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
Urea HeatersAqueous urea water solution (Diesel Exhaust Fluid) freezes at -11°C (12 deg. F). In order to keep the fluid liquid atlow ambient temperatures, the system includes 3 heaters:tank heater (PTC heater element – self regulating)pump heater (PTC heater element – self regulating)pressure line heater (Resistance heater)The heater power stages are located in the glow plug control module (GPCM). The tank heater is connected toheater power stage #1. The pressure line & pump heater are connected in parallel to heater power stage #2.All SCR-heater related circuit checks are performed inside the GCU. The information is sent via CAN to the enginecontrol module (ECM).Additionally the GCU sends the supply voltage and the actual heater current for each circuit to the ECM.Based on this information the heater plausibility checks are performed on the ECM.FORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 126 OF 157
Reductant Heater Plausibility ChecksBased on the information of heater voltage and heater current, the actual conductance at peak power is calculatedfor each heater circuit. This value is checked against the nominal value including tolerances.Typical characteristic of PTC heater conductance:Reductant Heater Plausibility Check Operation:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20BA – Reductant Heater "A" Control PerformanceP20BE – Reductant Heater "B" Control PerformanceOnce per drive cycle (at peak heater power)P20B9, P20BB, P20BC must complete for P20BAP20BD, P20BF, P20C0 must complete for P20BEnone1 event for fault detectionTypical Reductant Heater Plausibility Check Malfunction Thresholds:P20BA: > nominal conductance of heater circuit #1 + max. tolerance or< nominal conductance of heater circuit #1 – max. toleranceP20BE: > nominal conductance of heater circuit #2 + max. tolerance or< nominal conductance of heater circuit #2 – max. toleranceFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 127 OF 157
- Page 76 and 77: Ambient Air Temperature (AAT) Senso
- 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 124 and 125: Reverting ValveIn order to reverse
- Page 128 and 129: Additional plausibility check for h
- Page 130 and 131: Engine Control Unit (ECU) Monitor O
- Page 132 and 133: Typical Engine Control Unit (ECU) M
- Page 134 and 135: Lack of Communication Codes:CAN Com
- Page 136 and 137: Glow PlugsThe diesel engine uses gl
- Page 138 and 139: Glow Plug Circuit Open Load Check O
- Page 140 and 141: Glow Plug Circuit Resistance Out of
- Page 142 and 143: Miscellaneous ECU Errors:VID Block
- Page 144 and 145: Most vehicle applications no longer
- Page 146 and 147: Transmission Fluid Temperature Sens
- Page 148 and 149: Shift Solenoid Functional Check Ope
- Page 150 and 151: Pressure Control Solenoid Check Ope
- Page 152 and 153: Transmission OutputsShift Solenoids
- Page 154 and 155: On Board Diagnostic ExecutiveThe On
- Page 156 and 157: I/M Readiness CodeThe readiness fun
Reductant Heater Plausibility ChecksBased on the in<strong>for</strong>mation of heater voltage and heater current, the actual conductance at peak power is calculated<strong>for</strong> each heater circuit. This value is checked against the nominal value including tolerances.Typical characteristic of PTC heater conductance:Reductant Heater Plausibility Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors/Actuators OKMonitoring DurationP20BA – Reductant Heater "A" Control Per<strong>for</strong>manceP20BE – Reductant Heater "B" Control Per<strong>for</strong>manceOnce per drive cycle (at peak heater power)P20B9, P20BB, P20BC must <strong>com</strong>plete <strong>for</strong> P20BAP20BD, P20BF, P20C0 must <strong>com</strong>plete <strong>for</strong> P20BEnone1 event <strong>for</strong> fault detectionTypical Reductant Heater Plausibility Check Malfunction Thresholds:P20BA: > nominal conductance of heater circuit #1 + max. tolerance or< nominal conductance of heater circuit #1 – max. toleranceP20BE: > nominal conductance of heater circuit #2 + max. tolerance or< nominal conductance of heater circuit #2 – max. toleranceFORD MOTOR COMPANY REVISION DATE: FEBRUARY 9, 2012 09.01.00.02-PAGE 127 OF 157
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