Celica Coupe L4-107.5 1762cc 1.8L DOHC (7A-FE) (1995)
Thermal Vacuum Valve - EVAP: Testing and Inspection
1. DRAIN ENGINE COOLANT.
2. REMOVE TVV FROM WATER INLET HOUSING.
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Disconnect these hoses:
(1) Vacuum hose (from charcoal canister)
(2) Vacuum hose (from throttle body)
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Remove the TVV.
3. INSPECT TVV OPERATION.
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Cool the TVV to below 35°C (95°F) with cool water.
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Check that air does not flow from the upper port to lower port.
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Heat the TVV to above 54°C (129°F) with hot water.
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Check that air flows from the upper port to lower port.
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If operation is not as specified, replace the TVV.
4. REINSTALL TVV.