of an working cooling fan

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#4658109 - 02/06/18 02:56 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
Eddie Offline


Registered: 12/07/03
Posts: 9657
Loc: Florida, Cape Coral
If a few cycles doesn't clear the code then clear it manually. Ed
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#4658222 - 02/06/18 04:44 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
NYEngineer Offline


Registered: 12/12/06
Posts: 1621
Loc: NY, NY
I attempted to clear it once I replaced the fuse thus completing the circuit. Erase failed. It finally did clear itself after I operated the AC and the fan came on.

It's fine now. I was just trying to make sense of it.

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#4658280 - 02/06/18 05:49 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
Got it, glossed over the part that the motor was actually bad, I just thought the fuse was replaced and it was problem solved. My bad.

TPMS codes are like this too, at least on my Jeeps they have been, just have to let them clear on their own.
_________________________
15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
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96 Jeep XJ Country: STP HM 5W30 (winter)

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#4658499 - 02/06/18 09:44 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
Thax Offline


Registered: 11/07/10
Posts: 794
Loc: VA
Probably a two trip code, will take two trips to illuminate light. Two trips to clear light.
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#4658501 - 02/06/18 09:46 PM Re: Check This Out... Make Sense? [Re: NYEngineer]
dishdude Offline


Registered: 11/14/08
Posts: 8834
Loc: Phoenix
Or it's not a code controlled by OBD2 so a generic scan tool might not clear it.
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#4658668 - 02/07/18 05:00 AM Re: Check This Out... Make Sense? [Re: NYEngineer]
NYEngineer Offline


Registered: 12/12/06
Posts: 1621
Loc: NY, NY
Or there's that... Thanks for the replies.

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#4658799 - 02/07/18 08:16 AM Re: Check This Out... Make Sense? [Re: NYEngineer]
SHOZ Offline


Registered: 06/28/03
Posts: 5821
Loc: Illinois
If disconnecting the battery does not clear a code then you are left to the mercy of the ECU algorithms to clear itself.
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2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

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#4658976 - 02/07/18 11:27 AM Re: Check This Out... Make Sense? [Re: NYEngineer]
NYEngineer Offline


Registered: 12/12/06
Posts: 1621
Loc: NY, NY
I never disconnected the battery. I had tried clearing the code with my Innova.

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