Hard Failures
WARNING: This page is about a different car, the 1994 Eagle Vision, 1994 Dodge Intrepid, 1994 Chrysler New Yorker, 1994 Chrysler LHS, and 1994 Chrysler Concorde. However, it is still accessible from the selected car via links, so may be relevant.
Hard failures will cause MIL to illuminate and remain on until malfunction is repaired. If MIL comes on and remains on (or light flashes) during vehicle operation, cause of malfunction must be determined using diagnostic tests.
If a sensor fails, PCM will use a substitute value in its calculations, allowing engine operation in limp-in mode. In this condition, vehicle will run but driveability will be poor.