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Your starter does not actually start your car. It's only job is to turn the engine so it can start. (actually replaces the crank people used to need to put into the front of the car and physically crank (turn) the engine...hence the term "cranking") The two most common causes of the problem you are having is either the crank position sensor or fuel pump has failed. Easy way to determine if the pump is bad is to listen to the gas tank when you turn the key to the "on" position...You should be able to hear it. CPS needs to be checked with a digital ohmmeter Best instructions for electrical testing can be found in chilton manuals available in most large parts stores. Haynes is somewhat useful but a bit too basic for any real electrical diagnosis. All sensors are expensive (min of $90 each) so testing is important so you don't end up throwing $ at it with no results. Need answers to anything you find just ask!!.
It's located near the transmission and engine, where they meet. Under the vehicle, driverside. It;s easy to replace and takes like 5 min. Your Jeep must be cutting off. If you can't find it let me know, and I have a manual on the Jeep, I will scan the picture and info, and send it to you through here or e-mail.
You don't have one. The pump runs from the relay in the power distribution center (Box near the battery with relays and fuses)and gets it's signal from the computer that is reacting to information it gets from the crank sensor and other sensors. If the computer sees no signal from the crank sensor it turns everything off by way of the auto shutdown relay (also in the distribution center)
The P1391 code indicates that the crank or cam sensor(s) have sent an intermitant code to the ecm. The most common cause for this is loose wiring or debris on the contacts of one of the sensors.
The crank posistion sensor is located on the top of the transmission bell housing right next to the motor, its a @$^&^ to get to and do without a lift,
The sensor is mounted in a fixed position in the engine block. The tip
of the sensor protrudes into the crankcase at a distance of 0.05 plus
or minus 0.02 inch from the crankshaft.
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