Powertrain Control Module (PCM) Hardware Limited Operation Strategy (HLOS): Notes
WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
This system of special circuitry provides minimal engine operation should the PCM, mainly the central processing unit (CPU) or EEPROM, stop functioning correctly. All modes of self-test are not functional at this time. The electronic hardware is in control of the system while in HLOS.