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Old 11-28-2012, 04:23 AM   #1
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2004 Rubicon dead to the world

I went to start my jeep the other day, turned the key and the gauges started going haywire and no start. Opened the hood and noticed corrosion on the battery. I cleaned the posts and reconnected. Now when I turn the key everything comes on i.e lights radio heat/AC. But the jeep won't crank/start. I assumed it was the starter so i replaced it. Still no luck. I changed out the battery. Still nothing. I checked all of the fuses and replaced the relay. Help....

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Old 11-28-2012, 04:37 AM   #2
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Is it an auto?

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Old 11-28-2012, 06:16 AM   #3
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No its a manual. I can push start it..
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Old 11-28-2012, 06:20 AM   #4
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No its a manual. I can push start it..
Have you checked the CPS or the fuel pump? After that, I'm out of suggestions....Sorry

Maybe this thread will help?
http://www.wranglerforum.com/f5/jeep...cps-48529.html
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Old 11-28-2012, 06:25 AM   #5
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No its a manual. I can push start it..
If you can push start it then it sounds like the clutch interlock switch.
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Old 11-28-2012, 06:29 AM   #6
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What is the clutch interlock switch? Also what is a CPS? I appologize for my ignorance. Normally I would have taken my jeep to a mechanic by now, but I'm in the military stationed in Italy. Not a whole lot of Jeep mechanics floating around.
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Old 11-28-2012, 06:38 AM   #7
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CPS= Crankshaft Postion Sensor
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Old 11-28-2012, 01:30 PM   #8
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What is the clutch interlock switch? Also what is a CPS? I appologize for my ignorance. Normally I would have taken my jeep to a mechanic by now, but I'm in the military stationed in Italy. Not a whole lot of Jeep mechanics floating around.
Clutch interlock switch. There's a switch, usually on the clutch pedal assembly, that will only let you run the starter when you push the clutch pedal down. If that breaks, the starter will never crank because the circuit is held open.

CPS: Crank Position Sensor. It's a sensor attached to the bellhousing right where it meets the back of the engine. It tells the computer how fast the engine is rotating, along with identifying when the #1 piston is reaching top dead center. They have a habit of going bad after many years of good use. When it goes, the engine dies entirely. When you swap a new one in, it works perfectly again.
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Old 11-28-2012, 03:36 PM   #9
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Clutch interlock is good. I also placed a 20A fuse in the empty fuse slot to bypass it. Is there a method to check the crack position sensor other than just buying a new one?

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