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
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Additional plausibility check <strong>for</strong> heater circuit #2:Pump heater & pressure line heater are connected in parallel to heater power stage #2. In order to be able todetect a failure of just one of both heaters, the conductance of heater circuit #2 is continuously checked against aminimum threshold. E.g. if the pressure line heater gets disconnected after peak conductance occurred, neither theplausibility check nor the circuit checks inside the GCU can detect this error. There<strong>for</strong>e this continuous checkbe<strong>com</strong>es necessary.Reductant Heater Plausibility Check <strong>Operation</strong> (Heater Circuit #2):DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20BE – Reductant Heater "B" Control Per<strong>for</strong>manceContinuously, if heater “B” is activatedP20BD, P20BF, P20C0 must <strong>com</strong>plete <strong>for</strong> P20BEPressure line heater2200 ms <strong>for</strong> fault detectionTypical Reductant Heater Plausibility Check Malfunction Thresholds (Heater Circuit #2):P20BE: conductance of heater circuit #2 < 0.3 Ω -1FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 128 OF 157
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