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Home >> Ford >> 1993 >> Probe Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Controls - Tests W/Codes - 2.3L) >> Additional System Functions >> Engine Controls - Tests W/Codes - 2.3L >> Hardware Limited Operational Strategy (HLOS)
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Hardware Limited Operational Strategy (HLOS)

WARNING: This page is about a different car, the 1993 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

If a number of system or sensor failures are present and PCM is not receiving enough information to operate, PCM will switch to HLOS mode. PCM will output fixed values to allow operation of vehicle. Driveability concerns will be present. PCM will not output service codes in this mode.

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