LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Blowing Fan Fuse (#6)

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Old Aug 3, 2004 | 09:40 PM
  #1  
Kataklysm's Avatar
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Blowing Fan Fuse (#6)

Well for some reason the car keeps blowing fuse 6 so the fans won't come on. I have changed some things and scanned multiple times. The two things that made most sense were code 77 (fan cirucit relay) and code 26 (evap control solenoid circuit.) Both these run off the #6 fuse. I replaced all 3 fan relays and the EVAP purge solenoid but still have had no luck, as a matter of fact its still reading code 26 for some reason...it is a brand new AC Delco EVAP solenoid. Now what am I supposed to do? I'm guessing theres a short in a wire someplace?
Old Aug 3, 2004 | 09:45 PM
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Re: Blowing Fan Fuse (#6)

have u checked the wires? connections?
Old Aug 3, 2004 | 10:28 PM
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Re: Blowing Fan Fuse (#6)

Does it blow immediately when they key is turned on?
Old Aug 4, 2004 | 06:34 AM
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Re: Blowing Fan Fuse (#6)

I can let the car idle and it will not blow, it only happens when I drive it. I watched the scanner while I was driving, fan control 1 relay turned on fine but as soon as fan control 2 turned on the fuse went out. It happens with the a/c on and with the a/c off. Once again it is fine at idle though, fans cycled about 6 times before I decided to drive it to see what happened.
Old Aug 4, 2004 | 11:02 AM
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Re: Blowing Fan Fuse (#6)

TO RULE OUT THE PURGE SOLENOID:

Can you watch the canister purge duty cycle on your scanner? It will show CCP or EEC or something like that. If you can watch it, does the fuse blow as soon as the canister purge duty cycle become "not-zero"? That would indicate the solenoid is the problem.

TO CHECK THE #2 FAN:

If you can correlate the problem to the activation of fan #2 (isn't it a bit more complex than that? Doesn't it involve relays 2 & 3 and multiple speeds on the fan?).... then that points you to the wiring. Check the +12V source to the #2 relay and see if it is grounded somehow when the ground signal from the PCM is trying to pull in the relay.

At the instant the fan blows the fuse, if the PCM is calling for EEC purge, its going to notice the solenoid stopped working and set the code 27. IOW, it isn't setting the code because the EEC purge solenoid is faulty, its setting the code because it was trying to operater the solenoid but the solenoid didn't work because it had no power - the #2 fan caused the problem.
Old Aug 4, 2004 | 11:49 AM
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From: conshohocken
Re: Blowing Fan Fuse (#6)

bud,i had the same problem.your fans are not faulty neither is your evap canister.when i burned up my pass side o2 harness i crossed two wires:threw the same code,kept blowing out fan fuses.i think it was the brown wire that runs those two.i can bet thats your problem.
Old Aug 4, 2004 | 06:26 PM
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Re: Blowing Fan Fuse (#6)

Originally Posted by Injuneer
TO RULE OUT THE PURGE SOLENOID:

Can you watch the canister purge duty cycle on your scanner? It will show CCP or EEC or something like that. If you can watch it, does the fuse blow as soon as the canister purge duty cycle become "not-zero"? That would indicate the solenoid is the problem.

TO CHECK THE #2 FAN:

If you can correlate the problem to the activation of fan #2 (isn't it a bit more complex than that? Doesn't it involve relays 2 & 3 and multiple speeds on the fan?).... then that points you to the wiring. Check the +12V source to the #2 relay and see if it is grounded somehow when the ground signal from the PCM is trying to pull in the relay.

At the instant the fan blows the fuse, if the PCM is calling for EEC purge, its going to notice the solenoid stopped working and set the code 27. IOW, it isn't setting the code because the EEC purge solenoid is faulty, its setting the code because it was trying to operater the solenoid but the solenoid didn't work because it had no power - the #2 fan caused the problem.
I'll look into that. Also when the fuse blows its sets off 27 which is the EGR circuit so whatever is blowing out the fuse is causing the EVAP and EGR to have no power. This is really starting to get annoying now.
Old Aug 5, 2004 | 12:13 AM
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Re: Blowing Fan Fuse (#6)

the evap and fans are run on the same brown wire.you def have a short somewhere.my situation was fan #1 code,fans wouldnt come on at all and i threw a evap canister code.when i rewired the o2 sensor and got the brown wire matching right the codes went away,fans come on now.
Old Aug 5, 2004 | 06:33 AM
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Re: Blowing Fan Fuse (#6)

TTT before work
Old Aug 5, 2004 | 09:40 AM
  #10  
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Re: Blowing Fan Fuse (#6)

I think I answered this on another post for you, but in case I didn't here it is again:

There are multiple devices drive off fuse #6. You have to go to Shoebox's website, look at his wiring diagrams, which are for 1995 models, and identify ALL devices running off fuse #6. Then you need to methodically check each device, and the wiring to each device. It is tedious, but that's the only way to solve the problem. Repeating the posts and "TTT"-ing things is not the way YOU have to solve the problem.
Old Aug 5, 2004 | 05:36 PM
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Re: Blowing Fan Fuse (#6)

I realize that but I was curious if someone else had the same problem that wasn't a wire. I know its definitly a short someplace now since I went through everything.
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