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 shift solenoids are monitored functionally through gear ratio monitoring (P0731 for 1 st gear, P0732 for 2 nd gear,P0733 for 3 rd gear, P0734 for 4 th gear, P0735 for 5 th gear, and P0729 for 6 th gear), or if the drive range is failed toNeutral (P1700 fault code).Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is checked for short to power (P2763), open/short to ground(P2764) and stuck control current (P2762) by monitoring the status of a feedback circuit from the output driver.The TCC solenoid is also functionally monitored for stuck on and stuck off malfunctions. If the TCC is failed onwhen commanded off, engine rpm will drop to zero during a drive engagement or when coming to a stop and aP2758 fault code will be stored. If the TCC is failed off when commanded on, excessive slip (>100 rpm) will occurand a P2757 fault code will be stored.Pressure Control SolenoidThe Pressure Control Solenoid (PCA, controls line pressure) output circuit is checked for short to power (P0963)open/short to ground (P0962) and stuck control current (P0961) by monitoring the status of a feedback circuit fromthe output driver.;!%;!)The TCM monitors itself by using various software monitoring functions. The flash ROM is checked using achecksum calculation. If the checksum is incorrect during initialization, a P0601 fault will be stored. The EEPROMis emulated in the flash ROM. If it is not possible to store information in the EEPROM emulation or if the verificationfails, a P0603 fault is stored and the ECM is requested to illuminate the MIL immediately. If a RAM Read/Writeerror is detected during initialization, a P0604 fault code will be stored.CAN Communications errorThe TCM receives information from the ECM via CAN. If the CAN link fails the TCM no longer has torque orengine speed information available. The TCM will store a U0073 fault code if the CAN Bus is off. The TCM willstore a U0100 fault code if it doesn’t receive any more CAN messages from the ECM. Fault codes will be stored ifthe ECM received invalid/faulted information for the following CAN message items: Engine Torque (P2544),Engine Speed (P1920), and pedal position (P1576).The TCM receives wheel speed from the Antilock Brake System (ABS) module, a U0121 fault code will be stored ifcommunication with the ABS module is lost. If the wheel speed signal is invalid or failed, a U0415 fault code will bestored.Power SupplyIf the power supply is outside of the specified 9 to 18 volt range, a fault will be stored (P0562, P0563).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 126 OF 131
*6The On-Board Diagnostic (OBD) Executive is a portion of the PCM strategy that manages the sequencingand execution of all diagnostic tests. It is the "traffic cop" of the diagnostic system. Each test/monitor can beviewed as an individual task, which may or may not be able to run concurrently with other tasks. TheDiagnostic Executive enables/disables OBD monitors in order to accomplish the following:• Sequence the OBD monitors such that when a test runs, each input that it relies upon has alreadybeen tested.• Controls and co-ordinates the execution of the individual OBD system monitors: Catalyst, Misfire,EGR, O2, Fuel, AIR, EVAP and, Comprehensive Component Monitor (CCM).• Stores freeze frame and "similar condition" data• Manages storage and erasure of Diagnostic Trouble Codes as well as MIL illumination• Controls and co-ordinates the execution of the On-Demand tests: Key On Engine Off (KOEO), KeyOn Engine Running (KOER), and the Output Test Mode (OTM).• Performs transitions between various states of the diagnostic and powertrain control system tominimize the effects on vehicle operation.• Interfaces with the diagnostic test tools to provide diagnostic information (I/M readiness, various J1979 testmodes) and responds to special diagnostic requests (J1979 Mode 08 and 09).The diagnostic also executive controls several overall, global OBD entry conditions.• The Diagnostic Executive waits for 4 seconds after the PCM is powered before initiating any OBDmonitoring. For the 2001 MY and beyond, this delay has been eliminated to meet the "zero startup delay"misfire monitoring requirements.• The engine must be started to initiate a driving/monitoring cycle.• The Diagnostic Executive suspends OBD monitoring when battery voltage falls below 11.0 volts.• The Diagnostic Executive suspends monitoring of fuel-system related monitors (catalyst, misfire, evap,O2, AIR and fuel system) when fuel level falls below 15%The diagnostic executive controls the setting and clearing of pending and confirmed DTCs.• For the 2005 MY, pending DTCs will be displays as long as the fault is present. Note that OBD-IIregulations required a complete fault-free monitoring cycle to occur before erasing a pending DTC. Inpractice, this means that a pending DTC is erased on the next power-up after a fault-free monitoring cycle.• For clearing comprehensive component monitoring (CCM) pending DTCs, the specific monitor mustdetermine that no fault is present, and a 2-hour engine off soak has occurred prior to starting the vehicle.The 2-hour soak criteria for clearing CCM confirmed and pending DTCs has been utilized since the 2000MY.FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 127 OF 131
- 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 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 128 and 129: *> #606Exponentially Weighted Movin
- Page 130 and 131: @$!The readiness function is implem
The shift solenoids are monitored functionally through gear ratio monitoring (P0731 <strong>for</strong> 1 st gear, P0732 <strong>for</strong> 2 nd gear,P0733 <strong>for</strong> 3 rd gear, P0734 <strong>for</strong> 4 th gear, P0735 <strong>for</strong> 5 th gear, and P0729 <strong>for</strong> 6 th gear), or if the drive range is failed toNeutral (P1700 fault code).Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is checked <strong>for</strong> short to power (P2763), open/short to ground(P2764) and stuck control current (P2762) by monitoring the status of a feedback circuit from the output driver.The TCC solenoid is also functionally monitored <strong>for</strong> stuck on and stuck off malfunctions. If the TCC is failed onwhen commanded off, engine rpm will drop to zero during a drive engagement or when coming to a stop and aP2758 fault code will be stored. If the TCC is failed off when commanded on, excessive slip (>100 rpm) will occurand a P2757 fault code will be stored.Pressure Control SolenoidThe Pressure Control Solenoid (PCA, controls line pressure) output circuit is checked <strong>for</strong> short to power (P0963)open/short to ground (P0962) and stuck control current (P0961) by monitoring the status of a feedback circuit fromthe output driver.;!%;!)The TCM monitors itself by using various software monitoring functions. The flash ROM is checked using achecksum calculation. If the checksum is incorrect during initialization, a P0601 fault will be stored. The EEPROMis emulated in the flash ROM. If it is not possible to store in<strong>for</strong>mation in the EEPROM emulation or if the verificationfails, a P0603 fault is stored and the ECM is requested to illuminate the MIL immediately. If a RAM Read/Writeerror is detected during initialization, a P0604 fault code will be stored.CAN Communications errorThe TCM receives in<strong>for</strong>mation from the ECM via CAN. If the CAN link fails the TCM no longer has torque orengine speed in<strong>for</strong>mation available. The TCM will store a U0073 fault code if the CAN Bus is off. The TCM willstore a U0100 fault code if it doesn’t receive any more CAN messages from the ECM. Fault codes will be stored ifthe ECM received invalid/faulted in<strong>for</strong>mation <strong>for</strong> the following CAN message items: Engine Torque (P2544),Engine Speed (P1920), and pedal position (P1576).The TCM receives wheel speed from the Antilock Brake <strong>System</strong> (ABS) module, a U0121 fault code will be stored ifcommunication with the ABS module is lost. If the wheel speed signal is invalid or failed, a U0415 fault code will bestored.Power SupplyIf the power supply is outside of the specified 9 to 18 volt range, a fault will be stored (P0562, P0563).FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 126 OF 131
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