Multiple cylinders have no injector pulse

Phillip Diagnostician Alaska Posted   Latest  
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Driveability
2013 Dodge Charger R/T 5.7L (T EZH) 5-spd (NAG1) — 2C3CDXDT8DH584765
P0300 — Random/Multiple Cylinder Misfire Detected
P2107 — Throttle Actuator "A" Control Module Processor
P0201-13 — Cylinder 1 Injector "A" Circuit — Circuit Open
P0202-13 — Cylinder 2 Injector "A" Circuit — Circuit Open
P0203-13 — Cylinder 3 Injector "A" Circuit — Circuit Open
P0204-13 — Cylinder 4 Injector "A" Circuit — Circuit Open
P0205-13 — Cylinder 5 Injector "A" Circuit — Circuit Open
P0206-13 — Cylinder 6 Injector "A" Circuit — Circuit Open
P0207-13 — Cylinder 7 Injector "A" Circuit — Circuit Open
P0208-13 — Cylinder 8 Injector "A" Circuit — Circuit Open
Runs Very Poorly

So I was given this vehicle after a PCM from falgship one was installed and didn't fix the problem. (Note I did not tell them to install a PCM from there I will not do business with them cause 3-5 PCMs their is something wrong with them.) Their are multiple cylinders misfiring. I focused on cylinder #3 & #5. I found that the injector pulse MS was 0 in the PCM data. Sometimes I would get a pulse reading. I confirmed this via lab scope at the injector #3 & #4. I gained access to the PCM to verify that the PCM was not firing the injectors and indeed it was not. I was able to very battery voltage getting to the PCM indicating wiring was good up until the connector. I then supplied the injector control wires with ground and used my handy dandy headlight to make sure the system could support 5 amps. I then checked cam and crank correlation and found them to be pretty much on the money. At this point I load tested all the voltages and ground at the PCM and all good there. I am at the point were I am ready to call a PCM again. But I thought it be a good idea to maybe get some second thoughts. I was concerned with the fact I can see 0MS on the injector pulse form the PCM data. But I have not found a reason for why the PCM would shut off injectors unless it is not seeing a voltage supply from the injector. 

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Interesting
Unprofessional
Joel Mechanic
California
Joel
 

Have you checked at the pcm to see if the pcm is actually grounding out the circuit?

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Phillip Diagnostician
Alaska
Phillip
 

Yes I stated that in my post. Checked at PCM and injector.

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Justin Technician
California
Justin
 

If you clear the codes what codes occur immediately . Also what does the cam sensor signal look like on a scope ?? please Post the codes in order they appear on scan tool . Also what scan tool are you using ? . I will say that this model year is very sensitive to EMI and RFI so look for anything on the labscope when checking injector pulse and post pics or screenshots . I would hate to see cheap…

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Phillip Diagnostician
Alaska
Phillip
 

Same codes come back as soon as the car starts. They are active codes also. Only new code is P0300. Misfires as soon as vehicle starts . Signals look good. Nothing out of the ordinary. Using Autel and launch. But mostly Autel. IDK what you mean about PCM rebuilt or exchange. Another PCM was put in the vehicle from flag ship one and they are junk. I been burnt by them soo many times in last…

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Justin Technician
California
Justin
 

Work on these everyday and I can say that my gut is pcm but the what’s causing repeated pcm failures is the hard part . Throttle code makes me wonder about asd drop out .

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Phillip Diagnostician
Alaska
Phillip
 

Well the ignition coil is actually a good idea. So I want to make sure I have checked everything before I call the PCM.

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Justin Technician
California
Justin
 

Also disconnect the battery and unplug every coil connector and injector connector . Next set meter to ohms and black lead on ground . Positive lead at each injector driver wire with basically pcm plugged in but no injectors / coils plugged in and post resistance readings if you have time . I lately have been looking at driver resistance because it’s one way I have found to compare non…

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Jesse Owner/Technician
Pennsylvania
Jesse
 

It looks like you have done a very thorough job in covering proper Diagnostics What is slight chance that the p2107 could be causing the problem as in shared internal pathway the engine running but very poorly would seem to me like the computer is randomly shutting off circuits

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Alberto Mechanic
Florida
Alberto
   

Hi, that sounds like a throttle body failure too. Knowing that throttle angle is one of the inputs that the pcm look at to know how it's gonna pulse the In jectors, I would chk the throttle PID 's in the pcm datastream to see if they are all within spec. Then proceed to circuit testing If neccesary.

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Phillip Diagnostician
Alaska
Phillip Update
 

So I got the cam/crank waveform. I also got the primary ignition for #1 and #5. #5 had no injection pulse. The captures were taken at the fuel injector and ignition coil. You will have to forgive me I thought I had captured the #1 injector but apprently I didn't. It will be a day or two before I can get back to the vehicle and get a capture if needed.

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Justin Technician
California
Justin
 

Why walk away fro this gravy job !!

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Kerry Mobile Technician
Ohio
Kerry
 

Pretty sure these will turn injector off (cat saving strategy) if seeing problem with coil ionization on a specific cylinder....might want to check injector pulse immediately upon startup after clearing codes or resetting things.

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Phillip Diagnostician
Alaska
Phillip
 

Codes return right away and never have injector pulse.

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Kerry Mobile Technician
Ohio
Kerry
 

But you have to restart the car right?

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Phillip Diagnostician
Alaska
Phillip
 

So If I erase the codes and cycle the key. The injector codes will stay cleared till I start the vehicle. They will then come back as active codes. Every once and a while the throttle body code will not set right away. If I don't clear the codes and cycle the key the codes will be pending. The vehicle never has injector pulse on #3, #5, #8 and one other cylinder. I can't remember at this time…

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Bob Technician
Massachusetts
Bob
 

Phillip, If I understand the issue, the engine runs even though it sets codes for every injector circuit? Only some cylinders misfire? If some of the injectors are firing even though they set codes I would think there is a problem with the comparator circuits in the ECM. Externally the injector circuits could be OPEN, Shorted to ground, Shorted to voltage or High resistance. If all that checks…

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Phillip Diagnostician
Alaska
Phillip
 

The injectors are definitely not open nor do I have a shorted to voltage on the control wire. If unplug the injector then voltage goes away at the PCM. It is possible the injector is shorted. Which I will now test. Cause even if it is a PCM that could kill the next one. I will probably test the throttle body and the circuit for it Monday or Tuesday. If that all checks out I will call the PCM…

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