6 cyl sport model cranks but want start. fuel pump runs when jumped out , coil rail resistance values are within parameters.changed spark plugs, checked wiring ,plug connectors etc." no bus" read out on inst cluster . hooked scanner to obd 2 port and got a "no link" reading. also have a key symbol with a circle and slash thru it on inst cluster . what checks can i do to narrow down the cause. looking for tech info to help . I am thinking possible computer or skim module are transponder ring or the key etc HELP PLEASE
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Re: 2001 jeep cherokee want start
With the key on and drivers door open, disconnect the crankshaft position sensor. You may hear the chimes, buzzers and other things come to life. Check your cluster to see if the gauges are reading normal again. If all that happens, replace the crankshaft position sensor. If nothing happens, continue disconnecting other engine control sensors. I've seen this problem on the 4.7 and 4.0 engines and it has always been the crank sensor pulling the communication bus down. Without the bus the modules can't communicate with each other, so without an "ok to start" signal the PCM won't allow the vehicle to start. I hope this helps.
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It suggest checking the fuse and relay to the fuel pump. You might consider changing the coil. on a 6 cyl 4.0 or 4.7 the replacement part at PEP Boys should be E 239 BDW. About $130.00 bucks. Good luck Vicky.
TO REPLACE SPARK PLUGS YOU REMOVE COIL PACK MOUNTING BOLTS THEN REMOVE THE COIL PACK WITH BOOT OVER THE SPARK PLUG.YOU HAVE 6 INDIVIDUAL COIL PACK TO EACH CYLINDER. YOU NEED A 3/8 RATCHET WRENCH - LONG 3/8 EXTENSION -SPARK PLUG SOCKET - SPARK PLUG GAUGE.AND TORQUE WRENCH.THE 2000 MODEL JEEPS FUEL FILTER INSIDE THE TANK.1993 - 1996 MODEL JEEPS FUEL FILTER LOCATED LEFT SIDE OF THE VECHICLE NEAR THE FUEL TANK.
The coil pack is most likely the problem for the miss fire on the cylinder,but the engine most of the time will still run,just poorly.Crank shaft sensor would be the next thing to check,if there is fuel pressure present at the fuel rail.Also enough fuel pressure.
Bad solenoid i would guess. Not making a connection there. Any basic wiring and ignition switch problems should be alleviated by jumping the starter with a screwdriver. I would check the solenoid and starter brushes
First of all, the fuel pump is generally located in the fuel tank, not always though. Yours probably is, in did not research it. The fuel electric fuel pump turns on only when the ignition key switch is turned to the start position and then left on. A series of one or two relays along with a pressure monitor in the fuel rail delivery system may or not cycle it on and off depending on design. Enough of that. I suggest that you remove the spark plugs to see if they are oil/heavy cabon deposits.If so, professional attention is reguired. One more thing you could try is replacing the spark plug wires. the may be old/worn out/damage. This would give the engine spark a stronger spark,if worn and also replace the spark plugs.
If the data link is not talking to the computer check your ground at the computer and at the data link connector to see if the computer is even alive ground pin 3 on DLC with the key off then turn key to the run position if it flashes the check engine codes record them, if no engine light, does the engine light come on when you turn the key on then go off? if not, check fuses if not check power for pin on computer, if it has power you have a bad computer. But TEST THE GROUNDS IT IS THE BIGGEST FAILURE For these rigs or any manufacture. check that you have power also at the DLC too. if not you need a digital ohm meter and a subscription to http:///.www.alldatadiy.com and start reading the campaigns on that vechile for computer and trouble tree for dead DLC and computer. I don't have that subscription or I could tell you more where to look, if you need anymore help let me know. Also if the crank sensor could cause it not to run the fuel pump but so can the cam sensor. You need to find out if the computer gets it's pulse for the pump at the computer if it does then you need to test them both. There are three wires a ground a colored power wire and a wire to go to the computer you can test these sensors with a meter to see if there is a pulse to each. sometimes the fuel pump gets it's signal from the coil pack so it's important to have the subscription, you can do a search for each item and test them as needed and has a wiring diagram.
Are you getting spark from coil wire when cranking? If so, check the cap & rotor. If not, the most common failure is the crank sensor. If you have a 4,0, you can find it on the drivers side of the bellhousing, in line with the flywheel, just where it's annoying to work on. There is a test you can make, but I don't have the specific test values or the correct terminals to check. (you can find that info in any half decent manual. Good luck