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Home >> Mercury >> 1994 >> Villager LS >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Self-Test Output/Self-Test Input (STO/STI) Connectors
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Self-Test Output/Self-Test Input (STO/STI) Connectors

The STO connector is a 6-pin connector used to perform self-test diagnostic procedure. The STI is a single-pin connector, located next to STO. When STI is grounded, it activates fault code output function. Codes are retrieved through STO connector.

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