OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

Reductant Pressure Sensor Signal Range CheckReductant Pressure Sensor Open/Short Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP204C - Reductant Pressure Sensor Circuit LowP204D - Reductant Pressure Sensor Circuit HighContinuousnonenone0.4 seconds to register a malfunctionTypical Reductant Pressure Sensor Check Malfunction Thresholds:Pressure sensor voltage < 0.20 volts or Pressure sensor voltage > 4.8 voltsA reductant Pressure Sensor that is substantially in error results in a DEF system fault (over or under injection). Ifactual DEF pressure exceeds measured pressure, more DEF than that which would be expected is injected andvice versa. This error would show up in the long term adaption trim (DEF LTA).Reductant Pressure Plausibility Check before Start-upIf the hydraulic circuit of the DEF system (pump, pressure line, & injector) is completely empty, i.e. purge cycle wassuccessfully completed during previous drive cycle, the DEF pressure is expected to read 0 kPa.Based on sensor tolerances the deviation from zero is limited to 30 kPa.Reductant Pressure Plausibility Check Operation:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP204B (SRC error for Reductant Pressure Sensor)Continuous, prior to pressure build-upP204B is inhibited by active P204C or P204D codesnone0.6 seconds to register a malfunctionTypical Reductant Pressure Plausibility Check Entry Conditions:Entry Condition Minimum MaximumDEF pump and line not primed 0DEF system not pressurizedDEF tank and pump not frozenTrueTypical Reductant Pressure Plausibility Check Malfunction Thresholds:P204B: > 30 kPa for 0.6 secFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 100 OF 157