Any stored trouble codes will follow code 12. This sequence would denote code 12 which should be present every time you test for codes. The check engine light will start a sequence of blinks.

Turn the ignition to the 'run' position but do not start the car. Testing for Engine Trouble Codes With the ignition 'off', insert a jumper wire between the A & B terminals. These terminals are used to test for engine trouble codes, fuel pump operations, engine light functionality and automatic TCC operation

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Aldl plug