CRANKSHAFT SENSOR

Here is the location of the crankshaft sensor which is in the bellhousing of the transmission. Check out the diagrams (Below). Please let us know what happens.

Of the CPS??

Seems my jeep runs fine then all of the suddens its just shuts off, going at 40-50 MPH just completely shuts off, no sputter and shakes, just shuts off.
I put the jeep in neutral to find a safe place to park, then sometime i can restart right away then other times its takes 5-10 minutes to restart.

im thinking its the Crankshaft Position Sensor.

Where is this piece? I would like to replace it.

thanks

On left side of transmission bellhousing

Thank you very much!

I hope its solves my problem.

I have a 1998 Jeep Cherokee Sport with a 6 cylinder engine. Recently, I have had problems when I have driven it in hot weather. Several times, after I have stopped the car and turned it off, I have been unable to restart it. Once, the engine cut out on me while driving. The one time it cut out on me while driving, it was a very hot day and I had been driving for about an hour up a mountain. I had a mechanic check the battery and the alternator, and both were just fine, no problems at all there. I thought it might be vapor lock and have tried lifting the hood and placing wet rags on the gas lines, which has worked all but once which was the same time that the engine cut out on me while driving. I had a mechanic perform a computer diagnostic, which indicated that the crankshaft sensor is sometimes not registering. The mechanic said that if the crankshaft sensor is not registering, the computer will not allow the engine to start or to continue running. I asked the mechanic to replace the sensor at that time, but he could not get the part and I was far away from home. We waited a couple of hours until things cooled off and then I was able to start the car again and drive home. This has happened at least half a dozen times over the past 2 months and each time it has happened in extremely hot weather this summer. (I haven't had this problem in previous summers.) I have a few questions:

1. If this is vapor lock, why does it usually occur after I have turned the car off?
2. Is this something caused by the heat, or is it merely a coincidence that this has occurred on the hottest days this summer?
3. Could this be caused by a faulty crankshaft sensor or did the crankshaft sensor become faulty because of this?
4. Should I be looking somewhere else in the engine or electrical areas?
5. What can I do to fix this? (If you have more than one idea or suggestion, please let me know.)

If the computer scanner indicated a crank sensor is not being seen it could be a few things....First make sure that the wiring is good and it is not shorted or broken..If it's ok, hopefully you need a new crank sensor. If the sensor is replaced and you still have this issue - then the reluctor ring is probably to blame..The reluctor ring is connected to the crank shaft (inside of the engine). It is the thing that the crank sensor reads to tell the computer where the crank - at a certain time - during the rotation of the crank shaft..This ring can become loose and it can be affected by temperature. Usually the problem of a loose reluctor ring is experienced during the first few months of the engine life..Being that it is a 1998, it is rare that this would be the cause, but it could be. If it is the reluctor ring, the only way to get to it is to remove the crank shaft..cross your fingers.
Vapor lock can happen, but being that your fuel pump is located inside of the fuel tank and with the computer diagnostic indication, I would pretty much rule that out...

HOW TO SET AIR GAP ON CRANK SENOR

new sensor should come with paper spacer that slides into end

I,M REPLACING TRANS USINGOLD CRANK SENSOR BECAUSE IT'S NOT THAT OLD; NEED TO KNOW AIR GAP. THANK S FOR YOUR HELP.

is your CKP sensor attached with 2 bolts or just 1? if it is 2 then you just install it with those same 2 bolts and the gap will be correct

MY 98 JEEP HAS ONLY ONE BOLT.

Ok the paper spacer is the Air Gap it has no numerical value so if the old sensor is missing the paper you will need a new one

