OBD Operation Summary for 6.7L Diesel - MotorCraftService.com
OBD Operation Summary for 6.7L Diesel - MotorCraftService.com OBD Operation Summary for 6.7L Diesel - MotorCraftService.com
Reverting ValveIn order to reverse the reductant flow direction (for line purge) a 4-2-way valve (reverting valve) needs to beswitched. The valve is switched by a solenoid.Reverting valveSolenoidFilterPumpReverting Valve Circuit Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP20A0 – Reductant Purge Control Valve Circuit / OpenP20A3 – Reductant Purge Control Valve Circuit HighP20A2 – Reductant Purge Control Valve Circuit LowContinuous – Open and Low with driver off / High with driver onnonenone2 seconds to register a malfunctionTypical Reverting Valve Circuit Check Malfunction Thresholds:Fault is determined by power stage driver.P20A0 – Reductant Purge Control Valve Circuit / Open - < 5.80 voltsP20A3 – Reductant Purge Control Valve Circuit High - > 2.20 ampsP20A2 – Reductant Purge Control Valve Circuit Low - < 3.50 voltsFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 124 OF 157
The reverting valve functional check monitors the pressure drop when the purge cycle is started. To run this testthe pressure level must exceed a calibration threshold (280 kPa) at beginning of test. For a successful test result,the pressure must drop by another threshold (230 kPa) within the time.If the test is not successfully passed the purge cycle will be terminated immediately because of the risk ofuncontrolled injection of reductant into the exhaust pipe.Reverting Valve Functional Check Operation:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20A1 - Reductant Purge Control Valve PerformancecontinuousP20A1 is inhibited by active P20A0 , P20A3 or P20A2reductant pump pressure sensor, reductant injector, reductantpump motor5 sec for fault detectionTypical Reverting Valve Functional Check Malfunction Thresholds:P20A1: initial pressure > 280 kPaMin. pressure drop < 230 kPa errorFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 125 OF 157
- Page 74 and 75: Engine SensorsAir Temperature Ratio
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- Page 78 and 79: Charge Air Cooler Temperature (CACT
- Page 80 and 81: EGR Cooler Downstream Temperature R
- Page 82 and 83: Barometric Pressure and Manifold Ab
- Page 84 and 85: Turbine Upstream Pressure Sensor Pl
- Page 86 and 87: EGR Valve Position SensorAnalog inp
- Page 88 and 89: Engine Coolant & Engine Oil Correla
- Page 90 and 91: Engine Oil Temperature (EOT) Sensor
- Page 92 and 93: Typical Camshaft and Crankshaft Sen
- Page 94 and 95: Typical Fan and Fan Speed Sensor Ch
- Page 96 and 97: MAF Rationality CheckA rationality
- Page 98 and 99: Mass Air Flow Sensor Plausibility C
- Page 100 and 101: Reductant Pressure Sensor Signal Ra
- Page 102 and 103: DEF System Pressure ControlDEF pres
- Page 104 and 105: Reductant Tank Level Sensor Circuit
- Page 106 and 107: Reductant Tank Temperature Circuit
- Page 108 and 109: Exhaust Gas Temperature Sensor Rati
- Page 110 and 111: Exhaust Gas Temperature Rationality
- Page 112 and 113: Diesel Particulate Filter Pressure
- Page 114 and 115: Typical Actuator Jammed Valve Entry
- Page 116 and 117: ECB Valve Actuator Signal Range Che
- Page 118 and 119: Reductant Pump MotorThe Reductant P
- Page 120 and 121: Reductant Pump Motor Circuit Checks
- Page 122 and 123: Reductant Dosing Valve Circuit Chec
- Page 126 and 127: Urea HeatersAqueous urea water solu
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- Page 132 and 133: Typical Engine Control Unit (ECU) M
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- Page 136 and 137: Glow PlugsThe diesel engine uses gl
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- Page 144 and 145: Most vehicle applications no longer
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The reverting valve functional check monitors the pressure drop when the purge cycle is started. To run this testthe pressure level must exceed a calibration threshold (280 kPa) at beginning of test. For a successful test result,the pressure must drop by another threshold (230 kPa) within the time.If the test is not successfully passed the purge cycle will be terminated immediately because of the risk ofuncontrolled injection of reductant into the exhaust pipe.Reverting Valve Functional Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20A1 - Reductant Purge Control Valve Per<strong>for</strong>mancecontinuousP20A1 is inhibited by active P20A0 , P20A3 or P20A2reductant pump pressure sensor, reductant injector, reductantpump motor5 sec <strong>for</strong> fault detectionTypical Reverting Valve Functional Check Malfunction Thresholds:P20A1: initial pressure > 280 kPaMin. pressure drop < 230 kPa errorFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 125 OF 157
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