Review for Jeep Liberty China Ignition Coil Set

P0351 is a generic OBD II trouble code, which ways that it means the same matter for the Jeep Liberty every bit it would any other vehicle.  It indicates that ignition coil "A" is malfunctioning.  It is typically caused past a bad coil pack or wiring harness issue, although at that place can exist other causes as well.

The master wiring is the wiring harness leading from your Freedom's ECM/PCM to the ignition organization itself. A brusk, open up, or poorly ground wiring harness is almost always what causes P0351 when it is the main wiring side that has thrown the code.

The secondary side of the equation is the spark side.  Which ways that plugs, plug wires (if and then equipped) or the spark plug itself is causing your Liberty to throw P0351.  Ignition Roll "A" indicates the trouble is in cylinder i.  You'll need to look up which cylinder is number ane on your engine.  Different manufacturers use different methods.  Here's a pretty expert explanation of how how to locate cylinder one.

There is a really easy test to decide if information technology is the chief or secondary wiring that has thrown this code in your Freedom.  You motility the ignition components (coil pack, plug wire, plug) from one cylinder to another, and articulate the codes.  If the code "moves" you know that information technology's a secondary issue.  If information technology stays, information technology'due south a primary.  We go into this in greater particular below.

P0351 Symptoms:  Jeep Liberty

• Check Engine Calorie-free– The check engine light may be all that y'all observe when you have this lawmaking, particularly if information technology is caused by an intermittent wiring issue with your Liberty.
• Misfiring– P0351 might be accompanied by P0301.  P0301 indicates that in that location is a misfire in cylinder 1.  Resolving P0351 will typically clear P0301.  Misfiring tin lead to a lack of power, and/or engine hesitation.
• Rough Idle– You vehicle may idle crude if cylinder one isn't getting enough spark.  You lot very well may odour raw fuel as your Liberty's engine runs every bit well.

P0351 Causes:  Jeep Liberty

• Wiring Bug (short, open up, or bad ground)
• Bad Coil Pack
• Loose Connexion at the gyre
• Bad PCM

Diagnosis

Voltage Test (Optional, but fourth dimension saving)

The beginning place that yous would desire to beginning looking for what could exist causing P0351 in your vehicle would be the wiring harness.  You tin can utilise a digital voltmeter to cheque if the coil pack is getting the proper signal.  You would want to set up it for A/C hertz and cheque to see if information technology is between v-20hz.

If it was between 5-20hz, it'due south highly likely that the coil pack has gone bad.  Although, it could as well be a bad plug or plug wire too.  If it has no point, it's time to look at the wiring harness.  If yous don't have a voltmeter, you can use the parts swap method to help you determine if it'due south the main or secondary side causing your bug.  Meet straight below ↓.

Parts Swap

A great mode to determine if information technology is an ignition related component, and not a wiring consequence, is to reset the problem code and swap the coil, plug, and plug wire (if equipped) with another cylinder.  If the misfire jumps to the cylinder that y'all've only swapped your Liberty'south ignition components into, and then y'all know that you are looking at is a coil, plug wire, or (virtually likely) coil pack failure.

If the misfire did move cylinders, you can go ahead and supervene upon the plug, plug wire, and curl pack.  If you are on a tight budget, y'all can keep resetting the lawmaking and swap the ignition parts dorsum i at a time until the misfire returns to cylinder one.  Start with the whorl pack.

Wiring

If the misfire failed to movement from cylinder one, so y'all know that you most probable have an issue with the wiring harness going from the ringlet pack to the Freedom's PCM.  Take a look at where the harness plugs into the coil pack.  Is information technology damaged or loose feeling in relation to the other cylinder's connections?  If so it may demand to exist replaced.

If the misfire is intermittent, go alee and jiggle the wiring harness and encounter if information technology has an bear upon on the way the engine is running.  If it does start or finish misfiring, you know you've found your problem.  Expect anywhere that the harness bends or touches anything abrupt.  Await to encounter if it looks burnt anywhere.  Check for damage and repair the wiring accordingly.

Make sure that it has a solid ground.

PCM/ECM

If y'all all the same can't detect the trouble, information technology'due south fourth dimension to have a look at the PCM.  This is the to the lowest degree likely answer, and an surface area where information technology may be time to call in the pro'southward.

Conclusion:  P0351 Jeep Freedom

P0351 is ordinarily pretty easy to diagnose through the swap exam, even if you don't take whatever specialty diagnostic tools.  If in that location is annihilation you can add, delight leave a annotate below.  Practiced luck fixing your Freedom!

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Source: https://www.700r4transmissionhq.com/p0351-jeep-liberty/

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