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In order to scan your car for codes, you must first locate the diagnostic connector.
It will be under the drivers side dash. Here is an example of its location. Your
vehicle may be in a little different spot.
If you do not have a car code reader, many of the large national parts store chains
will scan your cars computer for free.
On todays newer vehicles (1996-and up, OBDII), the diagnostic terminal is what
powers up the scan tool. If the scan tool does not power up after plugging in to the
connector, you will need to check fuses. Different vehicles use different fuses to
power this connector.
After reading the codes(s) and the short description, you will need to use a diagnostic
chart to pinpoint the problem. Just because the scanner shows, lets say, a code for the
intake air temp.sensor, does not necessarily mean that the sensor is bad.
The most basic scanners will just read trouble codes from the Powertrain Control
Module (PCM). A little higher priced scanners will read codes, and give some live data
streams. The high end scanners will do this, and read other computers such as Body
Control Module(BCM), Anti-lock Brake module(ABS), Airbag module(SIR), Door
modules, 4-wheel drive modules, etc. These will also be able to control devices in a
given circuit to go along with diagnostic charts, and run pre-programmed test, and
re-program replacement computers.
Need help with your code?
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How to scan for computer (PCM)
codes on GM vehicles