Motorcraft Home Technical Resources Home Non-Subscription Resources What's New Body Repair Manuals Diagnostic Tool Support OBDII Theory & Operation Paper/CD Manuals Quick Guides Tools & Equipment Membership Accounts My Shopping Cart Subscription Products Keycode Lookup Reprogramming & Initialization Service Publications Technical Service Bulletins Technical Training Purchase Subscription Ford Specific Acronyms # A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  0-9  (Indexed by Abbreviation) Acronyms Description Hall effect A process where current is passed through a small portion of semiconductor material and a magnetic field to produce a small voltage in the semiconductor. Hard Fault A fault currently present in the system. HC 1. Hydrocarbon. A by-product of combustion and a component of auto exhaust emissions. 2. High Compression. HCDSS High Clutch Drum Speed Sensor. PCM input from the 4R44E and 4R55E. HFC High Fan Control HFCF High Fan Control Fault. Identifies if there is a fault in the HFC circuit. HFP High Fuel Pump HLOS Hardware Limited Operating Strategy. A mode of operation where the PCM replaces output commands with fixed values in response to internal PCM malfunctions. HO High Output HO2S Heated Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM. Hot Soak Period of time after an engine operates where localized combustion heat dissipates throughout the engine. HTR11, HTR12, HTR13, HO2S Heater. Heater element for the HO2S sensor. Hydrogen Chemical symbol H. Highly flammable gas. Hz Hertz. Cycles per second.

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