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Home >> Audi >> 1989 >> 200 Base, Standard >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Theory/Operation >> Computerized Engine Controls >> Cis Digital Control (Dc) >> 200 & 200 Quattro 2.2L Turbo
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200 & 200 Quattro 2.2L Turbo

CIS Digital Control (DC) system uses continuous injection system with Lambda for electronic control of mixture adjustment, emissions and ignition timing. An indicator light on dash illuminates if detonation becomes continuous or a fault is detected in circuitry.

Electronic controls consist of intake manifold pressure sensor (built into ECU), air temperature sensor, coolant temperature sensor, Electronic Control Unit (ECU), crankshaft speed sensor, crankshaft reference sensor, Hall Effect switch, knock sensor, throttle valve switch, brake switch, engine overheat sensor and oxygen sensor.

The ECU uses input from these sensors to control cold start valve, oxygen sensor heater, cold engine warm-up enrichment, Lambda control (frequency) valve, transistorized ignition coil, wastegate frequency valve, charcoal canister shut-off valve, fault warning light and ignition timing control.