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Home >> Mazda >> 1990 >> Protege 4WD, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Idle Speed Control (ISC) System >> ISC Valve
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ISC Valve

Measure resistance of ISC valve at 2-wire connector. 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, Protege & 323)
G90C18384Courtesy of MAZDA MOTORS CORP.