2005 MY OBD System Operation Summary for Gasoline Engines

TYPICAL INDEX RATIO CATALYST MONITOR ENTRY CONDITIONS:Entry condition Minimum MaximumTime since engine start-up (70 o F start)330 secondsEngine Coolant Temp 170 o F 230 o FIntake Air Temp 20 o F 180 o FTime since entering closed loop fuelInferred Rear HO2S sensor Temperature30 sec900 o FEGR flow (Note: an EGR fault disables EGR) 1% 12%Throttle Position Part Throttle Part ThrottleRate of Change of Throttle Position 0.2 volts /0.050 secVehicle Speed 5 mph 70 mphFuel Level 15%First Air Mass Cell 1.0 lb/min 2.0 lb/minEngine RPM for first air mass cell 1,000 rpm 1,300 rpmEngine Load for first air mass cell 15% 35%Monitored catalyst mid-bed temp. (inferred) for first air mass cell 850 o F 1,200 o FNumber of front O2 switches required for first air mass cell 50Second Air Mass Cell 2.0 lb/min 3.0 lb/minEngine RPM for second air mass cell 1,200 rpm 1,500 rpmEngine Load for second air mass cell 20% 35%Monitored catalyst mid-bed temp. (inferred) for second air mass cell 900 o F 1,250 o FNumber of front O2 switches required for second air mass cell 70Third Air Mass Cell 3.0 lb/min 4.0 lb/minEngine RPM for third air mass cell 1,300 rpm 1,600 rpmEngine Load for third air mass cell 20% 40%Monitored catalyst mid-bed temp. (inferred) for third air mass cell 950 o F 1,300 o FNumber of front O2 switches required for third air mass cell 30(Note: Engine rpm and load values for each air mass cell can vary as a function of the power-to-weight ratioof the engine, transmission and axle gearing and tire size.)TYPICAL MALFUNCTION THRESHOLDS:Rear-to-front O2 sensor switch/index-ratio > 0.75 (bank monitor)Rear-to-front O2 sensor switch/index-ratio > 0.60 (Y-pipe monitor)Rear-to-front O2 sensor switch/index ratio > 0.50 for E10 to > 0.90 for E85 (flex fuel vehicles)FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 6 OF 131