OBD Operation Summary for Fiesta - MotorCraftService.com

More documents

Recommendations

Info

Throttle Actuator (ETC) (Controller Diagnosis)Ignition “ON”Start RoutineNoAdaptation NecessaryYesAdaptation RoutineYesNoYesAdaptation Conditions fulfilled1st check for Limp Home =OKEngine StartedNoYesSpring Test-Upper Position StopCheck- OKAdaptation Conditions fulfilled1 st Adaptation for limphome = OKNoYesYesYesNoSpring Test-Upper Position StopCheck- OKNoEngine StartedNo2 nd check for Limp Home =OKNoYesNoYes2 nd check for Limp Home =OKYesNoSpring Test-Upper PositionStop Check- OKNoYes2 nd check for Limp Home = OKNoYesAdaptation of Lower PositionStop Check- OKNoYes3 rd limp home check = OKNoYesENDEnd stop checkETC = OKFault Processing (ETC Diagnosis) Store DTCDiagnosis ENDETC = OKCONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 78 OF 111
Electronic Throttle Control (ETC) Motor Control CircuitThe ETC Motor Control Circuit diagnostics are able to detect a short circuit to power, a short circuit to ground and anopen circuit. The diagnostic is initialized after a module reset or a “Key ON”. After initialization (Key "ON"), the followingare all reset: The diagnostic conditions, the symptom, the counter, and the failure stored in the Error Management.The circuit diagnostics execute every 10 milliseconds and are continuous. A short circuit can only be detected when theH-bridge switches are open, so the condition for the each short circuit is calculated during all ranges of the PWM.The ETC motor control circuit diagnostic is activated between a battery voltage range. This is to eliminate false low limitvoltage detection. The deactivation threshold for the ETC motor control circuit diagnostic is typically calibrated to a lowvoltage.Spring check (start routine)This diagnostic checks if the throttle spring is working correctly and if the throttle limp home position can be achieved.The diagnostic is performed at the beginning of every driving cycle at ignition "Key ON" position. The throttle body springcheck is executed as part of the start routine and is carried out with every “Key ON” of the engine control unit. Morespecifically the spring check is run during the TPS adaptation routine. The routine includes the following:• Limp-home position check• Adaptation of the limp-home position• Upper return spring checkThe start routine is only carried out when the adaptation conditions are maintained, (Key "ON" / Engine Running). Thediagnostic will report when a spring-check error occurs, which includes the upper or lower return spring limits.There is a throttle position set-point, calibratable, used for the upper return spring check. The TPS set-point should beapproximately 10 ° greater than the limp-home position.After the adaptation of the lower mechanical stop, the set point is used for the lower return spring check. The objective isto adjust the throttle in a position between the lower limit and limp-home. Without this set point, the throttle could stick inthe lower mechanical stop after the adaptation. A typical value of 2 ° is recommended.ETC adaptation diagnosticAfter the initial engine start and / or component change, the characteristic Potentiometer values for the limp homeposition and the lower mechanical stop are learned within an adaptation routine. The values are stored at the end of thedriving cycle in the non-volatile memory. If the conditions are not fulfilled, the malfunction errors (DTC's) are stored.Due to the electrical and mechanical tolerances of the ETC system, the sensor characteristic has to be learned and theETC system controller must adapt. The TPS adaptation is executed as part of the start routine and is carried out the veryfirst time there is a “Key ON” of the engine control unit at the vehicle assembly plant or when the engine control unit ischanged in service.CONTINENTAL REVISED: SEPTEMBER 17, 2010 PAGE 79 OF 111
Page 1 and 2:
2011 MY OBD System OperationSummary
Page 3 and 4:
Knock Sensor.......................
Page 5 and 6:
In the example above, CATMN_IAF_SUM
Page 7 and 8:
Typical IAF catalyst monitor entry
Page 9 and 10:
Fault processing - Emission Thresho
Page 11 and 12:
Misfire Determination ProcessingCON
Page 13 and 14:
J1979 Misfire Mode $06 DataMonitor
Page 15 and 16:
.020" Leak Switch OpenTypical vehic
Page 17 and 18:
CONTINENTAL REVISED: SEPTEMBER 17,
Page 19 and 20:
NVLD II Module OperationNVLD II mod
Page 21 and 22:
Canister Purge Solenoid, switch and
Page 23 and 24:
Canister Purge valve Functional che
Page 25 and 26:
High Purge Flow Monitor Operation:D
Page 27 and 28: EVAP Pressure Switch Performance Mo
Page 29 and 30: NVLD II Communication Check Operati
Page 31 and 32: O2 sensor voltageSHRTFT, Short Term
Page 33 and 34: Fuel Monitor Adaption MonitoringErr
Page 35 and 36: Fuel Monitor Operation:DTCsMonitor
Page 37 and 38: Upstream HO2S Circuit CheckNoStartM
Page 39 and 40: HO2S11 circuit check operation:DTCs
Page 41 and 42: Upstream HO2S Slow Response CheckCO
Page 43 and 44: Up-Stream Oxygen Sensor Rationality
Page 45 and 46: Upstream Oxygen Sensor Heater Circu
Page 47 and 48: HO2S Heater Monitor Operation:DTCs
Page 49 and 50: HO2S12 circuit check operation:DTCs
Page 51 and 52: Downstream Oxygen Sensor Slow Respo
Page 53 and 54: Downstream HO2S12 Response Rate Ope
Page 55 and 56: Downstream HO2S12 Functional Check
Page 57 and 58: Downstream HO2S Heater Electrical C
Page 59 and 60: Thermostat MonitorThe coolant therm
Page 61 and 62: ECT Below Thermostat Regulating Tem
Page 63 and 64: Spark Timing MonitorWhen the CSER s
Page 65 and 66: Cold Start Emission Reduction Syste
Page 67 and 68: CSER Monitor OperationDTCMonitor Ex
Page 69 and 70: Variable Camshaft Timing Target Err
Page 71 and 72: Variable Cam Timing Slow ResponseSt
Page 73 and 74: Typical VVT Target Error/Slow Respo
Page 75 and 76: Camshaft/Crankshaft Position Correl
Page 77: Electronic Throttle ControlThe Elec
Page 81 and 82: Electronic Throttle Control (ETC) M
Page 83 and 84: Accelerator and Throttle Position S
Page 85 and 86: ECT Sensor Rationality Check Operat
Page 87 and 88: IAT Rationality TestThe IAT rationa
Page 89 and 90: Ambient Air Temperature Sensor Inpu
Page 91 and 92: Mass Air Flow Range PerformanceTTPS
Page 93 and 94: 5 Volt Sensor Reference Voltage A C
Page 95 and 96: Idle Speed Control MonitorThe Idle
Page 97 and 98: Knock SensorTwo basic diagnostic te
Page 99 and 100: Ignition CoilThe purpose of this di
Page 101 and 102: Crankshaft Position Sensor MonitorA
Page 103 and 104: Each clutch system consists of:•
Page 105 and 106: 3. Shift drum A motor - controls th
Page 107 and 108: The diagnostic executive controls t
Page 109 and 110: EWMA ExamplesEWMA with FIR and SCL
Page 111: Closed Loop Fuel Control Enable Con
show all

OBD Operation Summary for Fiesta - MotorCraftService.com

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?