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 O2S11, O2S12, O2S13, Oxygen Sensor. Provides information on rich or lean exhaust conditions to the PCM. OASIS On-line Automotive Service Information System OBD, OBD-II On-Board Diagnostics, On-Board Diagnostics Second Generation. A system that monitors the PCM input and output control signals. OC Oxidation Catalytic converter. A catalytic converter system that reduces the levels of HC and CO emissions. OCS Overdrive Cancel Switch OCT ADJ Octane Adjust. Compensating strategy that adjusts for changes in fuel octane. OEM Original Equipment Manufacturer OHC Overhead Cam. An engine configuration that uses a single camshaft positioned above the valves. OL Open Loop. An operating condition based on instructions not modified by PCM feedback. On-Demand Test The KOEO and KOER tests of the PCM initialized by a technician. Open Circuit A circuit which does not provide a complete path for the flow of current. OSC Output State Control OSS Output Shaft Speed OSS Output Shaft Speed. Indicates the rotational speed of the transmission output shaft. OTM Output Test Mode OWL Overheat Warning Lamp or its signal output from the PCM. Turns the TEMP warning lamp ON when the engine oil temperature exceeds safe limits. Ozone A blue, gaseous form of oxygen (O3) formed naturally by electric discharge or exposure to ultraviolet radiation.

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