Bad Ignition coil - testing?

Hello,

Direct Trouble Code [DTC] P0301 is a DTC for cylinder 1 misfiring. It is usually caused by a bad coil on plug [COP], bad spark plug, or bad fuel injector. Also you should inspect the wiring on the fuel injector or the COP and the electrical connector for unwanted resistance. In the diagrams down below I have included the Engine Management wiring diagrams for your vehicle along with guides on how to find opens in an automotive electrical circuit, and how to find unwanted resistance in an automotive electrical circuit using voltage drop. You will need to use a Digital Multi Meter [DMM] to use these guides, so here is a link below explaining how to use one, if needed:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

This guide can help as well

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please go through these guides and get back to us with what you find out.

Thanks,
Alex
2CarPros

Hi,

There are a number of things that can cause a misfire. See the attached pic. Also, take a look through this link and see if anything helps.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

With that, are you getting spark to the cylinder 1 spark plug? Have you checked fuel pressure?

Let me know what all was done so far and how you determine the coil is good.

Take care,

Joe

Chrysler deleted SB 18-079-16 from there files and I cannot find it. So they came out with a new bulletin that includes a new trouble code with the running rough condition. The symptoms is running rough and a warranty enhancement for a software upgrade for this condition. You will need to call Chrysler to see if it applies to your vehicle. Here is the bulletin and hope the info helps:
2013 Dodge Avenger

�

L4-2.4L

�

�

Flash: Power-train Diagnostic and System Enhancements

Vehicle� ALL Diagnostic Trouble Codes ( DTC )� Technical Service Bulletins� Flash: Power-train Diagnostic and System Enhancements

FLASH: POWER-TRAIN DIAGNOSTIC AND SYSTEM ENHANCEMENTS

NUMBER:

18-058-17

GROUP:

18 - Vehicle Performance

DATE:

June 14, 2017

THIS BULLETIN SUPERSEDES SERVICE BULLETIN 18-079-16, DATED JULY 18, 2016, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE A NEW DIAGNOSTIC TROUBLE CODE (DTC) FOR 2014 SALES CODE ED3, LOP AND UPDATED FAILURE CODE STATEMENT.

FOR HELP WITH USING wiTECH FOR ECU FLASH REPROGRAMMING, CLICK ON THE APPLICATION’S “HELP” TAB.

THE wiTECH SOFTWARE IS REQUIRED TO BE AT THE LATEST RELEASE BEFORE PERFORMING THIS PROCEDURE.

SUBJECT:

Flash: Power-train Diagnostic and System Enhancements

OVERVIEW:

This bulletin involves reprogramming the Power-train Control Module (PCM) with the latest available software.

MODELS:2013 - 2014(JS)Chrysler 200
Dodge Avenger

NOTE: This bulletin applies to vehicles equipped with a 2.4L I4 DOHC 16V Dual VVT Engine (Sales Code ED3), and a 6-Speed automatic transmission (Sales Code DG2).

NOTE: This bulletin applies to vehicles equipped with a 2.4L I4 PZEV 16V Dual VVT Engine(Sales Code EDG) equipped with a 6-Speed automatic transmission (Sales Code DG2) or equipped with a 4-Speed Automatic VLP Transmission (Sales Code DFF).

SYMPTOM/CONDITION:

**A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find the following DTC.

P0335 - Crankshaft Position Sensor Circuit (2014 MY Sales Code ED3).**

In addition, customers may experience any of the following:

Rough idle (Sales Code EDG).A Transmission Tip-In bump (Sales Code EDG). Hard to start in cold ambient temps. (Sales Code EDG). Engine idle cycling on cold start in gear. Slight engine surge driving at highway speeds. DIAGNOSIS:

Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all related systems are functioning as designed. If DTCs are present, record them on the repair order and repair as necessary before proceeding further with this bulletin.

For all other customers that describe the symptom/condition, or if the technician finds any of the DTCs perform the Repair Procedure.

REPAIR PROCEDURE:

NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.

NOTE: If this flash process is interrupted/aborted, the flash should be restarted.

Reprogram the PCM with the latest software. Detailed instructions for flashing control modules using the wiTECH Diagnostic Application are available by selecting the application’s "HELP" tab. Clear any DTCs that may have been set in any module due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow them to be cleared.

Okay, so you have a P0301 and you swapped the coil and it did or didn't follow where you put the coil? Reading your question suggests it did follow the coil and now that cylinder is missing? Or did you mean you moved the coil from #1 to say #2 and it still has the P0301 code and missing on #1? If it is the second one I would probably check the plugs especially if they haven't been changed in a while. Then use a noid light or a test light to check the injector.

Okay, so the misfire follows the coil but a new coil still misses when put on there. That would indicate that the coil was bad but it may have shorted the driver circuit in the PCM. You should have battery voltage on the Brown wire with Blue trace. That is fed from the same fuse as the other coils, but you could have a bad connector. Next would be to check for the driver signal, it is simply the PCM pulling the coil to ground and releasing it. The fastest way to test it would be a simple test light or noid light that will flash when connected in place of the coil. No flash would mean the transistor in the PCM has failed and you need a new PCM.

Posted specs below. Let us know if the information was helpful. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

Sorry, the dealer

Sometimes the manufacturer will only release certain parts to shops that do reman work, this may be one of those cases