what's the procedure in resetting the pcm?

 

Pull the fuse for about a half hour, then reinstall.

Don't do it with the key on to avoid damaging the PCM due to voltage spikes.

 

cool beans. I'll give it a try

 

Why are you resetting your PCM? I've heard this doesn't accomplish much. I asked the same question before but included the 'what will it help/hurt'...nothing was what most people said...

 

It doesn't hurt.

It will reset the IAC stepper motor, and your long-term integrators would need to be re-learned. Not a bad idea if you swap any sensors, etc.

It can't hurt anything.

 

I was at the track yesterday and during mid run, my SES light came on. So I'm gonna reset the PCM and see if it will clear. If not, I'll just get the code read and take it from there.

 

BTW, you only need to pull the PCM fuse for a few secs, not 1/2 hour (in my experience at least). That is enough time to reset the BLMs on my car, along with the IAC, etc.

 

It depends on the year of the car, but most are on the side of the dash and labeled PCM BATT except for 1995 where it is under the hood and just says PCM.

A few seconds is all it takes, but waiting about 15 seconds makes sure you don't repower the pcm too quickly.

Disconnecting the battery will also do it because it removes power to everything. The fuse is easier.

 

For us OBD I guys a split second will do it, I dont know the procedure for OBD II but there is a guide on www.projecttransam.com I believe.

 

Rob,
Do you only have to pull the one that says pcm-batt? I always pull both of them but I wasn't sure if it's necessary.

 

ok, took my car to Auto Zone and got my code read.

P0100
The PCM has determined that a malfunction exists in the electrical circuit for the mass air flow or volume air flow sensor. This code points towards a possible wiring problem, IE : short to ground, short to power, or an open circuit.

does this has anything to do with the fact that it's hard to get the tranny into reverse. Someone told me that it could be the reverse lockout solenoid. So I'm not sure. Checked the MAF sensor and it was fine but not sure what the other one is.

 

PCM_BATT will do it, on OBD I.

 

Will this activate the VATS system, as in will I need the VATS code for my car to run after I do this?

I still have an SES light that comes on only when I drive and goes off after a few secs of sitting at a stoplight, then back on again when I leave the stoplight. I don't know what's causing it and can't get the troublecode read since it doesn't stay on all the time, maybe the PCM reset will clear it out?

 

I guarantee it's your AIR pump fuse. Run out and replace that sucker.

 

Thanks!