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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - Theory & Operation - 3.3L Gasoline) >> Self-Diagnostic System >> Serial Communications Interface (Sci)

Serial Communications Interface (Sci)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.

SCI circuit is used by PCM to send data to and receive data and sensor activation signals from DRB tester. DRB uses signals sent on SCI to display fault messages, sensor voltages and device states (ON/OFF). DRB uses SCI to send solenoid and switch activation commands to PCM so that devices and circuits can be tested. SCI is also used to reset Service Reminder Indicator (SRI) light and to write SRI mileage to PCM.

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