OBD Operation Summary for Fiesta - MotorCraftService.com

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Downstream Oxygen Sensor MonitoringThe downstream oxygen sensor circuit monitor detects the HO2S sensor voltage is above or below a calibratablethreshold or if it is not active, stuck at some voltage.The downstream oxygen sensor monitor detects if the HO2S signal circuit voltage is shorted to ground (low signal),signal circuit voltage is high (high signal), or an open circuit causing the signal circuit voltage to be inactive or stuck atsome voltage.Sensor signal plausibility and signal activity monitoring is performed during coasting conditions during fuel cut-off(Slow Response). A malfunction is also detected, if the sensor signal is permanently above the minimumthreshold.Downstream HO2S Circuit CheckStartNoMonitoring Conditions?YesYesVLS_DOW N > .35 Volt.ThresholdorVLS_DOW N < .5 Volt.ThresholdorVLS_DOW N stayspermanently within small VoltageW indowNoO2 Sensors O.K.Error Counter IncrementError C ounter D ec rem entLow Lim it = 0NoError Counter > = Threshold ?Y esO2 SensorSensor Connection Malfunction- Signal Line Short to Battery Voltage- Signal Line Short to Ground- Signal Line BreakFault Proces singCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 48 OF 111
HO2S12 circuit check operation:DTCs P0136 – HO2 circuit (Bank 1, Sensor 2).P0137 – HO2 circuit low voltage (Bank 1, Sensor 2).P0138 – HO2 circuit high voltage (Bank 1, Sensor 2).P2A01 – O2 Sensor Circuit Range/Performance (Bank 1 Sensor 2).Monitor execution ContinuousMonitor Sequence NoneSensors OK HO2S, HO2 heater, MAFMonitoring Duration 12.7, 25.5 or 105 seconds to register a malfunctionTypical HO2S12 DFSO check entry conditions:Entry condition Minimum MaximumStuck above lean voltage limit (P0136 only)Stuck below rich voltage limit (P0136 only)Time stuck (P0136 only)0.35 volts5 secondsExhaust gas temp (P0136 only) 350 °CTime since entry conditions meet (P0136 only)Mass Air Flow (P0137 only)Time stuck at low voltage (P0137 only)Time stuck at high voltage (P0132 only)Oxygen sensor voltage for activation of DFCO test (P2A01 only)Integrated Mass Air Flow to start DFCO monitor (P2A01 only)Integrated Mass Air Flow to enter DFCO monitor (P2A01 only)Integrated Mass Air Flow to exit DFCO monitor (P2A01 only)Integrated Mass Air Flow during DFCO monitor > Integrated MassAir Flow from previous DFCO monitor (P2A01 only)100 sec12 kg/hr25.5 sec12.7 seconds0.601 V500 g20 g0.5 volts150 gCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 49 OF 111
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OBD Operation Summary for Fiesta - MotorCraftService.com

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