Thermal Vacuum Valve - EVAP: Testing and Inspection

INSPECT TVV OPERATION WITH COLD ENGINE
(a) The engine coolant temperature should be below 45°C (113°F).
(b) Disconnect the EVAP hose from the union pipe.
(c) Start the engine.





(d) Gradually increase the engine speed from idle to 3,000 rpm, and check that air suction is not felt at the union pipe.

OFF-VEHICLE INSPECTION
1. DRAIN ENGINE COOLANT





2. REMOVE TVV FROM CYLINDER HEAD
(a) Disconnect the 2 vacuum hoses from the TVV.
(b) Remove the TVV.
3. INSPECT TVV OPERATION





(a) Cool the TVV to below 45°C (113°F) with cool water.
(b) Check that air flows from port J to the air filter.





(c) Heat the TVV to above 64°C (147°F) with hot water.
(d) Check that air flows from port J to K.
If operation is not as specified, replace the TVV.





4. REINSTALL TVV
(a) Apply adhesive to 2 or 3 threads of the TVV.

Adhesive:
Part No. 08833-00070, THREE BOND 1324 or equivalent

(b) Install the TVV.

Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

(c) Connect the 2 vacuum hoses to the TVV.
5. REFILL WITH ENGINE COOLANT