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.
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.
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.
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.
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.