2002 MY OBD-II System Operation Summary - MotorCraftService.com

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PCV System MonitorFord plans to comply with the PCV monitoring requirements by modifying the current PCV system design. ThePCV valve will be installed into the rocker cover using a quarter-turn cam-lock design to prevent accidentaldisconnection. High retention force molded plastic lines will be used from the PCV valve to the intake manifold.The diameter of the lines and the intake manifold entry fitting will be increased so that inadvertent disconnectionof the lines after a vehicle is serviced will cause either an immediate engine stall or will not allow the engine to berestarted. Some vehicles will incorporate such designs beginning in the 2001 MYThermostat MonitorFord plans to comply with the thermostat monitoring requirement by using a slightly-modified version of thecurrent “Insufficient temperature for closed-loop” test (P0125). (See CCM description below.)If the engine is being operated in a manner that is generating sufficient heat, the engine coolant temperature(ECT) or cylinder head temperature (CHT) should warm up in a predictable manner. A timer is incremented whilethe engine is at moderate load and vehicle speed is above a calibrated limit. The target/minimum timer value isbased on ambient air temperature at start-up. If the timer exceeds the target time and ECT/CHT has not warmedup to the target temperature, a malfunction is indicated. The test runs if the start-up IAT temperature is below thetarget temperature. A 2-hour engine-off soak time is required to erase a pending or confirmed DTC. This featureprevents false-passes where engine coolant temperature rises after the engine is turned off during a shortengine-off soak.The target temperature is calibrated to the thermostat regulating temperature minus 20 o F. For a typical 195 o Fthermostat, the warm-up temperature would be calibrated to 175 o F. This test is being phased in starting in the2000 MY. A vehicle which is not part of the thermostat monitor phase-in utilizes a 140 o F warm-up temperature.Insufficient Temperature for Closed Loop Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0125once per driving cyclenone300 to 800 seconds within test entry conditions, based on ambient temperatureTypical P0125 check entry conditions:Entry Condition Minimum MaximumVehicle speed15 mphIntake Air Temp at Start-up 20 o F Target ECT temp.Engine Load 30%Engine off (soak) time to clear pending/confirmed DTC2 hoursTypical P0125 check malfunction thresholds:Time period expired without reaching 175 o F target ECT temperature.Time period is 300 to 800 seconds based on ambient temperature at start-up.FORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 38 OF 66
Comprehensive Component Monitor - EngineEngine InputsAnalog inputs such as Intake Air Temperature (P0112, P0113), Engine Coolant Temperature (P0117, P0118),Cylinder Head Temperature (P1289. P1290), Mass Air Flow (P0102, P0103) and Throttle Position (P0122, P0123,P1120), Fuel Temperature (P0182, P0183) are checked for opens, shorts, or out-of-range values by monitoring theanalog -to-digital (A/D) input voltage.Analog Sensor Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP0112, P0113, P0117, P0118, P0102, P0103, P0122, P0123, P1289, P1290continuousnonenot applicable5 seconds to register a malfunctionTypical analog sensor check malfunction thresholds:Voltage < 0.20 volts or voltage > 4.80 voltsThe MAF and TP sensors are cross-checked to determine whether the sensor readings are rational andappropriate for the current operating conditions. (P1121/P0068)MAF/TP Rationality Check Operation:DTCsMonitor executionMonitor SequenceSensors OKMonitoring DurationP1121 or P0068ContinuousNone3 seconds within test entry conditionsTypical MAF/TP rationality check entry conditions:Entry Condition Minimum MaximumEngine RPM 1000 rpm minimum of 3800 rpmEngine Coolant Temp100 o FTypical MAF/TP rationality check malfunction thresholds:Load > 60% and TP < 2.4 voltsLoad < 30% and TP > 2.4 voltsFORD MOTOR COMPANY REVISION DATE: OCTOBER 02, 2001 PAGE 39 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: Typical EGR flow check entry condit
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 and 50: Torque Converter Clutch Check Opera
Page 51 and 52: 4R70W (RWD) Transmission(no turbine
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

2002 MY OBD-II System Operation Summary - MotorCraftService.com

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