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IAC Valve Resistance

Disconnect IAC valve connector. Measure resistance between terminals +B (Black/Yellow wire) and RSC (Yellow/Black wire), and between terminals +B (Black/Yellow wire) and RSO (Red/White wire) at IAC valve. See Fig 2. If resistance is not 17-24.5 ohms at 14-122°F (-10-50°C), or 22-29 ohms at 122-212°F (50-100°C), replace IAC valve. If resistance is as specified, reconnect IAC valve connector. Go to next procedure.

Fig 1: Data link Connector (DLC) No. 1 Connector Terminals
G97E06179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Operating Idle Air Control (IAC) Valve (ES300)
G94J45285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002