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Idle Speed Control (ISC) Valve

WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 BMW Z3, 1998 BMW M3, 1998 BMW M Roadster, 1998 BMW 750iL, and 1998 BMW 740iL. However, it is still accessible from the selected car via links, so may be relevant.
ISC VALVE RESISTANCE - Ohms @ 68°F (20°C)

Application Ohms
2-Terminal Connector 15-25
3-Terminal Connector
Terminals No. 1 & 2 15-25
Terminals No. 1 & 3 35-45
(1) ISC valve may be a 2-terminal or 3-terminal type.