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Old 09-11-2009, 12:22 PM   #1
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Question Clutch Safety Swtich problem and question...

Hi all,

I have a 1999 Wrangler Sahara 4.0L and recently the Clutch Safety Switch broke off where it attaches to the firewall under the dash and now slides up and down the clutch pedal push arm. As far as overiding the startup of the Jeep, there's no issue...I can start it just fine. My question is... Does this switch also control or effect rpms increase, almost like a slip out of gear, because this sensor/switch is telling the Jeep the clutch is slightly pushed in even though its all the way out?? In other words, is it possible that the Jeep thinks the clutch pedal is slightly depressed even if its all the way out? Lastly, can anyone explain how to remove and install a new switch/sensor? Specifically, will I need to disassemble the entire clutch/brake pedal assembly?

Thanks very much in advance to anyone who can help me. The Jeep runs but I know this rpm thing is not good for the clutch.

-Jason

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Old 09-11-2009, 01:16 PM   #2
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The interlock defeat fuse only bypasses the on-off interlock switch for the clutch. It has no intelligence nor does it tell the computer anything. I haven't had the need to replace that switch but with the fuse in the fuse panel, I doubt the interlock switch itself even needs to be there. Personally, I would remove it if I wasn't planning to sell the Jeep in the future.

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Old 09-11-2009, 01:53 PM   #3
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Thanks...

Thanks alot for replying... I'm pretty sure this particular switch/sensor, and I'm not sure what to even call it but it's located at the top of the clutch pedal and the clutch push rod slides in and out of it, regulates or tells the vehicle where the clutch stop position is. It seems as though it's in the wrong position when the pedal is fully out. Can I adjust where the clutch pedal is in relation to when it is in/out of gear? I read online that the way to test this particular sensor/switch is to get moving, then put on cruise control and approach an uphill. If the cruise control drops off without hitting the break, then the switch/sensor is bad. I really need help...I know my clutch is slowly burning up no matter how gentle I am.

-Jason
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Old 09-11-2009, 05:23 PM   #4
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Again, that switch has a very simple single function. It is a simple SPST (on-off) switch that only prevents the engine from starting unless the clutch is fully depressed. When the clutch interlock bypass fuse is installed, it only makes a connection across the switch so the circuit is enabled regardless of the switch or clutch position.
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Old 09-11-2009, 06:18 PM   #5
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Thanks again... Is that why when now I start it with the clutch completely pressed in, it won't start, won't even attempt to start? When I Press it all the way in, then let it out about 1/2 a centimeter and it kicks right over. It's clear to me that the clutch positioning is screwed up, but I have no clue how to fix it. I only thought it had to do with this part because all this happend when that part popped.

-Jason
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Old 09-11-2009, 06:47 PM   #6
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Look in your owner's manual and install the clutch bypass fuse and it'll start right up. You either install a 10a fuse into the #20 fuse location or a 20a fuse into the #10 location, I can't remember which because my '97 TJ is too old and doesn't use that same method to bypass the clutch interlock.

Then you can get into the driver's footwell and find the clutch switch and figure out if it fell out of the bracket that holds it. There is no adjustment if it's like mine, the bracket holds it in a specific location and the switch probably just popped out of the bracket.
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Old 09-11-2009, 07:26 PM   #7
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that long sleeve that slides on the clutch pedal push rod(clutch safety switch) kind of clips in place to the firewall and with it not clipped in place it is sliding back out with the rod not allowing it to start with the pedal depressed all the way( mine done the same)but mine was simply not clipped in tight and I was able to clip it back in.Never the less it has no affect on the clutch engagement at all.Pull the (i think) #20 -spare- fuse behind the glove box and it defeats the clutch safety switch all together.
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Old 09-11-2009, 07:33 PM   #8
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I just read Jerry's last post and I said pull the fuse but I think he is rite you have to put a fuse in the #20 slot even though mine is labeled spare.My fuse decal is 97 year model but the fuse box and dash wiring in my 97 are from a 99 so it works the same as yours only labeled different.
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Old 09-11-2009, 09:52 PM   #9
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Bypassing the switch

Yeah, I have already installed the fuse for bypass and the starting is still funny, but does work in neutral now. Starting it in neutral had stopped working when the switch broke or popped off, I can't tell if it's popped out of place or not. Here's what it looks like... There is a little white round hard plastic piece, that looks like it fits into the small hole in the firewall. Then there is a little black round rubber gasket type of thing that's also loose. Then there is the main switch cylinder which slides up and down the push rod freely currently. I'll lokk tomorrow morning to see if I can re-clip it or whatever back on.

-Thanks again, Jason
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Old 09-11-2009, 10:11 PM   #10
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im pretty sure your computer dosent know if your in neutral or not with a manual
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Old 09-12-2009, 04:24 AM   #11
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Correct...

I'm pretty sure you guys are exactly correct that the computer desn't know. What I mean when I say that it tells the vehicle when the clutch is depressed, I mean I heard there is a slit type knotch in the push rod that the switch rests a piece in and as the push rod goes in and out of the switch, that little knotch let's it know when the pedel is pushed in.

-Jason
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Old 09-12-2009, 09:43 AM   #12
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With the bypass fuse in you should be able to hit the key and not have to touch the clutch pedal to start it period, 1st thru 5th and neutral... No matter what gear the shifter is in the stater should engage with the pedal in or out!!!!!!!!!!!BTW That notch is just a notch no sensor or anything and the computer does not read anything to do with gear selection!!!
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Old 04-24-2010, 10:00 PM   #13
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Is this the same process in a 1995 YJ?
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Old 04-25-2010, 02:32 PM   #14
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Yea, that switch is nothing more then something you'd find at your local RadioShack parts bin. It simply is just making (or not making) contact when the clutch is pushed in for the ignition to happen (in laymen terms). That fuse determines if the clutch switch is linked or not, nothing else. It doesn't matter what gear the Jeep is in. You'd be surprised at how little your 99' manual Wrangler is computer controlled. So if it's a matter that the switch broke off and you want it, then go to your dealer and buy a new one and replace. If it's not important to you then be sure to not leave your car in gear and start it when it is in gear without having your foot on the clutch I haven't seen the switch you're talking about, but I would guess that it has two wires running out of the back of it. You could even solder a switch up on your dash to use as a bypass.

... I have to go, I just found my next mod.
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Old 04-25-2010, 08:24 PM   #15
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I put up a HOWTO a couple years ago -> Click Here

Looks like the pictures are broken right now...lemme see if I can re-post them.
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Old 04-25-2010, 08:32 PM   #16
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I should make another post as mine is a little different, I have an 88 YJ, took engine and auto transmission out of a 96 Cherokee that had been wrecked, also took complete wiring out of a 95 YJ and installed into my 88. Now it won't engage the starter the 95 had a 5 speed so figured it would be the clutch safety switch.
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Old 04-25-2010, 10:18 PM   #17
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When my Jeep was still under warranty, that switch started working intermittantly. The guy at the dealership said I could wait for new switch or he could bypass it. He tinkered around by the clutch pedal for few minutes and I have since had no problems. Be wary that the clutch is or it's out of gear before starting!
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Old 04-07-2013, 01:41 PM   #18
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Is this a comon problem on newer JKs as well? My check engine light popped up last night, switching between 1st and 2nd, got it checked at auto zone and it is says the clutch pedal switch is activated all the time. Kinda peeved since i dont even have 300 miles on it yet.

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