2009款日产美版颐达Versa电子助力转向系统（EPS）维修手册（英文）（可编辑）

2009款日产美版颐达Versa电子助力转向系统（EPS）维修手册（英文）（可编辑） 2009款日产美版颐达Versa电子助力转向系统(EPS) 维修手册(英文) STEERING A SECTION STC B STEERING CONTROL SYSTEM C D CONTENTS E EPS EPS Terminal and Reference Value 10 F CONSULT-III Function EPS 11 SERVICE INFORMATION 2 Symptom Chart 13 STC PRECAUTIONS 2 TROUBLE DIAGNOSIS FOR SYSTEM 14 Precaution for Supplemental Restraint System DTC C1601 BATTERY VOLT 14 SRS "AIR BAG" and "SEAT BELT PRE-TEN- DTC C1604 TORQUE SENSOR 15 SIONER" 2 DTC C1606 EPS MOTOR 16 H Precaution Necessary for Steering Wheel Rota- DTC C1607 EEPROM 17 tion After Battery Disconnect 2 DTC C1608 CONTROL UNIT 17 Service Notice or Precaution for EPS System 3 DTC C1609 CAN VHCL SPEED 18 I DTC C1610 CAN ENG RPM 19 EPS SYSTEM 4 DTC U1000 CAN COMM CIRCUIT 19 System Description 4 Component Inspection 19 J Schematic 5 CAN Communication 5 TROUBLE DIAGNOSIS FOR SYMPTOMS 21 EPS Warning Lamp Does Not Turn ON 21 TROUBLE DIAGNOSIS 6 EPS Warning Lamp Does Not Turn OFF 21 K Fail-Safe Function 6 Steering Wheel Turning Force Is Heavy or Light 22 How to Perform Trouble Diagnosis 6 Unbalance Steering Wheel Turning Force and Re- Component Parts Location 7 turn Between Right and Left 23 L Wiring Diagram - EPS - 8 Unbalance Steering Wheel Turning Force Torque EPS Control Unit InputOutput Signal Reference Variation 24 Value 9 M N O P STC-1 PRECAUTIONS [EPS] SERVICE INFORMATION PRECAUTIONS Precaution for Supplemental Restraint System SRS "AIR BAG" and "SEAT BELT PRE-TENSIONER" INFOID0000000004778186 The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE-TENSIONER used along with a front seat belt helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision This system includes seat belt switch inputs and dual stage front air bag modules The SRS system uses the seat belt switches to determine the front air bag deployment and may only deploy one front air bag depending on the severity of a collision and whether the front occupants are belted or unbelted Information necessary to service the system safely is included in the SRS and SB section of this Service Man- ual WARNING To avoid rendering the SRS inoperative which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation all maintenance must be performed by an authorized NISSANINFINITI dealer Improper maintenance including incorrect removal and installation of the SRS can lead to personal injury caused by unintentional activation of the system For removal of Spiral Cable and Air Bag Module see the SRS section Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual SRS wiring harnesses can be identified by yellow andor orange harnesses or har- ness connectors PRECAUTIONS WHEN USING POWER TOOLS AIR OR ELECTRIC AND HAMMERS WARNING When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni- tion ON or engine running DO NOT use air or electric power tools or strike near the sensor s with a hammer Heavy vibration could activate the sensor s and deploy the air bag s possibly causing serious injury When using air or electric power tools or hammers always switch the Ignition OFF disconnect the battery and wait at least 3 minutes before performing any service Precaution Necessary for Steering Wheel Rotation After Battery Disconnect INFOID0000000004307285 NOTE This Procedure is applied only to models with Intelligent Key system and NVISIVIS NISSANINFINITI VEHICLE IMMOBILIZER SYSTEM - NATS Remove and install all control units after disconnecting both battery cables with the ignition knob in the 〃LOCK〃 position Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work If DTC is detected perform trouble diagnosis according to self-diagnostic results For models equipped with the Intelligent Key system and NVISIVIS an electrically controlled steering lock mechanism is adopted on the key cylinder For this reason if the battery is disconnected or if the battery is discharged the steering wheel will lock and steering wheel rotation will become impossible If steering wheel rotation is required when battery power is interrupted follow the procedure below before starting the repair operation OPERATION PROCEDURE 1 Connect both battery cables NOTE Supply power using jumper cables if battery is discharged 2 Use the Intelligent Key or mechanical key to turn the ignition switch to the 〃ACC〃 position At this time the steering lock will be released 3 Disconnect both battery cables The steering lock will remain released and the steering wheel can be rotated 4 Perform the necessary repair operation STC-2 PRECAUTIONS [EPS] 5 When the repair work is completed return the ignition switch to the 〃LOCK〃 position before connecting the battery cables At this time the steering lock mechanism will engage A 6 Perform a self-diagnosis check of all control units using CONSULT-III Service Notice or Precaution for