PCM code

[250stroker]

my evoution is reading a pcm keep alive memory code does anybody have access to the wiring diagram to the pcm i also posted this in the urgent forum also my trans is shifting funny thanks a lot

[mschn99]

i have access to both workshop manuals and wiring diagrams, but a wiring diagram will not help you with a KAM code, that is a hard fault that must be fixed in order for it to clear. what is the code, and ill try to help you figure it out

[toobadq]

KAM code is set when you lose power to the PCM ( unhook the batterys, low battery voltage while cranking and such). Also some chips/programers set that code also. Do you have any drivablity problems, is you check engine light on?

[mschn99]

he said his trans is shifting funny, which will also set a KAM code. the cam code set during battery replacement is just a P1000, which is just saying that OBDII moniters have not completed all tests. it will reset itself once all moniters have ran through a pre determined amount of drive cycles.

[toobadq]

KAM code shows lost power to Keep alive mem, P0603 is the code. That might clear trans tables.

[mschn99]

if he has a code for KAM memory error yes (p0603, as you said), but that is not the only code that can be stored in KAM......it can be an actual trouble code too.....and unless the battery cables have been unhooked recently, the P0603 is probably caused by his chip, which is why i asked for further clerification as to his code before i gave him advise.....i just did not want to jump the gun and tell him something if there was a totally different issue causing the code.

[toobadq]

What, other than lost voltage to Pcm can set this code? Other than his powermod.

[mschn99]

Originally Posted by toobadq

What, other than lost voltage to Pcm can set this code? Other than his powermod.

if it is a 603, it could be faulty wiring or a bad pcm...both could cause a voltage loss to the pcm (on the constant hot wire), but many trans codes are stored in KAM, along with certain engine hard faults. depending on the fault, it can be stored as an event and not even turn the CEL on, stored as a hard fault, turn the light on, or be a KAM code which is only cleared after the code is fixed and the event does not happen for a certain amount of drive cycles. trans codes are very prone to this. when the PCM sees a trans code that could potentially result in a harmfull event, most OBDII systems set a KAM code which the PCM uses to minimize the potential hazard. in the event of a total trans failure for example, the PCM would first see an overheat, and try to lower trans pressures (just an example, its all more complicated than this) to minimize negative effects and possibly save things if its lets say, just a plugged cooler causing the overheat. by reducing the amount of heat the trans can build, the pcm has a stratagy to possibly save it if its not the causual part. untill the PCM recognizes that the hazard is not there, the KAM code will stay. the reason i brought up the possibility was because he specifially said he had a trans issue.....which is why i wanted the code.

[toobadq]

Buzz over to FMC and check out MA1. If the code is p0603 then the only thing to set this code is lost power or ground to PCM. I have never seen any other KAM code. I looked on FMC no other listing on KAM codes. If the PCM lost power is mostlikly cleared the trans tables, thus his trans acting up. Bad battery cables, weak batterys, shorted PCM,water in PCM, chaifed wire, play the radio to long with engine off, who knows. I got other thing to do. Keep up the good work.

[mschn99]

you are perfectly correct on what the issue is if its a 603, and im as content as you to get onto other things and leave it at that....and thanks for the compliment, you seem like a pretty dang knoledgable guy, so you keep up the good work too, and hope you arent eating your ^%$ as bad as i am on the sick-0......although at least now we know some of the tricks to try to keep up with SLTS times....but anyways, have a good weekend, and cheers.....