Question about 2001 Jeep Cherokee

2 Answers

I am throwing codes PO353, PO352, PO351 on my 2001 Jeep Cherokee Sport. 4.0 2WD. Its saying I have misfires. I was going down the road and the engine just stalled out. It would start right back up and idle nice, but as soon as you would give it throttle, around 1,200 RPM, it would stall. I have changed out the coil rail twice, new camshaft sensor, new crank sensor, new throttle position sensor, new idle air control sensor, new spark plugs, checked all wiring, and vacuum hoses, did a fuel pressure check, it just fine. I even took the exhaust apart to see if the converter was clogged, its not. It still will start up, sometimes it will crank for awhile, burp, bang, and cough but it will start up and idle. It will idle forever. Anybody have anymore ideas?? Thanks, Randy.

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  • john ingall
    john ingall Dec 12, 2016

    same exact issue... had some issues with ASD relay with it. replaced computer and it fixed the ASD relay issues but same coil problem doesn't always start but when it does it will idle until rpms are raised then will sputter and die... everything is checking out ok (wires, sensors)already replaced computer and had dealer flash it

  • Rwylie Jan 26, 2017

    Did you ever find the issue with your jeep? I'm having the same issues with my 2000 cherokee 4.0. Drives fine for a while and then loses power and we coast to the side of the road. It doesn't cut off, but the gas pedal is all the way to the floor but it won't run. If I wait a few mins it will start back up and drive again for a ways and then repeat the problem. It throws codes po352, po353 and po1391. Replaced the crankshaft position sensor, cam sensor and battery. I've had it at 2 different mechanics and they can't figure out the issue. The plugs and coils are good. I thought about bypassing the converter to see if that was the issue but it isn't throwing those codes and I have 3 converters. I can't keep replacing parts. Any ideas?

  • _-__-___-_
    _-__-___-_ Jan 26, 2017

    Rwylie, 4Liter only , all trans ! RELIC post rehash 101: 6 year ago, did you fix it? LOL
    Piggybacking really makes a mess no?
    mix your horrors with others, but here goes.
    first off we can't see what you did wrong.
    in many cases the owner of a car will play with parts that should not be messed with.
    CMP and CKP are those, do not fiddle them
    until you read chapter 8d and let that sink-in first.

    either fire your mech, find a real ASE shop.
    hell even the dealer can fix it. THEY CAN.

    352 coil B weak (try a coil yet,why not?)
    353 coil C same
    1391 Intermittent Loss of CMP or CKP BINGO 1st

    Fiddlers nightmare1:
    ok did you put the CKP in wrong?
    with the spacer missing, id need the exact transmission type and name to do it right
    if you do this wrong you migh wreck 5 new ckp sensors. the adjustable sensor can not just be thrown in willynilly.

    Fiddler nightmare 1:
    CMP that cmp mounts where the old skool distributor mounts, it too can NOT be thrown in, willynilly, sorry, but can not.''
    unlike the old distrib days like 1999 back
    this is now the Injector SYNC sensor
    and needs factory tools to CALIBRATE.
    chatper 8d page 5 see link to that chapter below. end.
    The CMP does not run ignition, stated in that same chapter. it runs injection,
    but does tell the PCM where cam is located and
    what coil to fire of the 3, but do not determine spark advance nor exact timing.
    CKP is timing base.+ PCM advance.

    quote:
    NOTE: Do not attempt to rotate the oil pump drive to modify ignition timing.
    unquote !

    CKP sensors 4.0L
    quote
    † with one bolt (Fig. 24). If sensor is equipped
    with one mounting bolt, it is adjustable..
    † with two nuts (Fig. 25).
    † with two bolts (Fig. 26).
    see that?
    there is also a 1 bolt CKP that is not adjustable, this version with SLOT
    can be just stuffed in willynilly


    that adjustable one can not be thrown in ever with out the paper .030" spacer
    Ok CMP base clamp bolt not touched.
    ok CKP if adjustable is installed with spacer
    ok what is next the below first
    this will not go away if above is ok.

    id fix, code 1391 first
    and not address coil packs until 1391 is clear.
    once its cured, then check the 3 coils first
    there are coils there.
    called wasted spark.

    this car was sold with over 5 transmissions
    and each have a different bell housing
    and each have its own CKP
    sorry but the FSM covers all that,
    4 a/t and 1 for the m/t stick box like my 99.
    and most stores, not jeep

    do not SELL all versions of that CKP sensor.
    none do , IMO, just the real jeep sales counter.


    the CKP with one hole and bolt and slotted
    must have the .030" spacer added to the end of the sensor, (in one store they made me buy it separate, oops that is evil there )
    its just cardboard, with some glue.

    it gets kicked off at first start
    getting that critical gap correct.
    too hard work for me to get gap spec, so..
    there you go.
    i make my own spacers from junk cardboard.
    now the CMP
    its has 2 bolts. and are not slotted.

    Last and not least that infernal COIL RAIL pack 3 coils there; inside
    it can fail, sure as shoot'n
    It take hard work to rack it back to do a spark test, sure does.
    not only that it can short out 6 ways and blow up the ECU coil rail driver transistors
    in the ECU.
    so it be wise to buy new rail any time
    only the codes for coil rail trip.
    P35x codes.
    all are coil currents wrong.
    get it out now and save that expensive ECU.
    that is it, that's all folks,,,,,,munch munch

    chapter 8D
    read it.http://jeepdied.com/look/24hr/2000xj-ch-...

