Variable Tumble Control System (VTCS) Shutter Valve Actuator Inspection
Disconnect vacuum hose from actuator. Connect a vacuum pump to actuator. See Fig 1 or Fig 2 . Watch actuator rod and slowly apply vacuum to actuator. See SHUTTER VALVE ACTUATOR VACUUM APPLICATION table. If actuator does not operate as specified, replace actuator. If system is not working properly but actuator is okay, check vacuum lines.
SHUTTER VALVE ACTUATOR VACUUM APPLICATION
| Application (Vacuum - in. Hg) | Actuator Rod Position | |
|---|---|---|
| Miata | ||
| More Than -2.0 | Not Pulled | |
| About -2.7 | Starts To Move | |
| Less Than -10.2 | Fully Pulled | |
| Protege & Protege5 | ||
| More Than -0.80 | Not Pulled | |
| -2.4 to -10.4 | Starts To Move | |
| Less Than -10.4 | Fully Pulled | |
NOTE:
Perform VTCS solenoid check only when directed by SELF-DIAGNOSTICS testing.