Long story short, I have been having a misfire problem for a few months now that i havent been able to track down. well until lastnight i couldnt figure out what 3 trouble codes were that i was getting. here are all of them
p0200-injector control circuit
p0300-engine misfire detected
p1222-injector control circuit intermittent
p1380-eb(t)cm dtc detected rough road data unusable
p1381-misfire detected- no eb(t)cm pcm serial data

so what do you guys think? bad pcm? i still have the misfire, a miss at all rpms and my lt fuel trim bank 2 is staying locked at 139 at idle........

 

At this point I might suspect it but would try to borrow a pcm and try it out before passing judgment. Bryan Herter in in PA, if you do not have anyone else to borrow one from you might contact him.

 

a failing PCM is rare. I would start checking each injector wire for it;s hot feed and it;s pulsing ground and see what one or ones your lacking. start there. the other codes for the brake control module is not for the engine computer

 

yeah theres a few guys aroiund here i might be able to borrow one from to try it out. brake control module huh? i was wondering what that meant. i guess thats the reason why my abs inop light has been on for like 3 months now. wish i knew that was the code and definition for it. the definition for that code was the one i posted and it was only abbreviatiuons bcm. thanks........

 

Those all look like engine related codes to me... 13xx-series codes are "GM specific ignition system or misfire" codes. [EDIT] Do you have traction control, because those codes can relate to the cross-connection between the TCS and the PCM?

The injectors problems and the misfires go hand-in-hand.... wouldn't be unusual to get those codes together. Have you been able to scan the misfire count for the individual cylinders? That will often point you in the correct direction? Injectors a relatively easy to check.... +12V at the pink wire on each connector, use a 'noid light to verify the PCM is providing the ground to each injector, check each injector for 12-15ohm coil resistance.

 

BCM=Body Control Module-nothing to do with brakes (found on 96 and later cars)

EBCM=Electronic Brake Control Module

EBTCM=Electronic Brake Traction Control Module (used in place of the EBCM for those cars with traction control)

None of those is part of the engine's computer (PCM).

 

yes i do have traction control, it also does not work anymore. i dont have to turn it off when i start the car like i used to. unfortunetly im using a hypertech programmer with the scan cartridge so i have no way of getting a code or scanning each cylinder seperatly. when this misfire happens, the car is dumping raw fuel out of the exhaust. and you can smell it big time.

 

personaly I would start wit the injectos and move from there. I don't know why the brake modules codes have anything to do with missfires (possibly cause the ABS/TCS can not operate under a severe missfire but I dunno for sure) have you done any rewireing or done anything in or under the dash?

do start with the injectors tho and get that miss taken care of and go from that after you clear the codes. test all the resistence like fred said. make sure you have battery voltage on the pink wires and use a noid light from autozone to test for the ground pulse or if you have a test light use that by hooking the clip to the pos batery cable. probe the other wire and have someone crank it. the light should pulse on and off. find out what your lacking and go from there. if your missing the hot feed on half he injectors check the 7.5amp fuses. if your missing the ground pulse on one or some backtrack to the PCM. if your resistence is out you have some bad injectors.

 

thanks for all the info and help guys. ill def test the injectors before i swap the pcm. ill post my results when i am done.

 

Well i just got done testing my injectors on the passenger side where the misfire is occuring( i know because of my scanner readins and also because it blew apart my stock cat on that side)

heres my findings. theinjectors all have constant power,they are pulsing on the ground side and the resistance is as follows:
cyl 2-13.6 ohms
cyl 4-13.2 ohms
cyl 6-13.2 ohms
cyl 8-13.2 ohms

I did find someone on here selling a pcm with 57,000 org miles on it so im gonna pick it up from him anyways sometime next week and give it a try.

oh and i forgot to mention my readings for the ms the injectors are opening for are bank1 (drivers side) 3.9+
bank 2(passenger side) 4.1+ @ idle

the car runs great until it hits closed loop. once it does the misfire and it running real rough with a def loss of power kicks in.......

 

TTT

 

Welll here is the update..........checked all the injectors and they are fine, bought a pcm from a fellow board member. took it out for a quick ride and it was def much better. the misfire was gone but the car still had a pretty bad miss to it. until the next time i drove it the misfire did come back again. but atleast the injector control circuit codes are gone. well i still had the #2 cyl plug to change so i figured id do it and see how it looks. well it looks fine but when i took out the alt i do believe i found my misfire problem. the wire for plug #6 is burnt through almost completely it apparently got pinched up against the header somehow by the tube for the air pump(i will be cutting that out soon) so im off to the parts store for a universal wire to run it over the valve cover until i buy another set of msd's only this time im getting the universals with the over the valve cover kit. off to the store i go ill post the results later.........