ISC Valve

Disconnect ISC valve electrical connector. Connect ohmmeter to Idle Speed Control (ISC) valve 2-wire connector. Measure resistance. Resistance should be 11-13 ohms at 68°F (20°C). If resistance is not within specification, replace ISC valve.

Fig 1: Cross-Sectional View Of Air Valve (Miata)

Courtesy of MAZDA MOTORS CORP.