MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Variable Induction Check Valve: Testing and Inspection
VARIABLE TUMBLE CONTROL SYSTEM (VTCS) CHECK VALVE (ONE-WAY), DELAY VALVE INSPECTION
1. Remove the VTCS check valve (one-way) or delay valve. (See VARIABLE TUMBLE CONTROL SYSTEM (VTCS) CHECK VALVE
(ONE-WAY), DELAY VALVE REMOVAL/INSTALLATION.)
2. Blow through A and verify that the air flows from B.
3. Blow through B and verify that the air does not flow from A.
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If not as specified replace the VTCS check valve (one-way) or delay valve.
