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Check This Out... Make Sense? #4658068
02/06/18 02:11 PM
02/06/18 02:11 PM
Joined: Dec 2006
Posts: 1,808
NY, NY
NYEngineer Offline OP
NYEngineer  Offline OP
Joined: Dec 2006
Posts: 1,808
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?

Re: Check This Out... Make Sense? [Re: NYEngineer] #4658076
02/06/18 02:16 PM
02/06/18 02:16 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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)
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658079
02/06/18 02:18 PM
02/06/18 02:18 PM
Joined: Dec 2006
Posts: 1,808
NY, NY
NYEngineer Offline OP
NYEngineer  Offline OP
Joined: Dec 2006
Posts: 1,808
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.

Re: Check This Out... Make Sense? [Re: NYEngineer] #4658099
02/06/18 02:46 PM
02/06/18 02:46 PM
Joined: Mar 2016
Posts: 1,674
Toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,674
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


There's no replacement...'scosity for natural viscosity
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658109
02/06/18 02:56 PM
02/06/18 02:56 PM
Joined: Dec 2003
Posts: 9,975
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,975
Florida, Cape Coral
If a few cycles doesn't clear the code then clear it manually. Ed


CX5 Touring 2.5L :-)
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658222
02/06/18 04:44 PM
02/06/18 04:44 PM
Joined: Dec 2006
Posts: 1,808
NY, NY
NYEngineer Offline OP
NYEngineer  Offline OP
Joined: Dec 2006
Posts: 1,808
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.

Re: Check This Out... Make Sense? [Re: NYEngineer] #4658280
02/06/18 05:49 PM
02/06/18 05:49 PM
Joined: Nov 2016
Posts: 1,283
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,283
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
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658499
02/06/18 09:44 PM
02/06/18 09:44 PM
Joined: Nov 2010
Posts: 814
VA
Thax Offline
Thax  Offline
Joined: Nov 2010
Posts: 814
VA
Probably a two trip code, will take two trips to illuminate light. Two trips to clear light.


2000 Ford Explorer Limited 5.0L AWD
2018 KIA Soul EX 2.0L
ASE P2 Parts Specialist
AIA Import Part Specialist
KIA certified Senior Technician, Hybrid certified.
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658501
02/06/18 09:46 PM
02/06/18 09:46 PM
Joined: Nov 2008
Posts: 9,406
Phoenix
dishdude Offline
dishdude  Offline
Joined: Nov 2008
Posts: 9,406
Phoenix
Or it's not a code controlled by OBD2 so a generic scan tool might not clear it.


2018 Challenger SRT 392 PUP 0w-40 Wix 57899XP
2018 GTI
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658668
02/07/18 05:00 AM
02/07/18 05:00 AM
Joined: Dec 2006
Posts: 1,808
NY, NY
NYEngineer Offline OP
NYEngineer  Offline OP
Joined: Dec 2006
Posts: 1,808
NY, NY
Or there's that... Thanks for the replies.

Re: Check This Out... Make Sense? [Re: NYEngineer] #4658799
02/07/18 08:16 AM
02/07/18 08:16 AM
Joined: Jun 2003
Posts: 5,973
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,973
Illinois
If disconnecting the battery does not clear a code then you are left to the mercy of the ECU algorithms to clear itself.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual
Re: Check This Out... Make Sense? [Re: NYEngineer] #4658976
02/07/18 11:27 AM
02/07/18 11:27 AM
Joined: Dec 2006
Posts: 1,808
NY, NY
NYEngineer Offline OP
NYEngineer  Offline OP
Joined: Dec 2006
Posts: 1,808
NY, NY
I never disconnected the battery. I had tried clearing the code with my Innova.


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