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Unread 06-23-2007, 02:14 PM   #1
jwalderbach
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1993 FSJ Cherokee 
 
Join Date: Jun 2007
Location: Marion, IA
Posts: 3
1993 Jeep Cherokee Sport: Crankshaft Position Sensor and MAP

My Jeep randomly sputters and/or stalls out while driving at low speeds and high speeds. Sometimes I am able to hear it sputter and pump the gas several times to keep it going but it's becoming less and less effective. So I replaced my plugs, wires, rotor, dist. cap, fuel filter and had my fuel injectors cleaned at the Jiffy Lube. Yes I know not the best but hey it was only $30. But the problem still remains. I turn my ignition from on/off/on/off/on and the check engine read back a code 12, 11, 14, 14. Yes 14 came out twice. 11 says a bad crankshaft position sensor and 14 is a bad MAP sensor.

Question 1: Can the CPS give a false bad MAP sensor reading?
Question 2: Can the MAP sensor give a false bad CPS reading?
Question 3: Where is my CPS? The Haynes manual says it's on the transmission bell housing but that means nothing to me. Could someone send a pic or very detailed directions on where this is located?
Question 4: Where is my MAP sensor? Again the manual is too vague for my level of knowledge.

I'm very short on money for two weeks so I hope to only replace one sensor if I can. That's why I'm wondering if one bad sensor can make another look bad too. But if I have to replace both then so be it. If there is anything else anyone could suggest let me know. Thank you in advance.

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Unread 06-23-2007, 04:09 PM   #2
jwalderbach
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1993 FSJ Cherokee 
 
Join Date: Jun 2007
Location: Marion, IA
Posts: 3
CORRECTION: I read the codes wrong. Should read:

My Jeep randomly sputters and/or stalls out while driving at low speeds and high speeds. Sometimes I am able to hear it sputter and pump the gas several times to keep it going but it's becoming less and less effective. So I replaced my plugs, wires, rotor, dist. cap, fuel filter and had my fuel injectors cleaned at the Jiffy Lube. Yes I know not the best but hey it was only $30. But the problem still remains. I turn my ignition from on/off/on/off/on and the check engine read back a code 12, 24, 11, 55. 11 says a bad crankshaft position sensor and 24 is a bad TPS.

So now my questions are:

1. Would a bad TPS make the CPS look bad or vice versa?
2. What would be the most likely problem of the two, in other words which should I replace first?
3. Still need help finding the CPS. Any pictures or detailed directions would be awesome.
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Unread 06-23-2007, 04:19 PM   #3
cygnus58
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1988 XJ Cherokee 
 
Join Date: Jun 2007
Location: pa
Posts: 43
CPS
Find it, and replace it. period.
On older models it's about 11'oclock position on the top of the bell housing, two wires. Best 40-50 bucks you'll ever spend.
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Unread 06-23-2007, 08:19 PM   #4
jwalderbach
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1993 FSJ Cherokee 
 
Join Date: Jun 2007
Location: Marion, IA
Posts: 3
Quote:
Originally Posted by cygnus58
CPS
Find it, and replace it. period.
On older models it's about 11'oclock position on the top of the bell housing, two wires. Best 40-50 bucks you'll ever spend.
Actually Advanced Auto Parts wants $75 for a CPS. But going back to it's location, I'm a noob and I don't understand what a bell housing is. Damn it Jim I'm a techie not a grease monkey! :-p Am I looking for this from on top or underneath? I've read that I can do it from both on many sites. http://www.jeepforum.com/forum/f11/crank-position-sensor-write-up-197260/ has some good info but the 2nd pic, from above, I'm not seeing anything within that red box.
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Unread 07-24-2007, 11:46 AM   #5
mxw1
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Join Date: Jan 2007
Location: santa maria, ca.
Posts: 12
random stalls

Cherokee stalling; fixed!

--------------------------------------------------------------------------------

Hi Boys and Girls,
This is my first post. I hope I can help someone with this info.

My daughter has a 1994 Cherokee that has had the random stalling, I've been trying to fix for about a year, I believe I fixed it this weekend! I am happy and want to share what I found.

The first thing I changed was the Crank sensor, then ignition coil, the pick-up coil inside of the distributer.

It finally stalled on me while test driving and I noticed just before it stalled, the Check engine light flashed on. I grapped my fault code decoder and found an error code for the throttle position sensor signal low. I checked the sensor and indeed it was close to zero volts (.5 volt is required output at idle). I bought a new TPS installed it and started it up, but now the check engine light was on all the time. I checked the error codes again, this time I had a low voltage from the TPS and MAP sensor. I checked for a 5 volt supply from the computer to both sensors and it was gone. I removed the 60 pin connector plug at the computer to check the continuity of the wires to the sensors ( the MAP and TPS share the 5 volt supply from the computer ) and found several of the pins were corroded. I don't remember the pin numbers but one of the corroded ones was the 5 volt supply. I cleaned those up and problem went away.

Check your ECM connections!

Mike
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Unread 08-10-2007, 12:31 AM   #6
retracal
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Join Date: Aug 2007
Location: Tennessee
Posts: 1
98 Jgc 4.0

ok guys I have read no less than a million posts for this problem. ..one morning I came out and my jeep would crank but not start. from these posts i just went and bought a cps and took it to the shop and they put it on.I drove home and within a mile or two it started missing and acting like no fuel. Back to the shop. Computer put out a code of " fuel sensor output too high". I guess my question is..can replacing the cps incorrectly cause this code. I had no problems before, and since the cps fixed the no start, doesn't it seem strange that it would miss like this when it has never done so before? I am thinking it was installed incorrectly or was a defective part, but before I go back to the shop, I would love some input. Any help you can give would make my year. Thanks.
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