OBD Operation Summary for 6.7L Diesel - MotorCraftService.com

The control module consists of a microprocessor, RAM, ROM, EEPROM, Ip1 circuit, Ip2 circuit, Rpvs circuit,heater driver, and temperature sensor. The EEPROM stores sensor and controller module calibration coefficientsobtained during the manufacturing process. The Ip1 circuit consists of an ASIC (like that of a UEGO ASIC) thatadjusts pumping current in the sensing element’s Ip1 circuit for O2 detection. The Ip2 circuit adjusts the pumpingcurrent in the sensing element’s Ip2 circuit for NOx detection. The Ip2 circuit consists of 2 bands: a wide range anda narrow range. The Rpvs circuit is a measurement of the resistance of the Vs cell of the sensor element. Thismeasurement is used to estimate the temperature of the sensing element. The heater driver supplies a PWMvoltage to the heater portion of the sensing element to maintain the element’s target operational temperature. PIDfeedback from Rpvs is used to control and maintain the element temperature. The microprocessor processes all ofthe inputs from the sensing element and outputs to the CAN circuit. The temperature sensor in the controllermodule is used for compensating the temperature dependency of circuit components and for OBD rationalitychecks.The NOx controller module interfaces with the vehicle via a power, signal ground, power ground, and CAN. Thecompensated O2 concentration, compensated NOx concentration, Rpvs, pressure compensation factors,sensor/module OBD (including monitor completion flags), module temperature, software ID, CALID, and CVN arecommunicated via CAN to the vehicle PCM.NOx Controller Module MalfunctionsDTCs P06EA NOx Sensor Processor Performance (Bank 1 Sensor 1)Monitor executionMonitor SequenceSensors OKMonitoring DurationU05A1 NOx Sensor "A" Received Invalid Data From ECM/PCMP225A NOx Sensor Calibration Memory (Bank 1 Sensor 1)continuousIp2-N and Ip2-W range rationality – 50ppm < [NOx] < 100ppmnot applicable5 seconds to register a malfunctionTypical NOx Controller Malfunction ThresholdsP06EA RAM failure, ROM CRC check error or EEPROM CRC check errorIp1 out of range – Ip1(VIP2.1) < 1.8V, Ip1(VIP2.1) > 2.2 V, Ip1(VIP2.2) < 0.2 V, or Ip1(VIP2.2) > 0.6VIp2-W out of range – Vs+ ≥ 5.35V and Ip2-W > 4.8 VIp2-N out of range – Vs+ ≥ 5.35V and Ip2-N < 0.2 VIp2-N and Ip2-W range rationality – Integral value of differential between Ip2-N & Ip2-W ≥ 250 ppmVp2 circuit failure – Vp2 < 250mV or Vp2 > 650mVRpvs short to ground – Rpvs < 0.2VTemperature sensor short to battery > 4.5 VTemperature sensor short to ground < 0.45 VTemperature sensor open, between 0.45 V and < 0.48 VU05A1 Erroneous Signal (Dew point reached with ignition off, etc.)Timeout (>1 second before message received)P225A Calibration memory does not pass CRC checkFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 39 OF 157