Detection Condition
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
PCM monitors Variable Tumble Control System (VTCS) shutter valve position using VTCS shutter valve switch. If PCM turns VTCS solenoid valve on but VTCS position still remains open (VTCS shutter valve switch off), PCM determines VTCS shutter valve has been stuck open. This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for same malfunction has been stored in PCM. PENDING CODE is available if PCM detects malfunction condition during first drive cycle. FREEZE FRAME DATA is available. DTC is stored in PCM memory.