2005 MY OBD System Operation Summary for Gasoline Engines
2005 MY OBD System Operation Summary for Gasoline Engines 2005 MY OBD System Operation Summary for Gasoline Engines
@$!The readiness function is implemented based on the J1979 format. A battery disconnection or clearing codesusing a scan tool results in the various I/M readiness bits being set to a “not-ready” condition. As each noncontinuousmonitor completes a full diagnostic check, the I/M readiness bit associated with that monitor is set to a“ready” condition. This may take one or two driving cycles based on whether malfunctions are detected or not.The readiness bits for comprehensive component monitoring, misfire and fuel system monitoring are consideredcomplete once all the non-continuous monitors have been evaluated. Because the evaporative system monitorrequires ambient conditions between 40 and 100 o F and BARO > 22.5 " Hg (< 8,000 ft.) to run, special logic can“bypass” the running the evap monitor for purposes of clearing the evap system I/M readiness bit due to thecontinued presence of these extreme conditions.6+&''=
!;A catalyst temperature model is currently used for entry into the catalyst and oxygen sensor monitors. Thecatalyst temperature model uses various PCM parameters to infer exhaust/catalyst temperature. For the 1998MY, the catalyst temperature model has been enhanced and incorporated into the Type A misfire monitoringlogic. The model has been enhanced to include a misfire-induced exotherm prediction. This allows the model topredict catalyst temperature in the presence of misfire.The catalyst damage misfire logic (Type A) for MIL illumination has been modified to require that both the catalystdamage misfire rate and the catalyst damage temperature is being exceeded prior to MIL illumination. Thischange is intended to prevent the detection of unserviceable, unrepeatable, burst misfire during cold engine startupwhile ensuring that the MIL is properly illuminated for misfires that truly damage the catalyst. ,/,The instrument cluster on some vehicles uses the J1850 serial data link or CAN data link to receive and displayvarious types of information from the PCM. For example, the engine coolant temperature information displayedon the instrument cluster comes from the same ECT sensor used by the PCM for all its internal calculations.These same vehicles use the J1850 serial data link or CAN data link to illuminate the MIL rather than a circuit,hard-wired to the PCM. The PCM periodically sends the instrument cluster a message that tells it to turn on theMIL, turn off the MIL or blink the MIL. If the instrument cluster fails to receive a message within a 5-secondtimeout period, the instrument cluster itself illuminates the MIL. If communication is restored, the instrumentcluster turns off the MIL after 5 seconds. Due to its limited capabilities, the instrument cluster does not generate orstore Diagnostic Trouble Codes.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 131 OF 131
- Page 80 and 81: Loss of Keep Alive Memory (KAM) pow
- Page 82 and 83: CKP Ignition System Check Operation
- Page 84 and 85: The Idle Air Control (IAC) solenoid
- Page 86 and 87: There are several different styles
- Page 88 and 89: The PCM continually calculates a ca
- Page 90 and 91: Most vehicle applications no longer
- Page 92 and 93: Intermediate Shaft Speed Sensor Fun
- Page 94 and 95: Primary Pulley Speed Sensor Functio
- Page 96 and 97: Secondary Pulley Pressure Sensor Ch
- Page 98 and 99: Typical Shift Solenoid mechanical f
- Page 100 and 101: Shift Completion Check Operation:DT
- Page 102 and 103: Pressure Control Solenoid Check Ope
- Page 104 and 105: Forward Clutch/Reverse Clutch Solen
- Page 106 and 107: 4$=%$> );4R70E is the replacement f
- Page 108 and 109: ! 4%:> );;The Analog Transmission R
- Page 110 and 111: $%$> );;The Digital Transmission Ra
- Page 112 and 113: Direct One Way ClutchThe Direct One
- Page 114 and 115: Direct One Way ClutchThe Direct One
- Page 116 and 117: $&&> %$> );;Transmission Range Sens
- Page 118 and 119: 4:=%:.)%:> );;The Transmission Rang
- Page 120 and 121: CFT 30 Mechatronic Illustration;Tra
- Page 122 and 123: Internal TCM Power SupplyIf the pow
- Page 124 and 125: shift, rpm does not go up during a
- Page 126 and 127: The shift solenoids are monitored f
- Page 128 and 129: *> #606Exponentially Weighted Movin
!;A catalyst temperature model is currently used <strong>for</strong> entry into the catalyst and oxygen sensor monitors. Thecatalyst temperature model uses various PCM parameters to infer exhaust/catalyst temperature. For the 1998<strong>MY</strong>, the catalyst temperature model has been enhanced and incorporated into the Type A misfire monitoringlogic. The model has been enhanced to include a misfire-induced exotherm prediction. This allows the model topredict catalyst temperature in the presence of misfire.The catalyst damage misfire logic (Type A) <strong>for</strong> MIL illumination has been modified to require that both the catalystdamage misfire rate and the catalyst damage temperature is being exceeded prior to MIL illumination. Thischange is intended to prevent the detection of unserviceable, unrepeatable, burst misfire during cold engine startupwhile ensuring that the MIL is properly illuminated <strong>for</strong> misfires that truly damage the catalyst. ,/,The instrument cluster on some vehicles uses the J1850 serial data link or CAN data link to receive and displayvarious types of in<strong>for</strong>mation from the PCM. For example, the engine coolant temperature in<strong>for</strong>mation displayedon the instrument cluster comes from the same ECT sensor used by the PCM <strong>for</strong> all its internal calculations.These same vehicles use the J1850 serial data link or CAN data link to illuminate the MIL rather than a circuit,hard-wired to the PCM. The PCM periodically sends the instrument cluster a message that tells it to turn on theMIL, turn off the MIL or blink the MIL. If the instrument cluster fails to receive a message within a 5-secondtimeout period, the instrument cluster itself illuminates the MIL. If communication is restored, the instrumentcluster turns off the MIL after 5 seconds. Due to its limited capabilities, the instrument cluster does not generate orstore Diagnostic Trouble Codes.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 131 OF 131
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