Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Have a 2000 Dodge Dakota RT 5.9 having codes po203 po205 po206 keep popping up ejector malfunction all new injectors new fuel pump clean fuel lines new TPS new map sensors new spark plugs new spark plug wires new rotor cap new rotary button new ignition pickup coil no short and no wires truck runs like crap was driving down the road and started misfiring PCM is showing from a noid light that it is pulsing all injectors correctly just lost don't know if it's a bad PCM bought a remanufactured PCM same codes popped up no difference in running PCM from junkyard same thing went through every single wire unwrap them and do not have any shortages or breakage is at all everything is well man kept well organized and labeled is it possible that I just keep getting a bad PCM when I buy one?
Sometimes after I reset the codes one will pop up by itself then I could reset an in two of them will pop up by their selves and then I'll reset then one again and so forth the most I've ever got at one time was 3 but here lately the most I've been getting is one code and the codes again are po203 po205 po206
maybe try swapping those 3 injectors your having issues with to ones your not having issues with. thats if you dont have a scope to check injector pulse width.
As your codes refer to the injector circuits you may well have an issue with the wiring and/or connectors of the injectors.....load test the wires between injectors and pcm after disconnecting them, check for short to ground. ..... Measre the resistance of each injector....
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
I have still pin points the same 3,5,6 all injectors are bran new no grounding out on wires have been checked and checked with multimeter wire resistance are all passing I pulled fuel rail up while truck was running and clearly see that every fuel injector sprays very perfectly I almost feel like a PCM is lying to itself is that possible? It has to be a fuel problem because it smells like gas very badly white smoke and all we get like 2 miles down the road and it would be almost $10 in gas
Only way I've done that was with the truck off and I read the ohms how else should I do it? I did the scope test with it running and each injector seems to be firing and I also witnessed it myself by pulling the injector rail up while it was running little dangerous but I seen it what other way can I check the voltage is on it with a multimeter?
With a multimeter there are only few things more u can do, depending on your multimeter:
If you have min/max peak function you could compare the inductive peak voltages of the injectors. A frequency measurement may show possible drop outs of single cylinders.
An osciloscope would be the right tool to analyze injectors/circuits.
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
It is really the kind of fault where looking at the current and injector wave forms with a scope would be useful, however --
As Noid Lights really don't put enough load on to prove the wiring and driver good I think what I would be tempted to do is back pin the connector and put a low wattage tunsten test light in parallel with a misfiring injector this will slightly overload the injector driver slightly but injector drivers are tough and it should be okay for a short time.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
Okay I don't have the $7,000 scan tool the verus LOL I only have a multi-meter tool from Walmart and a test like in a OBD2 tester now I do know that every single wire to every injector is perfectly fine every injector is perfectly fine I really am confused about the situation I almost wish that you all could see what I'm talking about I feel like I got a bad PCM but what are the odds of my PCM being bad two times in a row I have went through every single wire nothing is sliced pinched grounding out or burnt
Every wire is getting good current through it the same current as any other injector that's another reason why I know the wires are not bad I got a remanufactured PCM off of eBay off of all Computer Exchange I also heard bad reviews on them but I also heard good reviews at the same time
I guess that's my only other option is to get a third PCM but I'm going to be really disappointed that that won't fix the problem either I literally can disconnect every injector besides 3 5 and 6 and it will run run like crap but it was still run any suggestions on where I could get a PCM at that would be reliable and not questionable
I'll discuss some points you may not like but it might help you as well....
If I understand correctly you got the same codes from the original pcm, then from a "rebuilt" pcm and from a junkyard one .It is HIGHLY unlikely to have 2 pcm giving you the exact same codes and malfunctions Think about that before throwing another pcm at it WITHOUT confirming the cause of the failure.
You will need the proper tooling to do a good job. Sometimes it can be a test light, sometimes you need something more sofisticated; in your case the latter seems to hold true. Yet you don't need a 7000$ tool to get by, there are scopes for less than a pcm (which may even not be necessary). Your list of items already changed to no avail is quite long and the parts weren't cheap either
If you don't feel like spending on tools you might or might not use anymore after repairing this vehicle you may consider taking the vehicle to a competent shop to get it diagnosed correctly before throwing even more parts on it.
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Thanks what other tools could i use that you know of.? (I don't really want to throw another PCM in it because i fill it will do the same thing) never used a verus Snap-on computer and I cant drive the vehicle i guess i can look see what to do I read multiple forms and people have similar problems but they fix it by switching PCMS crankshaft sensors ignition pickups TPS sensors and so forth just mine is not the case of that I guess but yeah I would like to know what other tools I can get an order to read what you're talking about so I can fix this problem without purchasing a verus
Ok just got a diagnostic on it and it's showing that the injectors or getting a wrong signal on the scope it is horrible they're just like up down up down there is no Spike or flat line
Topic Author
) 