EPS System INFOID0000000004307286 B CAUTION Check or confirm the following item when performing the trouble diagnosis Check any possible causes by interviewing the symptom and its condition from the customer if any C malfunction such as EPS warning lamp turns ON occurs Check if air pressure and size of tires are proper the specified part is used for the steering wheel and control unit is genuine part D Check if the connection of steering column assembly and steering gear assembly is proper there is not looseness of mounting bolts damage of rods boots or sealants and leakage of grease etc Check if the wheel alignment is adjusted properly Check if there is any damage or modification to suspension or body resulting in increased weight or E altered ground clearance Check if installation conditions of each link and suspension are proper Check if the battery voltage is proper F Check connection conditions of each connector are proper Before connecting or disconnecting the EPS control unit har- ness connector turn ignition switch OFF and disconnect battery ground cable Because battery voltage is applied to STC EPS control unit even if ignition switch is turned OFF H I SEF289H J When connecting or disconnecting pin connectors into or from EPS control unit take care not to damage pin terminals bend or break When connecting pin connectors make sure that there are no K bends or breaks on EPS control unit pin terminal L M SEF291H Before replacing EPS control unit perform EPS control unit N inputoutput signal inspection and make sure whether EPS control unit functions properly or not Refer to STC-9 "EPS Control Unit InputOutput Signal Reference Value" O P SDIA1848E STC-3 EPS SYSTEM [EPS] EPS SYSTEM System Description INFOID0000000004307287 EPS CONTROL UNIT EPS control unit performs an arithmetical operation on data such as steering wheel turning force sensor signal from the torque sensor vehicle speed signal etc Then it generates an optimum assist torque to the EPS motor according to the driving condition EPS control unit decreases the output to EPS motor while extremely using the power steering function eg full steering for protecting EPS motor and EPS control unit Protect overload sta- tus While activating protect overload status the assist torque gradually decreases and the steering wheel turning force becomes heavy The normal assist torque reactivates by not steer- ing SGIA1647E In case of an error in the electrical system the fail-safe function stops output signals to the EPS motor Then the previous state is changed to the manual steering state Self-diagnosis can be done with CONSULT-III EPS MOTOR EPS motor provides the assist torque by control signal from EPS control unit TORQUE SENSOR Torque sensor detects the steering torque and transmit the signal to EPS control unit SGIA1648E REDUCTION GEAR Reduction gear increases the assist torque provided from EPS motor with worm gears and outputs to the col- umn shaft EPS WARNING LAMP Turns ON when there is a malfunction in EPS system It indicates that fail-safe mode is engaged and enters a manual steering state Control turning force steering wheel becomes heavy Also turns ON when ignition switch is turned ON for purpose of lamp check Turns OFF after the engine starts if system is normal EPS Warning Lamp Indication Condition EPS warning lamp Turns ON when ignition switch is turned ON Lamp check Turns OFF after engine start EPS system malfunction ON Other than above system normal OFF STC-4 EPS SYSTEM [EPS] Schematic INFOID0000000004307288 A B C D E WGIA0187E F COMPONENTS FUNCTION DESCRIPTION STC Component parts Function Outputs optimum assist torque signal to EPS motor Reduces output signals to EPS motor and protects EPS motor and EPS control unit when us- H EPS control unit ing power steering continuously and excessively Electric power steering control unit As a fail-safe function turned off output signal to EPS motor and then enters a manual steer- ing state if malfunction is detected in EPS system I EPS motor Products assist torque by control signal from EPS control unit Torque sensor Detects steering wheel turning force and outputs sensor signal to EPS control unit Reduction gear Increases motor-produced assist torque by worm gear and transmits it to column shaft J EPS warning lamp Illuminates if malfunction is detected in electrical system of EPS system Transmits the following signals via CAN communication to EPS control unit ECM Engine status signal K ABS actuator and electric unit con- Transmits the following signals via CAN communication to EPS control unit trol unit With ABS Vehicle speed signal L Transmits the following signals via CAN communication to EPS control unit Combination meter Vehicle speed signal Transmits the following signals via CAN communication to EPS control unit