I am having an issue with my jeep. I am getting a code for camshaft/crankshaft position sensor. I am weary of which one this might be. I am backfiring occaisonaly and my gas mileage is suffering. If it is the camshaft sensor, is it in the distibuter itself. Thank you in advance

here's how to test the camshaft position sensor also the crankshaft position sensor OPERATION The camshaft position sensor, or CMP sensor is located inside the distributor. The ECU uses the CMP signal to determine the position of the No. 1 cylinder piston during its power stroke. The ECU uses this information in conjunction with the crankshaft position sensor to determine spark timing among other things. The CMP sensor contains a Hall effect device which sends either a 0.0 volt or a 5.0 volt signal to the ECU depending on the position of the distributor shaft. If the cam signal is lost while the engine is running, the ECU will calculate spark timing based on the last CMP signal and the engine will continue to run. However, the engine will not run after it is shut off. TESTING Insert the positive (+) lead of a voltmeter into the blue wire at the distributor connector and the negative (-) lead into the gray/white wire at the distributor connector. Do not unplug the distributor connector from the distributor. Insert the voltmeter leads into the back side of the connector to make contact with the terminals. Set the voltmeter on the 15 volt AC scale and turn the ignition switch ON. The voltmeter should read approximately 5 volts. If there is no voltage, check the voltmeter leads for a good connection. If there is still no voltage, remove the ECU and check for voltage at pin C-16 and ground with the harness connected. If there is still no voltage present, perform a vehicle test using tester M.S.1700, or equivalent. If voltage is present, check for continuity between the blue wire at the distributor connector and pin C-16 at the ECU. If there is no continuity, repair the wire harness as necessary. Check for continuity between the gray/white wire at the distributor connector and pin C-5 at the ECU. If there is no continuity, repair the wire harness as necessary. Check for continuity between the black wire at the distributor connector and ground. If there is no continuity, repair the wire harness as necessary. Crank the engine while observing the voltmeter; the needle should fluctuate back and forth while the engine is cranking. This verifies that the stator in the distributor is operating properly. If there is no sync pulse, stator replacement is necessary.

The Crankshaft Position Sensor (CKP) is secured by special shouldered bolts to the flywheel/drive plate housing. It is preset in its mounting at the factory and is non-adjustable in the field. The sensor senses TDC and engine speed by detecting the flywheel teeth as they pass during engine operation. The flywheel has a large trigger tooth and notch located 12 small teeth before each Top Dead Center (TDC) position. When a small tooth and notch pass the magnet core in the sensor, the concentration and then collapse of the magnetic flux induces a small voltage spike into the sensor pickup coil winding. These small voltage spikes enable the ECU to count the teeth as they pass the sensor. When a large trigger tooth and notch pass the magnet core in the sensor, the increased concentration/collapse of the magnetic flux induces a higher voltage spike into the pickup coil winding. This higher voltage spike indicates to the ECU that a piston will soon be at the TDC position 12 teeth later. The ignition timing for the cylinder is either advanced or retarded as necessary by the ECU according to the sensor inputs. TESTING Unplug the sensor connector from the ignition control module and connect an ohmmeter between terminals A and B as marked on the connector. The ohmmeter should read 125-275 ohms on a hot engine. Replace the sensor if the readings are not as stated.

I need some advice on changing the CKP sensor. I tried taking off the shift cable bracket, then used an 11mm wrench and an 11mm socket. I can get the bottom bolt out but the higher one is the problem. Is there any tips or specific tools i could use. I am going to buy a swivel socket and try that next. If there are any tricks out there I would really appreciate it. Thank You

Depends on type of Cherokee, below are replacement steps for the Jeep Cherokee Classic

could you please tell me steps required to replace the crankshaft position sensor in the 1998 Jeep? Does the tranny have to be dropped a little to do this?

Service and Repair Crankshaft Position Sensor

Crankshaft Position Sensor

The crankshaft position sensor is mounted to the transmission bellhousing at the left/rear side of engine block. This engines have the sensor attached with two bolts. REMOVAL Some model/engine combinations may require removal of air cleaner tubes for access to sensor. Remove air cleaner tube(s) at throttle body (if necessary). Near rear of intake manifold, disconnect pigtail harness (electrical connector) from main electrical harness. Depending upon application, remove either sensor mounting bolts or nuts. Remove sensor. INSTALLATION Install sensor flush against opening in transmission housing. 2.5L engines equipped with automatic transmission: Install and tighten two sensor mounting nuts to 19 N.m (14 ft. lbs.) torque. Install and tighten two sensor mounting bolts to 19 N.m (14 ft. lbs.) torque. The two sensor mounting bolts are specially machined to correctly space unit to flywheel. Do not attempt to install any other bolts. Connect sensor pigtail harness electrical connector to main wiring harness. Install air cleaner tube to throttle body (if necessary). https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm