2002 MY OBD-II System Operation Summary - MotorCraftService.com
2002 MY OBD-II System Operation Summary - MotorCraftService.com 2002 MY OBD-II System Operation Summary - MotorCraftService.com
Electronic Pressure Control Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1747 electrical,P1789, P0797 (some applications) short to ground (lowpressure)P0745, P0775, P0795 mechanical functional (someapplications)continuousnoneElectrical: 5 seconds,Mechanical functional: up to 30 secondsTypical Electronic Pressure Control mechanical functional check entry conditions:Entry Conditions Minimum MaximumGear ratio calculatedeach gearTransmission Fluid Temperature 70 o F 225 o FThrottle Positionpositive drive torqueTypical EPC malfunction thresholds:Electrical check:Current feedback circuit is less than commanded current for 5 secondsMechanical functional check:Actual obtained gear pattern indicates EPC faultInductive Signature Chip Communication Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1636 loss of communicationoff-to-on solenoid transitionsnone< 100 solenoid eventsTypical Inductive Signature Chip Communication Check entry conditions:Entry Conditions Minimum MaximumTransmission Fluid Temp 70 o F 225 o FSolenoid commanded off duration< 2 secondsTypical Inductive Signature Communication Chip malfunction thresholds:Checksum error, chip not respondingFORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 50 OF 66
4R70W (RWD) Transmission(no turbine speed sensor)Transmission InputsThe Digital Transmission Range (DTR) sensor provides a single analog and three digital inputs to the PCM. ThePCM decodes the inputs to determine the driver-selected gear position (Park, Rev, Neutral, OD, 2, 1). This inputdevice is checked for opens and invalid input patterns. (P0708 P0705)The Vehicle Speed Sensor (VSS) and Output Shaft Speed (OSS) sensor, if equipped, are inputs that arechecked for rationality. If the engine rpm is above the torque converter stall speed and engine load is high, it canbe inferred that the vehicle must be moving. If there is insufficient output from the VSS sensor, a malfunction isindicated (P0500). If there is insufficient output from the OSS sensor, a malfunction is indicated (P0720).Transmission OutputsShift SolenoidsThe Shift Solenoid (SSA and SSB) output circuits are checked for opens and shorts by the PCM by monitoringthe status of a feedback circuit from the output driver (P0750 SSA, P0755 SSB).All vehicle applications will utilize an inductive signature circuit to monitor the shift solenoids functionally. The ISIGcircuit monitors the current signature of the shift solenoid as the solenoid is commanded on. A solenoid thatfunctions properly will show a characteristic decrease in current as the solenoid starts to move. If the solenoid ismalfunctioning, the current will not change (P1714 SSA, P1715 SSB). The lack of communication between theISIG chip and the PCM microprocessor is also monitored (P1636).Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically for opensand shorts by the PCM by monitoring the status of a feedback circuit from the output driver (P0743).All vehicle applications will utilize an inductive signature circuit to monitor the torque converter clutch. The ISIGcircuit monitors the current signature of the TCC solenoid as the solenoid is commanded on. A solenoid thatfunctions properly will show a characteristic decrease in current as the solenoid starts to move. If the solenoid ismalfunctioning, the current will not change (P1740) . In some applications, the ISIG test is run in conjunction withthe other transmission functional tests. The lack of communication between the ISIG chip and the PCMmicroprocessor is also monitored (P1636).Electronic Pressure ControlThe EPC solenoid is a variable force solenoid that controls line pressure in the transmission. The EPC solenoidhas a feedback circuit in the PCM that monitors EPC current. If the current indicates a short to ground (lowpressure), engine torque may be reduced to prevent damage to the transmission. (P1747, PCA)FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 51 OF 66
- Page 2: 4R70W (RWD) Transmission ..........
- Page 6 and 7: TYPICAL INDEX RATIO CATALYST MONITO
- Page 8 and 9: Misfire MonitorThere are two differ
- Page 10 and 11: Misfire Monitor Operation:DTCsMonit
- Page 12 and 13: AIR System MonitorThe secondary air
- Page 14 and 15: leed-up criteria is exceeded on thr
- Page 16 and 17: EVAP System Monitor - 0.020” dia.
- Page 18 and 19: Ford’s 0.020” evaporative syste
- Page 20 and 21: Typical 0.020” EVAP abort (fuel s
- Page 22 and 23: Additional malfunctions that are be
- Page 24: HO2S MonitorFront HO2S SignalThe ti
- Page 27 and 28: HO2S Heaters, front and rearThe HO2
- Page 29 and 30: In the 2002 MY, Ford will introduce
- Page 31 and 32: After the vehicle is started, durin
- Page 33 and 34: Finally, the differential pressure
- Page 35 and 36: EGR flow is monitored using an anal
- Page 37 and 38: Typical EGR flow check entry condit
- Page 39 and 40: Comprehensive Component Monitor - E
- Page 41 and 42: Ignition System Check Operation:DTC
- Page 43 and 44: The Intake Manifold Runner Control
- Page 45 and 46: Most vehicle applications no longer
- Page 47 and 48: Transmission Fluid Temperature Sens
- Page 49: Torque Converter Clutch Check Opera
- Page 53 and 54: CD4E (FWD) Transmission(has turbine
- Page 55 and 56: 5R55E (RWD) Transmission(has turbin
- Page 57 and 58: Direct One Way ClutchThe Direct One
- Page 59 and 60: Direct One Way ClutchThe Direct One
- Page 61 and 62: 4F27E (FN) (FWD) Transmission(has t
- Page 63 and 64: Exponentially Weighted Moving Avera
- Page 65 and 66: I/M Readiness CodeThe readiness fun
Electronic Pressure Control Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1747 electrical,P1789, P0797 (some applications) short to ground (lowpressure)P0745, P0775, P0795 mechanical functional (someapplications)continuousnoneElectrical: 5 seconds,Mechanical functional: up to 30 secondsTypical Electronic Pressure Control mechanical functional check entry conditions:Entry Conditions Minimum MaximumGear ratio calculatedeach gearTransmission Fluid Temperature 70 o F 225 o FThrottle Positionpositive drive torqueTypical EPC malfunction thresholds:Electrical check:Current feedback circuit is less than <strong>com</strong>manded current for 5 secondsMechanical functional check:Actual obtained gear pattern indicates EPC faultInductive Signature Chip Communication Check <strong>Operation</strong>:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1636 loss of <strong>com</strong>municationoff-to-on solenoid transitionsnone< 100 solenoid eventsTypical Inductive Signature Chip Communication Check entry conditions:Entry Conditions Minimum MaximumTransmission Fluid Temp 70 o F 225 o FSolenoid <strong>com</strong>manded off duration< 2 secondsTypical Inductive Signature Communication Chip malfunction thresholds:Checksum error, chip not respondingFORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 50 OF 66
Change language