14A-12 Service Information Guide (All) Abbreviation O - W Description O2S O2 sensor OBD On-board diagnosis OEM Original equipment manufacturer OPT Option OT Oil temperature P/L Pilot light PCV Pump control valve / Positive crankcase ventilation P-I Proportion-integration PM Particulate matter PTO Power take-off PWM Pulse width modulation wave QOS Quick on start system QWS Quick warming up system RH Right side R/L Relay RAM Random access memory REF Reference ROM Read-only memory RP Rail pressure RR Rear Rr Rear RWD Rearward SAE Society of Automotive Engineers SBF Slow blow fuse SCV FRP regulator SIG Signal SLD Shield ST Starter/Start STD Standard SW Switch TDC Top dead center TEMP Temperature TP Throttle position VB Battery voltage VGS Turbo Variable geometry system turbo W/H Wire/Harness W/L Warning light W/S Weld splice WOT Wide open throttle