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2 Answers

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  • Jeep Master
  • 20,706 Answers

Greetings john ingall Dec 12, 2016
piggy backers.. old. why not start a fresh post for only your car and not mix up other symptoms.
did play with the CMP or CKP. then cause p1391.
oops...a daisy.... you did it wrong.
Id not attack coil rail until the 1391 is cured, not me.

1: scan it ? post all DTC now.
2: DTCs trouble codes..????
3: is the ASD dropping off line, while running? (a key fact to know)
4: ever get a tune up this decade?????
5: spark gaps correct , to factory spec, and kept here doing repeated service? )
6: Do the scans show the IMMO tripping the ASD off line????
there are 8 reasons for ASD to trip , and cause a stall, all 8 are reported !
there are 50 other reasons for stalls, called misfiring...
the service manual is clear (p035x's)
Peak primary circuit current not achieved with maximum dwell time.
This means that the PCM charged to coil fully
and the current was way too low.
that means it found (out of spec) current.
even zero current,
means coil burned up or the transistors to it.
gee, id have the rail off and check each coil
there are 6 coils, 3 primary and 3 secondary
the SM cover this test, as all do so read it.
it can also be bad connections(wires) to same.
(crude, 5ohm pri, 20k secondary ohms)

OUR 4.0l HAS A RAIL PACK, COIL
WITH 3 COILS inside, and uses wasted spark to fire all 6
and if one coil fails you will loose, 2 cylinders, due to series HV wring, unless 1 wire shorts, but if one opens you loose 2 cylinders.
( Kirchhoff's laws 1; an open in series circuit flows no current, so both spark plugs go dead.

unless rich and super lucky , try using a scan tool
when the engine misfire, or stalls.
and report all errors seen, DTCs, a win/win.
the schematic, see F18 fuse , the coil pack
super simple no? ,yes, but not on PCM end. (Ask)
here.I am throwing codes PO353, PO352, PO351 on my 2001 - dac293a8-5823-4d8e-8165-130c10d9e961.jpg

Posted on Dec 25, 2016

  • 3 more comments 
  • Anonymous Dec 28, 2016

    starting your own post , is a WIN/WIN
    the car is far more complex than you imagine.
    x10.

  • _-__-___-_
    _-__-___-_ Jan 26, 2017

    if you put the cmp in wrong then did the CKP
    wrong
    omg, you really need to learn to read the SM
    never mess with engines timing
    guessing,
    read the service manual,
    first
    not guessing
    not thinking is rice burner
    its JEEP

    then when engine timed right maybe bad coil pack

  • Anonymous Jan 26, 2017

    the internet really sucks
    like one zillion posts. for misfire
    change the CMP and CKP (says the dweebs)
    now car has 3 problems
    why do that. ?
    if you had not make the wild error.
    then the coil packs are bad. 35x
    that is what the codes tell you is the coil primary windings are open or burned up.
    wrong current flowing is that due to too much coil resistance or burned.
    i hate to say this but once you mess your car up this bad, only a dealer can fix it.
    for sure.

  • _-__-___-_
    _-__-___-_ Jan 26, 2017

    The drivers are really called
    IGNITOR transistors. they are powerful.
    if a coil shorts out, the PCM can smoke a driver.
    on some cars (not jeeP it's, adriver box on the fire wall, nice to have , for sure)
    the put them in the PCM to save $$$$$
    not your cash, there's.

    end popular piggybacked 3 times OLD POST

  • _-__-___-_
    _-__-___-_ Jan 27, 2017

    ALL EFI coils can burn up
    if the ECU fails and shorted a transistor
    the coil overheats and dies.
    in fact, both ways can do that.
    whomever shorts first ,kills the other.
    called cascade failures in electronics.
    on our race engine, we control dwell very carefully, and if too long, the coil burns up. (we increase dwell at highest RPM)

    this is because, HEI , uses huge currents to get that high energy levels. all do.

    unlike the old days 1960 and long dwell or 100% on at key on, points closed.
    most EFI coils are limited to about 10/1000th
    second dwell max , or it overheats.
    10mS. dwell at huge currents, then releases
    and BAM Telsa Induction happens.

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  • Jeep Master
  • 11,061 Answers

P0353 JEEP - Ignition Coil 3 Circuit

P0351 JEEP - Ignition Coil 1 Circuit

P0352 JEEP - Ignition Coil 2 Circuit

Read more: http://www.autocodes.com/p0352_jeep.html

PCM drivers shorted , new PCM Or you have wiring problem .
The problem with coil on plug ignition systems , all make vehicle . The spark plug gap get's to large and the spark can't jump that gap and fries the coil an feeding high energy spark to the PCM frying the transistor inside . Most of the time i don't say to much but dam dude you replaced all those parts , you like making part stores rich . You could have had it fixed at a qualified repair shop for a lot less . There are videos on youtube on coil on plug ignition system testing

Posted on Dec 12, 2016

  • Jeff Armer Dec 12, 2016

    https://www.youtube.com/watch?v=ho3Kyps2...

  • Anonymous Jan 26, 2017

    that is correct if only that error
    and the person playing did not play with CMP or CKP (removed them lost sync)
    then coil bad, or the ignitor is bad
    if the ignitor transistor is weak, so will be the current.
    try coils first. pray. not worse.

    a coil and and ignitor is not rocket science
    all EFI cars have this.
    even 1988 had it.

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