April 5, 2026: LEMON Manuals is launched! Read the announcement.

Variable Air Duct (VAD) Control System Operation Inspection

Connect M-MDS to DLC-2.
Access ECT, TP_REL and RPM PIDs.
Start the engine.
Verify ECT PID is 70°C {158°F} or over .

Inspect shutter valve operation under the following conditions.

VAD shutter valve operation

VAD SHUTTER VALVE OPERATION

Engine speed	5,800 RPM with TP_REL PIDs 50% or over
Engine speed	Below	Above
Shutter valve	Close	Open

If the shutter valve operation is not as specified, inspect as follows:
1. Verify that DTC P2676 or P2677 is not displayed.
  - If DTC P2676 or P2677 is shown, perform DTC inspection.
    (See DTC TABLE [L3] ).
2. Inspect VAD control solenoid valve.
  (See VARIABLE AIR DUCT (VAD) CONTROL SOLENOID VALVE INSPECTION [L3] ).
  - If the VAD control solenoid valve is not okay, replace VAD control solenoid valve.
  - If the VAD control solenoid valve is okay, inspect the following:
    - Vacuum hose looseness or damage
    - Vacuum chamber cracks or damage
    - Shutter valve actuator.
      (See VARIABLE AIR DUCT (VAD) SHUTTER VALVE INSPECTION [L3] ).
    - Shutter valve is stuck open or closed.