System Check (MX-3 DOHC, MX-6 2.5L & 626 2.5L)
Connect tachometer to IG terminal of diagnostic connector. See Figure . Start engine, and operate it 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 1 . If necessary, check Variable Resonance Induction System (VRIS) components.
VRIS RPM SPECIFICATIONS
| RPM | Position | ||
|---|---|---|---|
| MX-3 DOHC | |||
| Shutter Valve Actuator Rod No. 1 | |||
| Less Than 1900 | Closed | ||
| 1900-2600 | Open | ||
| 2600-4000 | Closed | ||
| 4000-6300 | Open | ||
| Greater Than 6300 | Closed | ||
| Shutter Valve Actuator Rod No. 2 | |||
| Less Than 1900 | Closed | ||
| 1900-2600 | Open | ||
| 2600-4700 | Closed | ||
| 4700-6300 | Open | ||
| Greater Than 6300 | Closed | ||
| MX-6 2.5L & 626 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 | ||