DTC P1512: Variable Tumble Control System (VTCS) Shutter Valve Stuck: Condition
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Powertrain Control Module (PCM) detects Mass Airflow (MAF) sensor signal does not increase when VTCS shutter valve moves from closed to open position. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- VTCS shutter valve actuator malfunction.
- Short to ground in circuit between VTCS solenoid valve and PCM.
- Disconnected vacuum hoses.
- PCM malfunction.