2007 Dodge Caravan POS 3.3 V6 - P0202 & P0302 Misfire & Electrical Diagnostics

In this video I get a very interesting vehicle that seems to have been very problematic for this customer as they have unloaded the parts cannon and were unable to successfully troubleshoot this vehicle for 2 weeks now and decided to bring it in to me to have a look at. The main issue is that it has a misfire that doesn't seem to go away after the parts have been replaced by the customer. This vehicle is an excellent example of a good case study in which I will bring you guys along in order to show you how to properly diagnose and fix this vehicle. Please have some chips and/or popcorn ready as this video is nearly an hour long.
Apparently, after I fixed the vehicle and the customer paid their bill they stated that they were an "electrical engineer" and so I don't understand as to why they couldn't fix the vehicle themselves then. I've always got the I am an "electrical engineer" quote/saying about a dozen times or so in my automotive career in which these people/customers were electrical engineers, but could not fix their own electrical problems, but instead brought the vehicles to me to fix.
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[@miltongina]

Great Video, my 2002 Grand Dodge Caravan 3.3L V6 with 173300 miles had a P0206 code. I first started changing the injector 6 but that did not work, then decided to change all six injectors but still P0206, changed the wires harness injectors but the same thing, swap on good one but still the same, then I use my multimeter to check Volts and Ohms, The volts on the connectors were all 12.4 volts and Ohms were 1.28/12.8. After reading for a while I decided it was the PCM, when I removed the harness from the PCM I saw Black Liquid fluid on the PCM Pins and bottom part, so I thought it was probably the problem, did not do anymore testing, Bought a Refurbish PCM Plug and Play on eBay, When I received replaced it and the problem went away, the Drivers of the Fuel Injectors was not working on the 6 injector cause the other 5 were, so you check this, first look inside your PCM connectors, check pulse on injector (use long screwdriver for pulse), check Volts and Ohs, change wire harness injector (optional) and come to a conclusion, in my case it was the PCM/ECM gone bad. I Hope this Helps, in all the cases its not the same problem but its a start. It could be even a break on one of the wires on the engine.

[@moosemobileautorepair]

Thanks for the information! Also, I know that sometimes some new or refurbished PCMs can also be faulty and have bad injector/ignition driver circuits not work properly and make you second guess your diagnostics, when really it is just a defective computer. Doesn't normally happen, but I have seen that happen to some people before. All in all good info, thanks.

[@miltongina]

Thanks but I know next time I will start with the PCM/ECM.

[@devinknutson1052]

Great video. A little bit long but that's how it goes doing diagnostics. Lots of awesome information.

[@moosemobileautorepair]

Glad you enjoyed it!

[@davidherndon1]

I hope you got paid royally. You should be working for a high end place. You have the electric diagnostic skills!

[@moosemobileautorepair]

Thanks. I appreciate that. I billed around 3 hours, but should have billed a tiny bit more. The customer really gave me a hard time for nothing. I'm good at what I do, but I just don't get enough of these kind of electrical problems/work to do to show and film.

[@mixmediaproductions]

0202 is the injector so, check those wires and the injection pulse.. or throw new on it. I think they are $57 each. Plug gap, and full set of wires with new plugs. Set time.. reset. Codes and see about transmission..

[@moosemobileautorepair]

I don't think you watched the entire video. A trouble code doesn't tell you what the problem is, but rather the area of the problem. The customer had already fired the parts cannon and replaced a bunch of parts including a new fuel injector and some spark plugs and spark/ignition wires as they had trouble replacing them. The wiring at the injector was fine. The issue ended up being a wiring problem shorting out against the back of the alternator. The wires were still good just needed to be moved away. The alternator's back plastic casing insulation was damaged, but the customer did not want me to replace the alternator so just securing and covering up the wires with some wire loom/electrical tape solves the problem.

[@RonnieCalhoun]

check each wire at the coil and see if they have an ark

[@jmac4952]

Super thorough. Excellent work!