Variable Intake-Air System (VIS) Inspection
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Start engine.
- Inspect rod operation. See VIS SHUTTER VALVE ROD OPERATION - MAZDA6 (2.3L) table. If shutter valve actuator rod operation is not as specified, inspect as follows:
- Stop engine.
- Connect scan tool to DLC-2.
- Ensure DTC P0661 or P0662 is not displayed. If DTC P0661 or P0662 is displayed, see appropriate DTC testing procedure under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - MAZDA6 2.3L article.
- Check VIS control solenoid valve. See VARIABLE INTAKE-AIR SYSTEM CONTROL SOLENOID VALVE INSPECTION . If VIS control solenoid valve is faulty, replace VIS control solenoid valve. If VIS control solenoid valve is okay, check following:
- Vacuum hose and vacuum chamber for looseness or damage.
- VIS shutter valve actuator. See VARIABLE INTAKE-AIR SYSTEM (VIS) SHUTTER VALVE ACTUATOR INSPECTION .
- Check if VIS shutter valve is stuck open or closed.
Repair as necessary.
VIS SHUTTER VALVE ROD OPERATION - MAZDA6 (2.3L)
| Engine RPM | Shutter Valve Operation |
|---|---|
| Less Than 4500 | Operates |
| More Than 4500 | Does Not Operate |