OBD Operation Summary for Fiesta - MotorCraftService.com

Barometric Pressure SensorThe purpose of the diagnosis shall be to detect electrical faults as defined by OBD I requirements.The signal of the altitude pressure sensor on the A/D-input of the microcontroller is checked.Barometric Pressure Sensor Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP2227 – Barometric Pressure Sensor "A" Circuit Range/PerformanceP2228 – Barometric Pressure Sensor "A" Circuit LowP2229 – Barometric Pressure Sensor "A" Circuit HighContinuous within entry conditionsNoneTP, MAF, ECT, ambient pressure, supply voltage, VS5 secondsTypical Barometric Pressure Sensor check entry conditions:Entry Condition Minimum MaximumIgnition “ON”Engine runningVehicle speed0 mphEngine at Idle (closed throttle)Mass air flowIntake manifold pressure99.9 kPaEngine Coolant Temperature -48 °CTypical Barometric Pressure Sensor functional check malfunction thresholds:P2227BARO gradient (Table Based on vehicle speed): > 0 kPa/s ORBARO from last driving cycle minus BARO @engine start): > 540 kPa -ANDmassair flow calculated from BARO sensor minus mass air flow): > 2047 kg/hP2228Short to ground or open circuit: ≤ 0.85 VP2229Short to battery: ≥ 4.50 VCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 98 OF 111