Hard Failures
WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
Hard failures cause Malfunction Indicator Light (MIL) to glow and remain on until problem is repaired. If light illuminate and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic tests. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If a sensor fails, Powertrain Control Module (PCM) will use a substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, vehicle runs but driveability will not be optimum.