MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Variable Induction Control Actuator: Testing and Inspection
VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SHUTTER VALVE ACTUATOR INSPECTION
NOTE: Perform the following test only when directed.
1. Disconnect the vacuum hose from the VTCS shutter valve actuator.
2. Connect a vacuum pump to the VTCS shutter valve actuator.
3. Apply vacuum slowly and inspect the rod movement of the VTCS shutter valve actuator under the following conditions:
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If not as specified, replace the VTCS shutter valve actuator. (See VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SHUTTER VALVE
ACTUATOR REMOVAL/INSTALLATION.)
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If as specified but the Simulation Test failed, inspect for the following:
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Vacuum hose improper routing, kinks or leakage.