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Variable Dynamic Effect Intake-Air (VDI) Operation Inspection

Connect the WDS or equivalent to the DLC-2.
Access the RPM PID.
Start the engine.
Inspect the rod operation under the following condition:
Rod operation

Fig 1: Rod Operation At 7250 RPM
Courtesy of MAZDA MOTORS CORP.

If the rod operation is not as specified, inspect as follows:
1. Stop the engine.
2. Connect the WDS or equivalent to the DLC-2.
3. Verify that DTC P0076 or P0077 is not displayed.
  - If DTC P0076 or P0077 is shown, perform DTC inspection. (See DTC TABLES .)
4. Inspect the VDI solenoid valve. (See VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) SOLENOID VALVE INSPECTION .)
  - If the VDI solenoid valve is not normal, replace the VDI solenoid valve.
  - If the VDI solenoid valve is normal, inspect the following:
    - Vacuum hose and vacuum chamber for looseness or damage
    - Shutter valve actuator (See VARIABLE DYNAMIC EFFECT INTAKE-AIR (VDI) ACTUATOR INSPECTION .)
    - Shutter valve stuck open or closed