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Idle Air Control Valve Resistance

Checking IAC valve electrically. Disconnect harness connector from IAC. See Fig 1.
Using a DVOM, switch to resistance range (mode). Measure resistance across IAC terminals. See Fig 2.
IAC resistance must be 7-11 ohms. If resistance is out of specification, replace IAC.

Fig 1: Identifying Idle Air Control Valve Harness Connector

Courtesy of AUDI OF AMERICA, INC.

Fig 2: Testing Idle Air Control Valve Resistance

Courtesy of AUDI OF AMERICA, INC.