Question about 1999 Jeep Grand Cherokee

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My '99 Jeep Grand Cherokee Laredo 4.0 vin S 6 Cyl. will not stay running. The fuel pressure is good, Cam Shaft Sensor, Coil, Crank Shaft Sensor and Spark Plugs. I get 3 codes when I do the Ignition Code Test, P0353, P0352 and P0351. Can you tell me how to fix this? The definitions that I get are Ignition Coil #1 Primary Circuit, Peak Primary Circuit current not acheived with maximum dwell time. Not sure what that means either.

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  • Addie Birch
    Addie Birch Mar 05, 2009

    I did not recalibrate the Cam Sensor. I did end up sending it to a dealer, due to all the tests pointing towards PCM Replacement. The dealer had found the the Oil Pick Up Gear was locking up and caused the Crankshaft Sensor to continue to go bad. Both parts replaced and vehicle runs fine now. Thanks to all who gave advise, I do appreciate it.



    Thanks,

    Addie

  • Richard Scordino May 11, 2010

    The shop diagnosis makes little sense, however the bottom line is that they did something and now it/s OK. That is a good thing!!!
    Good luck with it!!


  • Richard Scordino May 11, 2010

    First, I would check the charging system to make sure it is operating correctly and that battery is fully charged. Next, check actual volts at the coil primary lead (if insufficient, it may generate those codes). Other than that, did you recalibrate the cam sensor after replacing it?

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  • Jeep Master
  • 1,171 Answers

Check the fire at the spark plug end of the coil wires. Sounds to me like you have bad coils or coil wires.

Posted on Jul 10, 2017

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Posted on Jan 02, 2017

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  • 750 Answers

SOURCE: 2003 vw jetta gl 2.0 have codes p0351,p0352 and p0353

p0351- ignition coil A primary or secondary fault
p0352- ,, ,,,,,, ,,,,, B ,,,,, ,,,,,,, ,,,,,,,,,,,,, ,,,,,
p0353 - ,,,,,,,,,,,,, C,,,,,,,,,,,,,, ,,,, .,,,,,,,,,,,,,,,,
you may have a problem with yuor ingnition system

Posted on Sep 30, 2009

  • 1 Answer

SOURCE: 1996 jeep Grand Cherokee has a scan code P0351.It says

Wiggle the connectors on the PCM during those four or five minutes...
I'm going to try the hose clamp fix myself. I have been struggling with stalling for about a month now. As a matter of fact, my PCM looks just like the one with the hose clamp. Connector C1 (black) missing the locking tab. I have tried the screw repair and zip ties. Zip ties worked for about a week and then I had a hiccup followed two days later by a full blown stall. Now it's stalling about 4 to 6 times in a one way trip to work (11 miles).
I was able to procure a clamp tonight and got it installed. When I go home we'll see. I was throwing a P0351 code with a code 43. This is an aggravating fault to be sure. I am an aircraft electrician by trade so and thanks to the volumes of people who have had this problem I have been able to do some really good fault isolation.
It exists either in the C1 connector for me or the PCM. Initially I changed the TPS and then found found C1 ready to fall off the PCM (Thus the zip ties).
Later I found that even though zip tied wiggling the harness could duplicate the fault. So another zip tie around the harness to pull tension on the connector. The fault returned. I also took a rubber mallet to the computer while the engine is running and duplicated the fault as well.
At this point I'll try the hose clamp and see how that works out. Either I don't have a good connection on C1 or the male pin 7 in the computer is a problem. Since I have an obvious defect in the locking tab on the C1 connector I'm swaying towards that. I want to talk a little system knowledge here courtesy of a guy who posted on CNet.
1. P0351 is a coil code. However:
a. The coil receives a signal from the PCM connector C1 Pin 7 to "fire".
b. There are only two wires at the coil, signal wire from the PCM pin 7 and a ground wire.
c. In order for the PCM to throw code P0351 the PCM had to fail to send the proper fire signal. Of course this assumes that you have a known good coil, clean ground and no breaks in your wiring.

2. A multimeter checks continuity not integrity. The average 18 gauge wire has 22 individual copper conductors(wires) inside the insulation. You can have 21 broken strands and still read full continuity through that single strand of wire. But that single strand of wire will not be able to handle the signal being sent to the coil (load). A load light will always check integrity AND continuity. A weak light means not enough current going through the wire and a strong light means good wire integrity.
3. So with this said, In order for P0351 to set, the computer has to give an erroneous signal to fire. Pin 7 is an OUTPUT. Now is this caused by a bad computer? Possible. A bad connection? More likely.

Let's face it computers will fail, but in my 22 years of electrical experience bad/loose/dirty connection points are the weakest link. A cold solder joint on the PC board in the computer? Yes, however this will generally show up shortly after the vehicle rolls off the assmbly line. Not 13 years later!
As for the "screw" fix. I read a post from an engineer who scraped all the resin out of the PCM to see what was on the board. The long screws go to a NYLON nut on the board. But does not come near the current path of the PC board.

Posted on Jan 23, 2011

  • 599 Answers

SOURCE: codes p0340 p0353 p0352 p0351 p1391

Kevin, can you give me a little more to work with? I would like year, make and model of your vehicle along with any other symtoms you may have experienced. Please get back to me with this information, and don't start replacing parts that you may not need. Waiting on your response.

Posted on Oct 19, 2011

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