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Home >> Audi >> 1994 >> 90 CS Quattro >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Knock Sensor (KS)

Knock Sensor (KS)

One KS is installed on each head under intake manifold. Using 2 sensors makes it possible for MFI ECM to sense cylinder knock more accurately. KS I is located on right cylinder bank and monitors cylinders No. 1, 2 and 3. KS II is located on left cylinder bank and monitors cylinders No. 4, 5 and 6. See DETONATION RETARD OPERATION under IGNITION CONTROL.

NOTE: Due to a production change, Cabriolet and Audi 90 models are equipped with one of 2 different ECMs. Early version ECM can be identified by part number 4AO 906 266 A/AA/AB (MMS 200), referred to as ECM "A" in this article. Later version ECM can be identified by part number 8AO 906 266 B (MMS 300), referred to as ECM "B" in this article. Audi 100 models use ECM "A".
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