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
$&&> %$> );;Transmission Range SensorThe Non-contacting Pulse Width Modulated Transmission Range Sensor (TRS) provides a duty cycle signal foreach position. This signal is transmitted at a frequency of 125 Hz. The PCM decodes the duty cycle to determinethe driver-selected gear position (Park, Rev, Neutral, OD, 3, 2, 1). This input device is checked for out of rangefrequency, low duty cycle and high duty cycle input signals. (P0706, P0707, P0708)Speed SensorsThe Turbine Shaft Speed (TSS) sensor, Intermediate Shaft Speed (ISS) sensor and Output Shaft Speed (OSS)sensor, if equipped, are hall effect inputs that are checked for rationality. The vehicle speed signal is provided fromthe ABS system to the PCM. If the engine rpm is above the torque converter stall speed and engine load is high, itcan be 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 TSS sensor, a malfunction is indicated (P0715). If there isinsufficient output from the ISS sensor, a malfunction is indicated (P0791). If there is insufficient output from theOSS sensor, a malfunction is indicated (P0720).Transmission Fluid Temperature5R110W has a feature called "Cold mode". If TFT is below 0 deg F, the transmission will limit operation to 1 st , 2 nd ,3 rd , and 4 th gears (5 th and 6 th gears are disabled). Cold mode remains in effect until TFT rises above 0 deg F orvehicle operation (based on shift times or heat generated by driving) indicates that TFT should not be in the coldmode range, at which point normal operation is enabled.Direct clutch apply times cold have forced the addition of this cold mode (DC takes excessive times to apply below–10 deg F), and require revisions to TFT failure management – if TFT is failed at start up the transmission will beplaced in cold mode and remain there until TFT is no longer failed and above 0 deg F or the vehicle operatingconditions listed above trigger an exit from cold mode.Once out of cold mode a TFT failure will not trigger cold mode (can only go into cold mode once/power-up); but thismode is new to 5R110W.TFT is monitored for circuit faults (P0712, P0713) and in-range failures (P0711)For this reason all TFT diagnostics illuminate the MIL on 5R110W.;Shift SolenoidsThe Shift Solenoid (SSA, SSB, SSC, SSD, and SSE) output circuits are checked for opens and shorts by the PCMby monitoring the status of a feedback circuit from the output driver (SSA P0750, P0973, P0974; SSB P0755,P0976, P0977; SSC P0760, P0979, P0980; SSD P0765, P0982, P0983; SSE P0770, P0985, P0986).The shift solenoids will be tested for function. This is determined by vehicle inputs such as gear command, andgear. Shift solenoid malfunction codes actually cover the entire clutch system (using ratio there is no way to isolatethe solenoid from the rest of the clutch system. Diagnostics will isolate the fault into clutch functionally (nonelectrical)failed off (SSA P0751, SSB P0756, SSC P0761, SSD P0766, SSE P0771) and clutch functionally failedon (SSA: P0752, SSB: P0757, SSC: P0762, SSD: P0767, SSE: P0772). These fault codes replace the P2700level clutch fault codes previously used since the additional information of the failed state of the clutch adds valuefor service.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 116 OF 131
Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically for opens andshorts internally in the PCM by monitoring the status of a feedback circuit from the output driver (P0740, P0742,P0744).The TCC solenoid is checked functionally by evaluating torque converter slip under steady state conditions whenthe torque converter is fully applied. If the slip exceeds the malfunction thresholds when the TCC is commandedon, a TCC malfunction is indicated (P0741).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), a high side switch will be opened. This switch removes power from all 7 VFS's, providing Park, Reverse,Neutral, and 5M (in all forward ranges) with maximum line pressure based on manual lever position. This solenoidis tested for open (P0960), short to ground (P0962), and short to power (P0963) malfunctions.High Side Switch5R110W has a high side switch that can be used to remove power from all 7 VFS's simultaneously. If the high sideswitch is opened, all 7 solenoids will be electrically off, providing Park, Reverse, Neutral, and 5M (in all forwardranges) with maximum line pressure based on manual lever position. The switch is tested for open faults (switchfailed closed will provide normal control). If the switch fails, a P0657 fault code will be stored.CAN Communications errorThe TCM receives critical information from the ECM via CAN. If the CAN link fails, the TCM no longer has torqueor engine speed information available – the high side switch will be opened. The TCM will store a U0100 fault codeif unable to communicate with the TCM.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 117 OF 131
- 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 112 and 113: Direct One Way ClutchThe Direct One
- Page 114 and 115: Direct One Way ClutchThe Direct One
- 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
Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically <strong>for</strong> opens andshorts internally in the PCM by monitoring the status of a feedback circuit from the output driver (P0740, P0742,P0744).The TCC solenoid is checked functionally by evaluating torque converter slip under steady state conditions whenthe torque converter is fully applied. If the slip exceeds the malfunction thresholds when the TCC is commandedon, a TCC malfunction is indicated (P0741).Electronic Pressure ControlThe EPC solenoid is a variable <strong>for</strong>ce 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), a high side switch will be opened. This switch removes power from all 7 VFS's, providing Park, Reverse,Neutral, and 5M (in all <strong>for</strong>ward ranges) with maximum line pressure based on manual lever position. This solenoidis tested <strong>for</strong> open (P0960), short to ground (P0962), and short to power (P0963) malfunctions.High Side Switch5R110W has a high side switch that can be used to remove power from all 7 VFS's simultaneously. If the high sideswitch is opened, all 7 solenoids will be electrically off, providing Park, Reverse, Neutral, and 5M (in all <strong>for</strong>wardranges) with maximum line pressure based on manual lever position. The switch is tested <strong>for</strong> open faults (switchfailed closed will provide normal control). If the switch fails, a P0657 fault code will be stored.CAN Communications errorThe TCM receives critical in<strong>for</strong>mation from the ECM via CAN. If the CAN link fails, the TCM no longer has torqueor engine speed in<strong>for</strong>mation available – the high side switch will be opened. The TCM will store a U0100 fault codeif unable to communicate with the TCM.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 117 OF 131
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