Quote:
Originally Posted by BigV
tw, all, I don't have a code number. The reader's display remained stubbornly blank when the tech connected it, when I connected it, when I slapped it around a little bit in an unproductive but cathartic attempt to relieve my frustration.
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If a check engine light is on, then a DTC exists. Furthermore, many systems store previous codes even after the check engine light is extinguished. However, not all readers can access this history.
Once it was standard to have a flashing LED on the engine controller. Count the flashes to get that code. That option has been discontinued by many (if not all) automakers.
Refer to a URL provided by BrianR. Notice three different serial port standards. All must be supported by the reader. Another classic example of Ford vs GM 'we cannot cooperate' mentality. Possible is that your reader does not support the serial port for your vehicle. That reader also would not reset (clear) the check engine light.
Finally, in some states, a car must fail emission tests if the check engine light is on. In those states, the reason for that check engine light must be corrected to obtain an inspection sticker.