Hardware Limited Operation Strategy (HLOS)
WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. 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. Electronic hardware is in control of the system while in HLOS.
HLOS Allowable Output Functions: -
- spark output controlled directly by the crankshaft position (CKP) signal
- fixed fuel pulse width synchronized with the CKP signal
- fuel pump relay energized
- idle speed control output signal functional
HLOS Disabled Outputs To Default State: -
- exhaust gas recirculation (EGR) solenoids
- no torque converter clutch lock-up