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
Direct One Way ClutchThe Direct One Way Clutch is checked for functionality by utilizing a rationality test that looks at transmission inputtorque relative to commanded throttle position while in 1 st , 3 rd , or 4 th gear. If a direct one way clutch fault is present,then the transmission will not be able to carry torque at high throttle angles in 1 st , 3 rd , or 4 th gears. (P1700)FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 112 OF 131
$%$> );" #;!The 5R55S replaces the 5R55W transmission from 2002 MY. The diagnostics for the 5R55S and 5R55W areidentical. The controls are slightly different for vehicles that use Electronic Throttle Control (ETC) versus vehiclesthat do not use ETC.;The Digital Transmission Range (DTR) sensor provides a single analog and three digital inputs to the PCM. ThePCM decodes these inputs to determine the driver-selected gear position. This input device is checked for opensand invalid input patterns. (P0708, P0705)Turbine Shaft Speed (TSS) and Output Shaft Speed (OSS) sensors are analog inputs that are checked forrationality. If the engine rpm is above the torque converter stall speed and engine load is high, it can be inferredthat the vehicle must be moving. If there is insufficient output from the TSS sensor, a malfunction is indicated(P0715). If there is insufficient output from the OSS sensor, a malfunction is indicated (P0720).;Shift SolenoidsThe Shift Solenoid (SSA, SSB, SSC, SSD) output circuits are checked for opens and shorts by the PCM bymonitoring the status of a feedback circuit from the output driver (P0750 SSA, P0755 SSB, P0760 SSC, P0765SSD).These vehicle applications will utilize an inductive signature circuit to monitor the shift solenoids functionally. TheISIG circuit 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, P1716 SSC, P1717 SSD). The ISIG testruns in conjunction with the other transmission functional tests. The lack of communication between the ISIG chipand the PCM microprocessor is also monitored (P1636).Electronic Pressure Control OutputsThe VFS solenoids are variable force solenoids that control line pressure and gear selection in the transmission.The VFS solenoids have a feedback circuit in the PCM that monitors VFS current. If the current indicates a short toground (low pressure), engine torque may be reduced to prevent damage to the transmission. (P0962, P0966,P0970).The VFS solenoids are also checked for functionality by utilizing a rationality test that looks at gear ratios. IfVFS/shift solenoid electrical faults and shift solenoid ISIG faults are not present, then actual ratios versus expectedratios are used to infer VFS failures. (P0745 PCA, P0775 PCB, P0795 PCC)Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically for opens andshorts by the PCM by monitoring the status of a feedback circuit from the output driver (P0743).These 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). The ISIG test runs in conjunction with the other transmissionfunctional tests. The lack of communication between the ISIG chip and the PCM microprocessor is also monitored(P1636).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 113 OF 131
- Page 62 and 63: Note: BARO is inferred at engine st
- Page 64 and 65: $. 6The Electric Stepper Motor EGR
- Page 66 and 67: The MAP sensor is also checked for
- Page 68 and 69: When the entry conditions for the f
- Page 70 and 71: 1!2Ford plans to comply with the PC
- Page 72 and 73: ETC System Failure Mode and Effects
- Page 74 and 75: ;#11!%;11!)The purpose of the TPPC
- Page 76 and 77: Currently, vehicles use either an E
- Page 78 and 79: Fuel Rail Pressure Sensor Check Ope
- Page 80 and 81: Loss of Keep Alive Memory (KAM) pow
- Page 82 and 83: CKP Ignition System Check Operation
- Page 84 and 85: The Idle Air Control (IAC) solenoid
- Page 86 and 87: There are several different styles
- Page 88 and 89: The PCM continually calculates a ca
- Page 90 and 91: Most vehicle applications no longer
- Page 92 and 93: Intermediate Shaft Speed Sensor Fun
- Page 94 and 95: Primary Pulley Speed Sensor Functio
- Page 96 and 97: Secondary Pulley Pressure Sensor Ch
- Page 98 and 99: Typical Shift Solenoid mechanical f
- Page 100 and 101: Shift Completion Check Operation:DT
- Page 102 and 103: Pressure Control Solenoid Check Ope
- Page 104 and 105: Forward Clutch/Reverse Clutch Solen
- Page 106 and 107: 4$=%$> );4R70E is the replacement f
- Page 108 and 109: ! 4%:> );;The Analog Transmission R
- Page 110 and 111: $%$> );;The Digital Transmission Ra
- Page 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
- Page 130 and 131: @$!The readiness function is implem
$%$> );" #;!The 5R55S replaces the 5R55W transmission from 2002 <strong>MY</strong>. The diagnostics <strong>for</strong> the 5R55S and 5R55W areidentical. The controls are slightly different <strong>for</strong> vehicles that use Electronic Throttle Control (ETC) versus vehiclesthat do not use ETC.;The Digital Transmission Range (DTR) sensor provides a single analog and three digital inputs to the PCM. ThePCM decodes these inputs to determine the driver-selected gear position. This input device is checked <strong>for</strong> opensand invalid input patterns. (P0708, P0705)Turbine Shaft Speed (TSS) and Output Shaft Speed (OSS) sensors are analog inputs that are checked <strong>for</strong>rationality. If the engine rpm is above the torque converter stall speed and engine load is high, it can be inferredthat the vehicle must be moving. If there is insufficient output from the TSS sensor, a malfunction is indicated(P0715). If there is insufficient output from the OSS sensor, a malfunction is indicated (P0720).;Shift SolenoidsThe Shift Solenoid (SSA, SSB, SSC, SSD) output circuits are checked <strong>for</strong> opens and shorts by the PCM bymonitoring the status of a feedback circuit from the output driver (P0750 SSA, P0755 SSB, P0760 SSC, P0765SSD).These vehicle applications will utilize an inductive signature circuit to monitor the shift solenoids functionally. TheISIG circuit 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, P1716 SSC, P1717 SSD). The ISIG testruns in conjunction with the other transmission functional tests. The lack of communication between the ISIG chipand the PCM microprocessor is also monitored (P1636).Electronic Pressure Control OutputsThe VFS solenoids are variable <strong>for</strong>ce solenoids that control line pressure and gear selection in the transmission.The VFS solenoids have a feedback circuit in the PCM that monitors VFS current. If the current indicates a short toground (low pressure), engine torque may be reduced to prevent damage to the transmission. (P0962, P0966,P0970).The VFS solenoids are also checked <strong>for</strong> functionality by utilizing a rationality test that looks at gear ratios. IfVFS/shift solenoid electrical faults and shift solenoid ISIG faults are not present, then actual ratios versus expectedratios are used to infer VFS failures. (P0745 PCA, P0775 PCB, P0795 PCC)Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically <strong>for</strong> opens andshorts by the PCM by monitoring the status of a feedback circuit from the output driver (P0743).These 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). The ISIG test runs in conjunction with the other transmissionfunctional tests. The lack of communication between the ISIG chip and the PCM microprocessor is also monitored(P1636).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 113 OF 131