Detection Condition

PCM monitors barometric pressure by monitoring difference between intake manifold vacuum and atmospheric pressure at idle. PCM monitors atmospheric pressure at idle by using EGR boost sensor and by switching EGR boost sensor solenoid. DTC is set when barometric pressure variation is less than 1.9 in. Hg. This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in 2 consecutive drive cycles. Pending code is available if PCM detects malfunction condition during first drive cycle. Freeze Frame Data is available and DTC is stored in PCM memory.