PCM? reset?

[SuprSpdDB7]

in a reponse that someone had written they told the guy to reset his PCM... (the problem was hesitation at 50mph) i have the same problem.. how do u reset the PCM? and not to be made fun of or anything but WHAT IS the PCM?

[daWhoady]

PCM is the cars computer I guess you call it. It regulates certain things in your car. I don't know much about it though.

Whats wrong with your car? Is it just a slight hesitation around 50mph? Does it do it any other time? Does it hesitate when you try to accelerate?

[TheBeast]

Open the two fuse box covers underneath the hood. Look underneath the lids to find the two that are labeled w/ PCM in the name, pull those two and replace them in 30 minutes.

[SuprSpdDB7]

umm..k.

my car is hesitating ALL the time.. whenever i accelerate! it sux! i just replaced all my plugs and wires about a week ago! along with hesitation is doesn't shift properly (when it's supposed to) (i have an A4)

[Tyler]

by resetting the PCM, will this make the car run better? like say i reset the computer, then go to drive it and drive the hell out of it, will it reprogram itself to run with better performance?

[Shadly]

Resetting the PCM resets codes and retrains for new parts. It probably won't correct a problem. It sounds a little like a miss. Did those plug wires go back on correctly? Any SES light?

[RedbirdV6]

Well you have a 96 so your PCM fuses are in the fuse box on the side as you open the drivers door but don't think a reset will help you, sounds like a bad plug wire, plugs or the most common coil pack

[SuprSpdDB7]

HOW MUCh is a coil pack? how hard to replace? is it that think that the plugs pluged into on the top of the engine? and i am going to check the 4th sparkplug because i got an SES light and the code said "misfire cylindar 4" so.....

[Ttop34]

Just to post the correct PCM reseting procedure here it is.

If you have it where your PCM fuses are under the hood like mine, turn on the ignition but not with the car running, pull the PCM BAT fuse first and then the PCM IGN fuse. Turn off the ignition and replace the two fuses. Then start the car and your PCM should be cleared. I've gotten quite efficent at this since my stupid o2 sim isn't working for me.

I believe it's the same procedure to do this if your PCM fuses are on the drivers side panel.

I don't think this is your problem but it won't hurt anything to try it.

[strange_trp]

pcm = powertrain control module. controls ignition and fuel delivery to your engine, as well as transmission operation and emissions components.

if you're getting code p0304 and the plug and wire are good, try swapping with another coil and see if the misfire moves. if so replace faulty coil. if not diagnose module circuits. also make sure terminals from module to coil are clean.

this may not be an ignition problem though. most likely it is a bad coil but it could also be many other things like an intake manifold leak in the # 4 runner could cause a lean miss as well. ignition parts per se are not always the cause of misfires or even rough engine operation.

[Steve Caroccia]

those would be a 50 Amp and a 15 Amp or a 50 Amp and a 10 Amp? Thanks