System Check (2.5L)

Connect tachometer to IG terminal of diagnostic connector. See Fig 1 . Start engine, and operate at idle. Manually open throttle valve. Ensure shutter valve actuator rods No. 1 and 2 retract at specified RPM. See VRIS RPM SPECIFICATIONS table. See Fig 2 . If necessary, check Variable Resonance Induction System (VRIS) components.

Fig 1: Diagnostic Connector Terminal ID (2.5L)

Courtesy of MAZDA MOTORS CORP.

VRIS RPM SPECIFICATIONS

RPM			Position
2.5L
Shutter Valve Actuator Rod No. 1
Less Than 3250			Closed
3250-4250			Open
4250-6250			Open
Greater Than 6250			Closed
Shutter Valve Actuator Rod No. 2
Less Than 3250			Closed
3250-4250			Closed
4250-6250			Open
Greater Than 6250			Closed

Fig 2: Locating Shutter Valve Actuators (2.5L)

Courtesy of MAZDA MOTORS CORP.