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ECM Trouble Codes

Procedure for Retrieving Trouble CodesWith the ignition "off", insert a jumper wire between the A & B terminals. Turn the ignition to the "run" position but do not start the car. The check engine light will start a sequence of blinks.
For example: 1 flash, pause, 2 flashes
This sequence would denote code 12 which should be present every time you test for codes. Any stored trouble codes will follow code 12.

View the Testing Codes & Understanding the ALDL Connector in the Tech section for the ALDL port location.

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