There is a capacitor in the PCM that helps the PCM retain information should
there be any fluctuations in current. Once you disconnect the ground the
capacitor will lose all of its current in about 15 minutes. By holding the
key in the START position you cause that current to drain faster ~15
seconds. There are many variables held in the PCM. Most have to do with
timing and air/fuel ratios. As you drive the PCM "remembers" your habits
such as shift points due to the amount of lead in your foot etc. This helps
the system react to what you expect.
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of jay & dana
Sent: Sunday, September 24, 2000 5:33 PM
To: DML
Subject: DML: Computer reset
Some say to reset the computer you disconnect the ground of the battery and
wait for 20 mins. or so and it will automatically reset, after reconnecting
the ground. Others say disconnect the ground, hold key to start position
for 15 to 20 seconds and reconnect ground. Okay here is my question. If
ground is off the battery what good does holding the key to the start
position for 15 to 20 seconds do if there is no juice coming from the
battery? How does this "bleed" the computer of its previous "knowledge of
settings"? And when you start it up again after reconnecting the negative
what exactly happens to the computer? Any response would be extremely
appreciated. (Bernd, Ron!)
Thanks
Jay
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