Variable Fresh Air Duct (VFAD) Control System Operation Inspection

Connect the M-MDS to the DLC-2.
Access the RPM PID.
Start the engine.

Inspect shutter valve operation under the following conditions.

VFAD shutter valve operation

VFAD SHUTTER VALVE OPERATION REFERENCE CHART

Engine speed	5,250 RPM
Engine speed	Below	Above
Shutter valve	Close	Open

If the shutter valve operation is not as specified, inspect VFAD solenoid valve. (See VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE INSPECTION [13B-MSP] .)
- If the VFAD solenoid valve is not normal, replace VFAD solenoid valve.
- If the VFAD solenoid valve is normal, inspect the following:
  - Open or short circuit PCM terminal 1AE and VFAD solenoid valve terminal B
  - Open or short circuit main relay and VFAD solenoid valve terminal B
  - Vacuum hose looseness or damage
  - Vacuum chamber cracked or damaged
  - Shutter valve actuator
    (See VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR INSPECTION [13B-MSP] .)
  - Shutter valve is stuck open or closed.