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You can't use a scan tool to retreive code on that car. The computer doersn't have that capability.
You can read flash codes right off the led on the computer itself located under the front of the console.
PROCEDURE:When the Check Engine warning light has been reported on, turn the ignition on, move the front passenger seat to the rear position and observe the LED on the front of the ECU. The LED indicates a system failure code by blinking frequency. The ECU LED can indicate any number of simultaneous component problems by blinking separate codes, one after another.
If output indicates CODE 4, 11, 15, 16 or exceeds 17, count the number of blinks again. If the indicator is in fact, blinking these codes, substitute a known-good ECU and recheck If the indication goes away, replace the original ECU.
If you fi9nd that model doesn't have the LED on the computer, then it has a diagnostic connecter that you jump out and the check engine light flashes the codes.
Here's the connecter