Powertrain Control Module (PCM) Hardware Limited Operation Strategy (HLOS)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 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 electronically erasable programmable read only memory (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.

HLOS Allowable Output Functions: -

spark output controlled directly by the CKP signal
fixed fuel pulse width synchronized with the CKP signal
fuel pump relay energized

PCM Location - The PCM is located behind the instrument panel (cowl), center to both driver and passenger sides (access from the engine compartment).