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Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's. |
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#31
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Re: Radiator Fan Override Switch (The Easy Way)
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![]() I've got a 97/98 update ..... My over-ride for the e-fan is no more than a splice into the blue/pink wire at the PDC ... and a switch that grounds the spliced wire. No relays / diodes or anything else ... and it works a treat if I ever need to turn it on. Theres a writeup on jeepforum that confirms it ... altho many have the CEL as you mention - depending on year models. |
#32
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Re: Radiator Fan Override Switch (The Easy Way)
Interesting. My 98 fsm tells me the ECU will trigger a CEL. Another strange bit of info - looking at my fsm wiring diagrams, my wiring harness matches that of a 2.5L. I have a 4.0. This only pertains to the fan wiring, I haven't checked for any other differences.
__________________
My yard looks like Sanford & Sons. Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread. Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want. CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable. |
#33
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Re: Radiator Fan Override Switch (The Easy Way)
Since Im not a wiring expert .... I was wondering wehether MY splice at the relay terminal ... rather than a splice point closer to the PCM may have averted the CEL .... but I wouldnt think so. ????
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#34
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Re: Radiator Fan Override Switch (The Easy Way)
I tried the simple grounding of the wire, and it threw a code. I used a relay (NO/NC) to open the PCM side and ground the relay side, to prevent that, but it would still throw a code when the PCM wanted to run the fan. I gave up as the cold weather arrived. I've read numerous posts on other forums where guys said this mod (the simple grounding of the wire, not fyrfytr's variation) didn't throw a code on 97+ Jeeps, but that wasn't my experience.
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#35
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Re: Radiator Fan Override Switch (The Easy Way)
well i did mine and it flat out didnt work
![]() this is the fan wire (100% sure its dark blue with pink tracer) here is the ST-RUN power its dark blue with white strip once again 100% sure of it and heres my jeep ![]() i just tryed wiring it 2 my fuse block and it worked!!! so i may just keep it like that......... EDIT: pics dont work > ![]() |
#36
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Re: Radiator Fan Override Switch (The Easy Way)
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#37
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Re: Radiator Fan Override Switch (The Easy Way)
So it doesn't throw a code when you have the fan forced on, and the AC on? I just assumed (don't know why I never bothered to check) that it watched the voltage/grounds of the entire fan circuit, not just the wiring between the PDC and PCM. I need to tear into the dash again soon- I might just try that.
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#38
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Re: Radiator Fan Override Switch (The Easy Way)
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#39
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Re: Radiator Fan Override Switch (The Easy Way)
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__________________
My yard looks like Sanford & Sons. Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread. Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want. CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable. |
#40
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Re: Radiator Fan Override Switch (The Easy Way)
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I was just using that explanation as an example... This idea of grounding out an ECU terminal is the wrong approach to manually turn the fan on.... The research (almost 7 years ago) I referenced in an earlier post showed this to be a mistake that could harm the ECU... |
#41
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Re: Radiator Fan Override Switch (The Easy Way)
(apologies to fyrfytr for cluttering up the thread)
Okay, poking around with the meter, doing some googling. The light blue wire isn't ground, it's power. Ground is black, and unswitched. The relay in the PDC, when energized, puts 12V on the blue wire, fan runs. Taking an educated guess here, but is this how you actually wired it up, Charles? (and sure enough, the PCM doesn't monitor the fan, just the control ckt) ![]() Switch off, stock power wire connected to 87a (NC) contact, wire from fan connected to 30, fan runs only when PDC energizes. Switch on, battery power on 87, fan on 30, stock power wire held open, fan runs constantly. Have I got it right? Last edited by hubs97xj; July 12th, 2010 at 13:55. |
#42
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Re: Radiator Fan Override Switch (The Easy Way)
^ that helps!! if it works....
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#43
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Re: Radiator Fan Override Switch (The Easy Way)
That should work. The blue +12V line should be from an ignition-switched source unless you want to be able to leave your fan on when the jeep is not running.
__________________
My yard looks like Sanford & Sons. Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread. Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want. CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable. |
#44
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Re: Radiator Fan Override Switch (The Easy Way)
Noted and fixed (I think). You could also use a relay on the battery lead, controlled by a keyed source as well, but it would be a little more work. I like fyrfytr's approach in that it lets the PCM still run things, but I don't see any issues with this since the PCM doesn't care what is or is not connected to the fan wiring.
Last edited by hubs97xj; July 12th, 2010 at 15:50. |
#45
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Re: Radiator Fan Override Switch (The Easy Way)
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Last edited by CharlesS; July 12th, 2010 at 16:48. |
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