XXLMJ Posted October 13, 2009 Share Posted October 13, 2009 I have a 89 MJ with a 91 Cherokee motor 4.0 The guy also put the cherokee doors on it,power windows and locks. I'm having problems with the security system now. I parked the jeep one night, the next morning it would only start for a sec. then die. I can keep it running on starting fluid. So i changed the fuel pump. Same problem. SO if anybody has any ideas on how to bypass this system I'm listening. Or if you think its another problem please tell me. Link to comment Share on other sites More sharing options...
Geonovast Posted October 13, 2009 Share Posted October 13, 2009 So it starts up, runs for a second, then dies? Sounds to me like your ballast resistor is shot. They didn't have any security systems that I know of. Link to comment Share on other sites More sharing options...
lostissues Posted October 13, 2009 Share Posted October 13, 2009 only suggestion is that maybe the PO installed a fuel pump cut off switch? if that is the case, look for wires, switches or other things that do not look factory and then unhack whatever he did. Link to comment Share on other sites More sharing options...
Jakeman17 Posted October 13, 2009 Share Posted October 13, 2009 Maybe Check fuel pressure shorted out injected causing all to short(talked about at school lol) Link to comment Share on other sites More sharing options...
XXLMJ Posted October 13, 2009 Author Share Posted October 13, 2009 The fuel pressure is holding a 31-40 all the time. I know it isn't losing spark. I jumped the 2 wires going to the ballast resistor and i does the same thing. What about a crank position sensor? I am pretty sure my MJ has a security system cause if you disconnect the battery and re hook it the lights start blinking on there own. I think the PO installed it so the power windows and locks will work. Link to comment Share on other sites More sharing options...
mfpdm Posted October 13, 2009 Share Posted October 13, 2009 The fuel pressure is holding a 31-40 all the time. I know it isn't losing spark. I jumped the 2 wires going to the ballast resistor and i does the same thing. What about a crank position sensor?I am pretty sure my MJ has a security system cause if you disconnect the battery and re hook it the lights start blinking on there own. I think the PO installed it so the power windows and locks will work. Yeap, that sounds like the factory security system on the XJ's. When you unhook the battery and hook it back up, while the lights are flashing, lock and unlock the drivers door with the key and it should reset the system. If that doesn't work, do the same process to the passenger side door. The factory system only shuts off the fuel flow so yes you could start it and keep it running with another source of fuel. :cheers: Link to comment Share on other sites More sharing options...
XXLMJ Posted October 13, 2009 Author Share Posted October 13, 2009 lock and unlock the drivers door with the key and it should reset the system. If that doesn't work, do the same process to the passenger side door.] The drivers door has that door pin broke off, i got a couple of them from a junk yard and replaced it. And i did try to lock and unlock the passenger door. I think this all happen cause my wife accidentally hit the lock button on the door the other night. I would like to eliminate this whole system if passable. I leave my doors unlocked and keys in the truck at all times anyway. Link to comment Share on other sites More sharing options...
mfpdm Posted October 14, 2009 Share Posted October 14, 2009 There is a couple of different fixes to disable the security system. Here's a couple of links that may help. http://www.naxja.org/forum/showthread.p ... t=security http://www.jeepforum.com/forum/f11/jeep ... em-388068/ http://www.naxja.org/forum/showthread.php?t=9413&page=2 :cheers: Link to comment Share on other sites More sharing options...
XXLMJ Posted October 14, 2009 Author Share Posted October 14, 2009 I have done the green and orange wire thing, ran it to ground. If i disconnect my battery i can get the alarm to go off, then ground that green wire, and it shuts the alarm off. Or at least the lights quit blinking. But the truck still starts runs for a sec or 2 and dies. So is it really the alarm or do i have a sensor problem now? Link to comment Share on other sites More sharing options...
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