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  #1  
Old 09-02-2016, 10:57 PM
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2001 cel p0351

Have a 2001 GC with a 4.7, with over 200000 on the clock, for the past few months my cel has been on, done the key dance and code that came up was a P0351 a Ignition Coil A Primary/Secondary Circuit Malfunction, have swapped coils with #2 and code still stays at #1, have checked wiring and all seem s good no bad spot's. Even cleaned the ECM with some Electronics cleaner and let it dry . Have reset the cel by unhooking the battery, and code comes right back just after the engine is started.Engine seems to run good just a slight vibration at idle. Anyone with insight on this code?
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com

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  #2  
Old 09-03-2016, 03:31 AM
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Re: 2001 cel p0351

Quote:
Originally Posted by cerberus View Post
Have a 2001 GC with a 4.7, with over 200000 on the clock, for the past few months my cel has been on, done the key dance and code that came up was a P0351 a Ignition Coil A Primary/Secondary Circuit Malfunction, have swapped coils with #2 and code still stays at #1, have checked wiring and all seem s good no bad spot's. Even cleaned the ECM with some Electronics cleaner and let it dry . Have reset the cel by unhooking the battery, and code comes right back just after the engine is started.Engine seems to run good just a slight vibration at idle. Anyone with insight on this code?
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com
Ignition Coil A Primary/Secondary Circuit Malfunction

Read more at: https://www.obd-codes.com/p0351
Copyright OBD-Codes.com


Here is what I found so far; go to

http://www.autozone.com/ignition-tun...uestid=3093582

Which is the Autozone site for my '97 ZJ but should be a basic diagnostic diagram of the ignition system associated with the OBD2 error code P0351. The code is as you described it. If the computer is the problem it is the most expensive part to replace depending on whether you need to comply with California standards which as less expensive to replace the rebuilt computer ( factory programmed and all solder points are redone and the boards tested for accuracy for my 97 at about $189.00 After core exchange and $380 for a board set to Federal standards). There is an advisory that on my 97 the computer is mounted inside the passenger compartment to keep it clear from heat and under hood dirt. They suggest that the board is most likely the last component to breakdown because it is well protected. There are also no standards that Autozone has to easily diagnose the printed circuit board so the suggest checking each of the less costly components that can be checked by an inexpensive Volt Ohm meter. Each part works withing a range and if outside the test ohms or volts the less expensive part is the problem. Although more work the guide that is indicated in the Haynes manual will help diagnose the problem from the battery, distributor, crankshaft and camshaft reasons to a the coil and ignition computer.

It's still over 110 degrees here in the desert I think the parts and sensors are affordable and easily accessible on my 4.0L 4x4 XJ that I'll have to towed over to the Mechanic and let him run down the diagnostics. He's a good shop and if I can find the parts for less at Autozone he'll let me supply the parts he needs and warranty only his labor. It can be risky but it's about all I can afford to do without selling my "firstborn" (Just joking as I would sell my distant and disrespectful 42 year old son but never one of my four dogs).

Try changing the Autozone specs to match you vehicle and checking your ignition system.
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Old 09-04-2016, 08:48 AM
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Re: 2001 cel p0351

I would also swap the spark plug with an other cylinder and check for vacuum leak at the intake manifold.
But there is a good change that the problem is the PCM itself.
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Old 09-06-2016, 08:39 PM
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2001 cel p0351

Quote:
Originally Posted by Frango100 View Post
I would also swap the spark plug with an other cylinder and check for vacuum leak at the intake manifold.
But there is a good change that the problem is the PCM itself.


If you allow your battery to discharge (for example by leaving your Jeep garaged in California's Palm Springs low desert cities without starting it during the summer's three hottest months) can the PCM lose its memory and cause the P0351 ignition coil error code? If so is it possible that the stalling, misfire or cranking and stalling or any failure to start be caused by the need to restore factory programming and not a damaged PCM? Can it be repaired by resetting or restoring factory settings?

If so, can the PROM be reprogrammed and if it can how is the PCM programming restored? Is the PROM chip removable and user replaceable? I've done something similar when I purchased and built my office computers from parts. I'd purchase a motherboard and install the processor and memory I wanted and add hard drive storage, video card, USB ports, audio processors, case and fans that we wanted.

As a musician, I still do the same thing using a laptop, iPad Tablet, foot pedal, effects and multitasking recording synthesizers.

Assuming the components on the PCM is not damaged, can the PROM be reprogrammed or reset to factory standards to save money? Does anyone have instructions that can guide me through the process?
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Old 09-07-2016, 06:53 AM
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Re: 2001 cel p0351

The PCM has a volatile and a non-volatile memory. The non-volatile memory has the base settings in it and should keep this info also when power is removed (battery disconnected).
The volatile memory keeps for example the fuel trim settings and the idle stepper motor setting, which will be errased when the battery is disconnected. So in principle there should be no reason for the fault code you have to show up after discharging the battery. It would be wise though, when you donīt use your car for longer then a month, to put a battery charger on it. There are automatic chargers which you can keep connected and keep the battery fully charged all the time. A fully charged battery will discharge on its own, even when its not connected, and after one month its probably at 50%. Higher temperatures will even discharge it quicker. A discharged battery will get damaged soon and will loose its capacity. And when the battery is connected, several memories of computers (PCM, BCM, clock etc) will continue working and draw a small current all the time, slowly draining your battery.
A PCM can be repaired, but most probably not at home. You will need to have the knowledge and test equipment to be able to know which component is faulty and also the programming needs specialized equipment and ofcourse the program itself. There are repair shops who can do this for you.You can also look for a used PCM (junk yard or e-bay), but still the programming must be done (your vehicle VIN and SKIM code must be programmed)
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Old 09-15-2016, 04:20 PM
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Re: 2001 cel p0351

Been out chasing a short in the 2001 Cherokee, I think I may have found the culprit, to my code PO351, at the #1 coil when engine is running and probing from the back of the coil, the green wire with strip will light up , and when probing from the back on the brownish wire with a pink strip it lights up no flicker,when checking the other coils the same way the light colored wire will flicker and the green wire is lit,now checking the wires from coil 1 in different place's along the wiring harness I get the same results, went to the ECM and on the plug closest to engine I probe the wires in the connector with the same results, So I'm thinking the ECM is bad or at least the part that controls the #1 coil. All other coils test good. What are your thoughts on this
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Old 09-16-2016, 09:54 AM
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Re: 2001 cel p0351

The green wire with the orange stripe is the power wire and should show 12V. The Tan wire with red stripe is the side going to the driver in the PCM. That the power on the Tan wire is constant, shows that the PCM driver is not functioning. I didnīt go through the previous history again, but when you measured the continuity of this wire from the coil plug to the PCM plug (and checked the connectors themselves as well, for pushed back pins or moisture/corrosion on pins) and all is well there, you can safely say that the driver in the PCM is the problem.
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