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Depending on the vehicle, the Self-Test Connector on Ford vehicles is located in different places under the hood, and can be either the color black or gray. A jumper wire connected between Terminal #2 (self-test output) and the self-test input (STI) connector will place the ECA (Electronic Control Assembly—Ford’s name for its on-board computer) in self-test mode. A test light connected as shown in the diagram will then flash out the trouble codes. On later models after 1986, the “Check Engine” light takes the place of a test light for purposes of reading codes.

Source: Motorbooks Workshop: How to Use Automotive Diagnostic Scanners by Tracy Martin

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