Question about 2002 Jeep Liberty

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How do I replace the PCM on my 02 jeep liberty? After days of testing Firestone told me that the code is a mis-fire in cylinder 2 and that it didnt make sense to them and take it to the dealer. I did and after two days of looking they told me that they need to replace the PCM and "probably" that would fix it. $895.00 out the door with labor. I see I can buy one of these from $175.00 to $350.00. I am somewhat mechanically inclined. Is this difficult? Thanks! Randy in Phoenix

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  • 144 Answers

No problem to replace, unplug the old one and plug in the new one,just make sure you get the correct PCM for your jeep

Posted on Jul 24, 2009

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Posted on Jan 02, 2017

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2 Answers

3.7 liter v-6 2002 Jeep liberty firing order


no job stated,
its not spark , 3.7L usa runs 6 COPS, all PCM fired direct
must be playing with what
CAMS
why not say the job, so we can be
ON THE SAME PAGE>?

if not in USA , now be like the time to say,no?
chapter 8 in service manual

posted VAST times,search much?

order-3kz44in2t3aazct2ooxw0hro-5-0.jpg usa official, book. from jeep,not NET rumors.

Mar 01, 2017 | Jeep Cars & Trucks

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Luz marcada con el numero cinco?


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2003 Jeep Liberty- Reading Engine / Diagnostic Codes ..... error code will flash 2 times, brief pause, flash 1 time, pause, flash 5times, pause, ...

2005 Jeep Liberty possible cause of P0442 error. - YouTube

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Jeep Liberty Questions - Cylinder Misfire code - CarGurus

www.cargurus.com > Questions > Jeep > Liberty

CarGurusMay 27, 2009 - My jeep Liberty 2009 does the same the Dashboard showed a code of cylinder .... i have a jeep liberty 2006 with the # 5 cylinder misfire. i replaced the sparks... I have a 2005 Jeep Liberty 6 cylinder, engine light came on scaned the ... 2002 jeep liberty camshaft posistion sensor error code p0340 5 answers.

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Recently got a second hand 2005 Jeep Liberty Sport. Everything worked fine ... #5intake valve seat dropped and held open the intake valve. 2008 Jeep Liberty.

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www.obd-codes.com/p0305


Dec 08, 2015 | 2005 Jeep Liberty

1 Answer

2001 grand Cherokee. Code P0300


po300 is a random misfire, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. If it was a po302 this means its #2 cylinder thats misfiring,ETC, But po300 could be any one of the cylinders. check plugs, wires, fuel injectors, Etc. Good-Day!

Jul 31, 2014 | 2001 Jeep Grand Cherokee

1 Answer

Replacing Fuel Injectors


there is a 100s of pages for electrics in the FSM>
or at alldata.com
but you must know what engine you have first.

what kind of diagram. there are many, mech. electrical, , assemble, etc.
the injectors have a common 12vdc power feed.
then each injector is fired with a single wire from PCM to each injector
this is done using a power transistor in the PCM.
it acts as a switch grounding the injector for say 5/1000 of a second
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Mar 22, 2014 | 2002 Jeep Liberty

1 Answer

2006 jeep liberty: rough idling, when I press on the gas the car jerks, check engine light is on, replaced the fuel injector #1, coil, and spark plugs. Took it to firestone and they said the fuel injector...


P0301 is a misfire in cylinder 1. This can be a lot of different things, but it seems you've already been throwing parts at it. I would recommend a compression test to test for a leaking gasket or a bad piston ring or valve.

Oct 22, 2013 | 1996 Jeep Grand Cherokee

1 Answer

CODES P0300, P1128


po300 is random miss fire doubtful two O2 sensors bad at one time most likely coolant temp sensor is bad causing engine to run rich this will cause O2 sensors to throw a code(thats what they are there for..exhaust gas temp. and raw fuel) running rich will also fowl spark plugs(=miss fire) P1128 ??

Mar 20, 2013 | 2006 Jeep Liberty

1 Answer

2002 jeep liberty, engine doesnt want to stay running,must give throttle,hard start. heavy misfire when running, codes P0202 and P1282. thinking its a pcm issue?


check security of the wiring for fuel injector for cylinder #2. Check resistance of this injector and compare the reading to another injector. replace if needed

There may be an issue with your fuel pump relay or its wiring. however service injector first to see if trouble code does not return

Nov 04, 2010 | 2002 Jeep Liberty

3 Answers

Firing order diagram 2003 jeep liberty which is #2 cylinder


You didn't supply the engine size,so I include both options.

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Aug 28, 2010 | 2003 Jeep Liberty

5 Answers

2002 Jeep Liberty 3.7L Engine Swap to newer 2004 engine


Has anyone made this work yet? I have the same problem 2002 jeep 3.7 and just installed a 04 motor. Timing is off. Some one had a good idea of mounting the crank gear to the out side of the harmonic ballancer and mounting the sensor with a bracket. What about the cam gear on the left side. Does the timing cahain have to come off to remove it? Or has any one swaped the wiring harnest, and computer.
Please email me back. pcardoso@cogeco.ca Thanks for your help.

Jun 25, 2009 | 2002 Jeep Liberty

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