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Jim
Grant has been working in the automotive industry for over twenty
years. In addition, Jim is an ASE Master Technician with advanced
L/1 certification. He works as manager and technician in his
family's automotive business in New Hampshire. He writes weekly
automotive consumer columns and is editor of an automotive newsletter
that is circulated throughout North America. |
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Jim Grant's Tech Tips
'97 Chevy Tahoe, Resetting "Service Engine Soon" Light
Q:
How do
you clear or reset the Service Engine Soon Light on a ’97 Chevy Tahoe?
- Charles C.
A:
There are
three ways to clear or reset the Service Engine Soon light in your vehicle
as well as most others. 1; with a computer scan tool. The software in
the scan tool allows for turning the Service Engine Soon light off. While
you’re having that performed, have the technician record the code/reason
for the warning light being on, there may be a system problem that needs
to be addressed. 2; disconnect the battery. Disconnecting the battery
causes the computer to lose all its memory. The only problem there is
you will not know why the warning light was on. 3; drive the vehicle.
The warning light comes on if there is a system problem or if the key
was in the on position and a computer sensor was disconnected. Just about
every time you start the engine and drive your vehicle, the computer runs
a series of system tests, this is called a drive cycle. Before the computer
will turn off the warning light the vehicle and computer have to go through
3 drive cycles. If the computer has determined that there is not a system
problem after 3 drive cycles of testing the light will be turned off.
After about 50 drive cycles the computer will remove/delete the code that
it stored. If after 3 or 4 days of driving the service engine soon light
has not turned off then you may very well have a problem that needs to
be addressed.
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