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Shut off the engine, open the hood, and let the engine cool down for one to two hours to avoid any burns.

Shine a work light on the back side of the engine block, where the engine meets the transmission bell housing. Locate the crankshaft position sensor. It is set into the engine block near the upper left corner of the transmission bell housing. Disconnect the sensors electrical connector and remove the bolt holding the sensor to the block with a ratchet and metric socket.

Remove the sensor by pulling on it while twisting it back and forth. Once the sensor pops out, dry it with a clean shop rag. Inspect the sensor for cracks or chipping. Replace the sensor if you find any crack or chips.

Set your digital multimeter to Ohms or resistance. Use the two multimeter probes to measure resistance across the crankshaft position sensor terminals. The specified value is 166.5 to 203.5 Ohms at 68 degrees Fahrenheit. If the sensors resistance falls outside this value then it is faulty and needs to be replaced.

Visually inspect the crankshaft position sensors wiring harness on the vehicle. Look for bare spots on the wires and chips or cracks on the plastic connector. Insert a small flat-head screwdriver into the metal connector pins and wiggle the screwdriver back and forth. The pins should remain in position and should not be loose. Inspect the pins for excess corrosion or damage. If any of these conditions exist, replace the crankshaft position sensors wiring harness.

Turn on the ignition and set your digital multimeter to "DC Volts." Probe the light blue wire on the crankshaft position sensors electrical connector with the red multimeter probe. Ground the black multimeter probe and look at the voltage reading. The reading should be between 2 and 12-volts. If the value is out of this range then the sensor is not receiving power, and youll need to troubleshoot the engine wiring harness. Connect a test lamp to the positive battery terminal and probe the ground side of the crankshaft position sensor. If the test lamp doesnt illuminate, then the ground is bad and youll need to troubleshoot the engine wiring harness.

Raise the front of your Jeep with a jack and position a set of jack stands under the front axle to support it. Lower the jack, allowing the Jeep to rest solidly on the jack stands.

Locate the crank position sensor in the bell housing of the Jeep from under the drivers side. Locate and remove the two retaining bolts that secure the sensor to the bell housing, using a socket and ratchet.

Follow the wire from the sensor to the connector on the engine. Release the lock on the connector and separate the sensor wiring harness from the engine wiring harness. Remove the sensor and harness from the Jeep and discard it.

Position the new sensor on the bell housing and install the two retaining bolts. Tighten the bolts with a socket and ratchet until they are snug. Do not over-tighten these bolts or you will strip the threads out of the aluminum bell housing.

Route the wiring harness from the sensor to the engine wiring harness and push the two connectors together until the locking tab snaps in place. Be sure to route the wiring harness away from sharp edges or heat sources.

Raise the front of the Jeep off the jack stands with a jack then remove the stands from under the truck. Lower the jack and test the repair by starting the truck and verifying that it runs properly.