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Engine immobilizer bypass

Hi, i own a 1999 xj jeep cherokee auto 4 litre and what i believe is the engine imobilizer light came on one morning as i tried to start it to go to work, i cannot start it even though the engine turns over and none of the jeep dealers in the south queensland area want to touch it as it's duel fuel. it was running perfectly the night before the morning it stopped working, it is a very nice vehicle and an engine swap is looking like the only way to bypass the imobilizer and computer , i like the features that the car has got and really don't want to have to that avenue if possible. any sujestions would be greatly appreciated, thank, bryan.

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  • Jeep Master
  • 20,706 Answers

I love posts that have the word bypass.
99XJ. (why not join the forum for Cherokees)
that dealer just gave you a wave off for nebular reasons.
the truth is its illegal for him to do what you ask.
never ask a dealer to bypass something like this. it's futile.
but do feel your pain, that really sux.
on the newer jeeps, the IMMO NOT bypassable.
(one guy bought a PCM that has no IMMO option and got that to work, imported from another country.
read this security page here.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
quotes:
Once the VTSS engine no-run feature has been enabled in the PCM, it cannot be disabled.
1998 you can
If you are needing to DisArm the Factory Alarm:
Find the PURPLE / YELLOW (-) wire located in the Driver Kick Panel / Door wire harness (harness that goes into door)
Ground the PURPLE / YELLOW (-) wire

there is a company in Florida that will change your PCM
to disabled.
another:
http://xpresskit.com/VehicleCompatibility.aspx?p=null&year=1999&make=Jeep&model=Cherokee&ps=1&s=0&c=0

seems you lost your 3 key fobs.
always have 3, 2 are required for you DIY to make a 3rd.
in the USA we must tow the pig to the dealer.
and say, give me 2 keys and make it work
then go home and make a 3rd with DIY key, even a no fob button key works. cheap. (transponser only key) i have mixed brand keys running all fine. That is the way.... if that its not possible for you.
i bet you didnt ask them that. right> get 2 keys working.>
so the only way to bypass is to do research on
How to get remote start working, they have the cure.
or the Florida ECU shop. ( i lost the link, dang)

http://www.pirate4x4.com/forum/jeep-hardcore-tech/407998-smart-key-immobilizer-module-how-disable.html

Posted on May 03, 2014

  • 27 more comments 
  • _-__-___-_
    _-__-___-_ May 03, 2014

    i found it, its in my skim files.next link

  • _-__-___-_
    _-__-___-_ May 03, 2014

    http://autocomputerperformance.com/

  • _-__-___-_
    _-__-___-_ May 03, 2014

    talk to them. they too might not do. flexfuel. I DONT KNOW.

  • _-__-___-_
    _-__-___-_ May 03, 2014

    and this...warning. to you and all......... googlers.

  • _-__-___-_
    _-__-___-_ May 03, 2014

    Do not put your Wifes no SKIM PCM in to your SKIM active car or, you just bricked your Wifes PCM, bingo, two dead cars.

  • _-__-___-_
    _-__-___-_ May 03, 2014

    To err is human , to really foul things up?, it takes a computer.

  • bryan verrall
    bryan verrall May 19, 2014

    i don't think my xj has an alarm , all i want to do is get the car running again so i can drive it, the immobilizer system is a stupid idea that has meant the death of many a good car,it's just another way for jeepaustralia to rip people off, you'd think that they would have enough sense to find parts needed to fix the problems at cost price or even better a factory recall for obviously trashey parts

  • _-__-___-_
    _-__-___-_ May 19, 2014

    I agree on that, it is the dumbest idea. id bet it strands more folks than it ever stops a thief. (untold facts of life) it may suprise you , that Jeep stealer ships in the USA show more profits fixing cars than selling them( one of the few co. ever to state that truth here) many folks here had to have car towed to a stealership to bet the immo working. many 1000s. If you want a solution why not join the Jeep forum. and get the truth. each year (generations) are different, , in my personal case my 08 can not be bypassed. (in fact that is the #1 goal of the design !!!) on the 1999 , im not sure. its and exprort model and for sure ive never seen any Auz, jeep. But you can read the immo page. IN the FSM. here i will post the forum link so you can join them and tell them your delima.... my parting words are , you need 2 working fobs at all times. on mine 3. if not , you must tow it to the dealer. Dual fuel is that factory dual fuel or custom aftermarket modified dual fuel. if the latter sure they dont want to touch it, its CUSTOM, they have no idea at all what you have.. buying or making custom cars reaquires a short leash to the maker (designer) if not , you get standed, best pratice for DD cars.? is to buy what is common in your town and what is sold and serviced in your town. or learn to fix them your self. (hard study) hit 1: http://www.cherokeeforum.com/ >>>> hit 2>>> http://www.cherokeeforum.com/

  • _-__-___-_
    _-__-___-_ May 19, 2014

    http://www.cherokeeforum.com/

  • _-__-___-_
    _-__-___-_ May 19, 2014

    http://www.cherokeeforum.com/

  • _-__-___-_
    _-__-___-_ May 19, 2014

    http://www.jeepforum.com/forum/f11/

  • _-__-___-_
    _-__-___-_ May 19, 2014

    sorry for extra post. my cuts and pastes are messing up.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    You need to read all words on Immoblizer. learn how it works read that and understand how it works and what are you options, on may cars there are no options, just fix it. "BY DESIGN" the system even discovers hacking, now, and bricks its self.. by DESIGN. the first thing on all cars with electric issues, is to make sure the fuse test good, note I said test., do not just look at em. then check battery voltage. 12.6vdc is good, less is suspect and for sure cranking. ever below 10v, Jeep says 11v. but the PCM will go nuts below 10v.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    edit my to manym ,and ever = even. no editer here, that is why using a real forum rules, yo can post and edit. and correct errors. or add content, but no here, its more like CB radios here, (noise)

  • _-__-___-_
    _-__-___-_ May 19, 2014

    btw2> i see one brand of thieves, from below the rio grande , that target cars in San Diego (jeeps) and have the PCM in their hand bag, that is IMMO free. defeating all attempt by the MFG to stop this. ALL this BS , is like the cartoon SPY versa's Spy, (in the MIL , I was an ECM tech. counter messures.. and that too was a joke)

  • _-__-___-_
    _-__-___-_ May 19, 2014

    i do feel your pain, I do, 100%

  • _-__-___-_
    _-__-___-_ May 19, 2014

    is this car onroad or off road car, only.? we dont know utility, i have 4x4 just to pull stumps. so.... usage is $100

  • _-__-___-_
    _-__-___-_ May 19, 2014

    100%

  • _-__-___-_
    _-__-___-_ May 19, 2014

    the engine swap is no solution, as that take a new ECU and kills vast numbers or other things. Dash guages. etc. if going to carb engine. same deal, many features on the the car go dead. you never stated drive line, got A/T or M/T tranny, my 99 had and M/T. and if you swap ECU the TCM tranny brain goes dead.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    and even saying SWAP , opens up a huge and newer more complex topic, (no donor stated by you, so is infinite topic)

  • _-__-___-_
    _-__-___-_ May 19, 2014

    on my jeep, the immob fob has a transponded chip (no battery) and uses encrpyted key passwords, that change every time you start car. you will never hack that. and if attemp to insert any non IMMO PCM the new PCM autobricks, becaust the other modules know car is IMMO car and that happens , there is a way to fool this, actions. read the jeep forum it tells you how. on mine you must remove the key decoder around the ign.key, and then installed the new PCM. but all this is on the RISK areas, as your car is the JEEP export model which we know zero about. really.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    here are some skim pitfalls.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    http://www.fixkick.com/Jeeps/SKIM.html

  • _-__-___-_
    _-__-___-_ May 19, 2014

    my guess is you have 1 FOB, right? and can not determine if the FOB is bad or the cars SKIM. so go to the dealer with old fob and registration, and ask them to make you a new fob, they have a system for that. they can program a new fresh FOB. with VIN and reg. this is the penatly for not having 3 fobs, or 1 fob and 1 clone keyonly, and 1 more key only. this allows me to start car even if I lost fob1, with clone transponder keys, i have, cost me $13 for key only key. and now i can program fobs all day along, well, unitl I hate the 8 fob limit, more more PITA.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    hate =hit. sorry

  • _-__-___-_
    _-__-___-_ May 19, 2014

    rule 1 , never buy a Immo car. if you can't stand them..

  • _-__-___-_
    _-__-___-_ May 19, 2014

    i can;'t but have many cars and can live with 1. JK.

  • _-__-___-_
    _-__-___-_ May 19, 2014

    WATCH the NEWS? and the RECALL (Clown show) is the MFG getting sued for cars that drive with foot off the throttle (toy) then in same moment (GM) getting sued for cars that stall. YOU CANT HAVE IT BOTH ways !, but the do try. and guess what with throttle by wire, if any if the 4 , TPS sensors (dumb idea) dont agree?, the PCM goes to limphome and1/2 the engine power gone, and more death from that idea. and more lawsuits. It a drama i love to watch. Imagine in front of loggning truck (omg) and cars stalls. (for stupid reasons) ???

  • _-__-___-_
    _-__-___-_ May 19, 2014

    the first PCM did all they could to keep engine running 1990s. then now, they do everthing it can to stall the car. Is it a better world? I think not.

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This is usually how it happens with Electric Fuel pumps. They either work or they don't. When you turn the ignition to on you should hear the pump engage and pressure up. If you don't most likely your pump is faulty. You mentioned that it did this after a freeze. It is possible that you have a frozen fuel line, Supply or return, will also cause this problem. The best you could do is move the vehicle into a garage and warm it up above freezing to allow the lines to thaw. A lot of time we get moisture build up in a tank without even knowing it. Cold fuel is supplied to the motor through the pump but the return line returns warm fuel and in a cold environment this will or can cause condensation to form in the tank and lines. Also bad fuel from a station will cause this issue. It doesn't take much with all the additives they put in fuel today. They sell fuel additive that will remove this moisture if that is the problem. try warming the vehicle up and thawing the lines. If this proves to be the issue you'll need to drop and drain the tank and lines to clear the problem or try a fuel additive to remove the moisture.

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