DTC P1512: Variable Tumble Control System Stuck Closed: Condition

DTC is set when PCM detects air flow is more than 45.2 gram/sec. when engine speed is more than 3000, engine coolant temperature is more than 158°F (70°C), and throttle valve opening angle is more than 75 percent. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Crankshaft Position (CKP) sensor malfunction.
• EGR boost sensor malfunction.
• Engine Coolant Temperature (ECT) sensor malfunction.
• Intake Air Temperature (IAT) sensor malfunction.
• Mass Airflow (MAF) sensor malfunction.
• PCM malfunction.
• Short circuit between PCM and VCTS solenoid valve.
• Throttle Position (TP) sensor malfunction.
• Variable Tumble Control System (VTCS) solenoid valve malfunction.
• VTCS shutter valve stuck closed.
• VTCS shutter valve actuator stuck closed.