Variable Induction System: Testing and Inspection

Variable Air Duct (VAD) Control System Operation Inspection

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




5. Inspect shutter valve operation under the given conditions.

- If the shutter valve operation is not as specified, inspect the following:

1. Verify that DTC P1410 is not displayed.
- If DTC P1410 is displayed, perform DTC inspection. (See DTC TABLE. Diagnostic Trouble Code Descriptions)

2. Inspect VAD control solenoid valve.
- 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 crack or damage
- Shutter valve actuator. (See VARIABLE AIR DUCT (VAD) SHUTTER VALVE INSPECTION.)
- Shutter valve stuck open or close