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Old 01-25-2020, 11:59 AM
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JK 6spd won't start w/ clutch depressed

Morning all.

To start off, yes, I've searched this and other JK groups for a solution, and most of the posts I've come across tell me how to bypass the issue; I'd rather not, and instead fix it. Here's my issue:


Intermittently, our 2008 JK "X" 6 speed manual would not start when the clutch pedal was depressed. We'd wait a second, press the clutch in again, and she'd start fine.

As this problem always solved itself, I let it go. Then, about a week ago the clutch master cylinder finally went (the symptoms were there prior, I just misdiagnosed). I replaced the clutch master cylinder, which required me re-installing the existing Clutch Starter Safety Switch (located on the side of the clutch master cylinder). The Jeep wouldn’t start with the clutch pedal depressed. I got around this by simply putting the Jeep in 4Low, which bypasses this sensor by design. I didn’t want to have to do this bypass forever, so I ordered a new Clutch Starter Safety Switch (Mopar 6802 9261AA).


Today, I installed the new “switch”; it fit in perfectly, but the Jeep still won’t start normally. I’ve pulled all the IOD (Ignition Off Draw) fuses (all good) to reset the system (i.e. J13, M10, M11, M13 and even M27); no change. The new clutch master cylinder appears to work fine; no leaking and shifting fine.


I know I can wire a bypass to the clutch safety switch to permanently disengage it, but I’d rather not. Any other ideas what’s causing this problem?

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Old 01-25-2020, 05:36 PM
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Update (more info): I noticed today, when not in 4L, I hear one 'click' while trying to turn the Jeep on, but it won't start. All the correct dash lights activate. If in 4L, she starts right up.

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Old 01-26-2020, 06:10 PM   #3
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Naples, FL? I may give your shop a visit when we go visit my Mother in Law who lives near Bonita Springs in a few months!

You may want to unplug the battery negative for an hour or so, and link the negative wire to the positive one to discharge all capacitors.

One culprit could be the connector or wiring for that switch.
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Old 01-27-2020, 10:14 AM   #4
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I would try jump the switch temporarily to see if it will start. That way you know if there's something wrong with the way the pedal is activating the switch. If you rule that out, I would try to follow the wiring diagram and test the voltage for that wire going into the computer.
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Old 01-27-2020, 10:42 AM   #5
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Does your Jeep have a sentry key. Possible issue with the WCM. My 09 will occasionally flash the red light on the dash and the low tire would light up on the dash as well. I have a Pioneer NEX with a Maestro which gives me tire pressure readings so I used the ProCal to shut down the warnings. Never had an issue starting the Jeep but I am thinking I will have to replace the WCM at some time in the future.
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Old 01-27-2020, 10:06 PM
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Quote:
Originally Posted by cdeslandes View Post
Naples, FL? I may give your shop a visit when we go visit my Mother in Law who lives near Bonita Springs in a few months!

You may want to unplug the battery negative for an hour or so, and link the negative wire to the positive one to discharge all capacitors.

One culprit could be the connector or wiring for that switch.

Sure, come on by our shop; 347 Airport Pulling Rd N., Naples; rear portion of Mercantile Plaza (behind Good Times Diner), directly across from the Naples Airport.


I've tried the unhooking the battery thing; no luck. I think the new Mopar part is bad; I'm going to try a replacement 'new' part.
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Old 01-27-2020, 10:09 PM
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Quote:
Originally Posted by Blastek View Post
I would try jump the switch temporarily to see if it will start. That way you know if there's something wrong with the way the pedal is activating the switch. If you rule that out, I would try to follow the wiring diagram and test the voltage for that wire going into the computer.

Thanks. I think the new Mopar part is bad; I'm going to try a replacement 'new' part.



In case that's not the issue, how is temp jumping the switch any different than using 4Low to start the Jeep? Either way it bypasses the clutch safety switch. Am I missing the significance of one or the other?
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Old 01-27-2020, 10:12 PM
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Quote:
Originally Posted by terpsmandan View Post
Does your Jeep have a sentry key. Possible issue with the WCM. My 09 will occasionally flash the red light on the dash and the low tire would light up on the dash as well. I have a Pioneer NEX with a Maestro which gives me tire pressure readings so I used the ProCal to shut down the warnings. Never had an issue starting the Jeep but I am thinking I will have to replace the WCM at some time in the future.

Yes, I believe it does have the "chipped' Sentry Key. I'm thinking the key and/or WCM aren't the issue as she starts when in 4 low...
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Old 01-28-2020, 10:51 AM   #9
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Quote:
Originally Posted by Lockdown View Post
Thanks. I think the new Mopar part is bad; I'm going to try a replacement 'new' part.



In case that's not the issue, how is temp jumping the switch any different than using 4Low to start the Jeep? Either way it bypasses the clutch safety switch. Am I missing the significance of one or the other?
Temporarily jumping the switch would let you know if:
(a) the new replacement switch you got was bad without buying another
(b) the pedal somehow isn't activating the switch. I haven't looked at the JK NSS yet, so I can't speak to whether that's possible.

Jumping the switch permanently isn't an option. You'll likely get a check engine light for Clutch Switch High and your cruise won't work (if you have cruise on that year)
jaysong and Lockdown like this.

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