If the vacuum does not change, you can conclude that the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.
Conclude forced driving of the VSV for the EVAP.
(1) Stop the engine.
(g) If you have no TOYOTA Hand-Held tester: Conclude forced driving of the VSV for the EVAP. (1) Stop the engine.
Author- Dntp- 1002
(2) Disconnect the positive (+) and negative (-) leads from the battery from the VSV terminals for the EVAP.
Connect a pressure gauge to the EVAP service port on the purge line.
(j) Check the pressure.
(1) Close off the air drain hose at the marked position of the canister with a hose clipper or similar instrument.
(2) Add the pressure (13.5 - 15.5 in. Aq) from the EVAP service port.
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