This must be a "one coil per plug" setup.PO351,352,353 are codes for coil A,B,C in that order.(I'm guessing cylinders 1,2,3?)Clear the codes,mark the suspect coils,and swap them to different cylinders,and see if new codes(different numbers) come up.
SOURCE: cranks but won't start
Trouble Code: P0300
Multiple Cylinder Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or EVAP system
Base engine mechanical fault that affects two or more cylinders
Erratic or interrupted CKP or CMP Sensor signals
Fuel delivery component fault that affects two or more cylinders (i.e., a contaminated, dirty or sticking fuel injector)
Trouble Code: P0302
Cylinder 1-10 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or EVAP system
Base engine mechanical fault that affects only one cylinder
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
Trouble Code: P0305
Cylinder 1-10 Misfire Detected
Possible Causes:
Air leak in the intake manifold, or in the EGR or EVAP system
Base engine mechanical fault that affects only one cylinder
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
Trouble Code: P0351
Ignition Coil No. 1, 2 or 3 Primary Circuit
Possible Causes:
ASD relay power circuit to the ignition coil is open
Ignition Coil No. 1, 2 or 3 primary "driver" circuit open or grounded
Ignition Coil No. 1, 2 or 3 is damaged or it has failed
Trouble Code: P0352
Ignition Coil No. 1-8 Primary Circuit
Possible Causes:
ASD relay power circuit to the ignition coil is open
Ignition coil primary "driver" circuit open or grounded
Trouble Code: P0353
Ignition Coil No. 1-8 Primary Circuit
Possible Causes:
ASD relay power circuit to the ignition coil is open
Ignition coil primary "driver" circuit open or grounded
Ignition coil is damaged or it has failed
PCM has failed Ignition coil is damaged or it has failed
PCM has failedPCM has failed
Ignition system problem (coil or plug) in only one cylinder
Ignition system problem (coil or plug) in only one cylinder
Ignition system problem (coil or plug) in two or more cylinders
Vehicle driven with low fuel pressure or while very low on fuel
SOURCE: codes p0351, p0352, p0353 and
obdii-code-p0351-x2-704058/index4.html">http://www.jeepforum.com/forum/f13/help-obdii-code-p0351-x2-704058/index4.html
This thread basically says replace the crank position sensor and the cam position sensor. Check the wiring for the Oxy sensor(s). And if all else fails then change the PCM.
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I trying to find the problem and it is hard so you could help me out
map out the circuit. see how many components share the same wire in connectivity? now check for that common wire being shorted to grnd. unplug components till the ohm reading becomes infinite from that wire to grnd. this tells us what components are shorted. this also makes us inspect the condition of the wires and connectors. we can find any place it is cooked, chafed burnt, or just being shorted by the failed component(s). we can add in or subtract components while we refer to the schematic. you may have to get the dealer update and print 3 pages. then tape them together making a poster like picture. once the failed components are identified, they must be replaced with dealership quality parts. (Crown) is the jeep manufacturer
when we have verified all the components are receiving power, ground, signal wires undaunted and not according to their unabated operation, we can turn our sights on the PCM. its drivers create the constant check, the switched power , or the switched ground. a pinout check of the harness is in order prior to condemming the PCM. using aftermarket sensors, actuators or pcm's can lead to repeat failure, excessive cost, and loss of the whole unit in a junkyard. I went one day to look. there were 8 of them there. they were all in clean repairable condition. they all had substandard repairs previously performed which lead to them being unable to start or run effectively !
when i say " dealer update" i mean the corrected schematic. the corrected pinout charts, and the testing procedures. i find them at the public library. 10c apage to print. Mitchell manual database is offered for free at our public library in pierce co. wa. your mileage may vary.
update all your sensors once you get it to start. even the manufacturers of these components will tell you they dont last forever updated parts are commonly put in when theres warranty coverage, by the most successful driveability technicians . we have concern here on this year/make/ model of sensors causing problems and the pcm unable to define the cause in a way thats simple or decisive. (It doesn't tell on itself )
i personally have found sensors fouled, by the fuel thats available for sale in our area while complying with regulation. during certain times and climactic changes, all we can sometimes get is fuel that has been treated to reduce emissions. i have also seen sensors externally damaged by coolant. damaged by corrosion, engine compartment heat, vibration. think of 100k as the useable life expectancy of these parts. Then theres the exhaust heat and its effect on the wire harness. hardening and splitting open has been found on the harness behind the engine and along the firewall
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