TCM Without ABS Vehicle speed signal M CAN Communication INFOID0000000004307289 N SYSTEM DESCRIPTION CAN Controller Area Network is a serial communication line for real time application It is an on-vehicle mul- tiplex communication line with high data communication speed and excellent error detection ability Many elec- O tronic control units are equipped onto a vehicle and each control unit shares information and links with other control units during operation not independent In CAN communication control units are connected with 2 communication lines CAN-H line CAN-L line allowing a high rate of information transmission with less wiring Each control unit transmitsreceives data but selectively reads required data only P For details refer to LAN-26 "CAN System Specification Chart" STC-5 TROUBLE DIAGNOSIS [EPS] TROUBLE DIAGNOSIS Fail-Safe Function INFOID0000000004307290 If any malfunction occurs in the system and control unit detects the malfunction EPS warning lamp on com- bination meter turns ON to indicate system malfunction When EPS warning lamp is ON enters a manual steering state Control turning force steering wheel becomes heavy How to Perform Trouble Diagnosis INFOID0000000004307291 BASIC CONCEPT To perform trouble diagnosis it is a must to have an understanding about vehicle systems control and mechanism thoroughly It is also important to clarify customer complaints before starting the inspection First of all reproduce the symptoms and understand them fully Ask customer about hisher complaints carefully In some cases it will be necessary to check symptoms by driving vehicle with cus- tomer CAUTION Customers are not professionals It is dangerous to make an easy guess like maybe the customer means that or maybe the customer mentions this symptom SEF233G It is essential to check symptoms right from the beginning in order to repair malfunctions completely For intermittent malfunctions reproduce symptoms based on inter- view with customer and past examples Do not perform inspection on ad hoc basis Most intermittent malfunctions are caused by poor contacts In this case it will be effective to shake suspected harness or connector by hand When repairing without any symp- tom diagnosis you cannot judge if malfunctions has actually been eliminated SEF234G PRECAUTIONS FOR TROUBLE DIAGNOSIS Be sure to check the procedures of the trouble diagnosis in advance Refer to "How to Perform Trouble Diagnosis" Always erase memory after completing trouble diagnosis Refer to STC-11 "CONSULT-III Function EPS " Checking continuity and voltage between units be sure to check connector terminals for disconnection looseness bend or collapse Repair or replace applicable part if any non-standard condition is detected Be careful not to forcibly extend any connector terminal if a circuit tester is used for the check Always confirm the general precautions Refer to GI-3 "General Precaution" INTERVIEW Complaints vary depending on the person It is important to clarify the customers actual remarks Ask the customer about what symptoms occur under what condi- tions Use the information to reproduce the symptom of confirm by vehicle SEF907L STC-6 TROUBLE DIAGNOSIS [EPS] Component Parts Location INFOID0000000004307292 A B C D E F STC H I J K L M SGIA1623E N O P STC-7 TROUBLE DIAGNOSIS [EPS] Wiring Diagram - EPS - INFOID0000000004307293 BGWA0001E STC-8 TROUBLE DIAGNOSIS [EPS] A B C D E F STC H I J K L M N O AAGWA0003GB P EPS Control Unit InputOutput Signal Reference Value INFOID0000000004307294 SPECIFICATIONS WITH CONSULT-III CAUTION The output signal indicates the EPS control unit calculation date The normal values will be displayed even in the event that the output circuit harness is open STC-9 TROUBLE DIAGNOSIS [EPS] Monitor item Unit Content Condition Display value Power supply voltage for MOTOR VOL V Ignition switch ON Battery voltage EPS control unit Steering wheel Not steering There is no 000 Nm Steering wheel turning steering force TORQUE SENSOR Nm Engine running force 1 0 – 819 Nm The value Steering wheel Steer- is changed according to ing steering left or right Steering wheel Not steering There is no 000 A Command current to EPS steering force MOTOR SIG A Engine running motor 0 – 6500 A The value is Steering wheel Steer- changed according to ing steering left or right Steering wheel Not steering There is no 000 A Consumption current of steering force MOTOR CURRENT A Engine running EPS motor 2 0 – 6500 A The value Steering wheel Steer- is changed according to ing steering left or right Vehicle stopped 0 kmh 0 mph VEHICLE SPEED kmh or mph Vehicle speed Approximately equal to While driving the indication on speed- ometer Inside of ?10 3 EPS warning lamp condi- EPS warning lamp ON ON WARNING LAMP ONOFF tion EPS warning lamp OFF OFF Steering wheel Nor- OFF mal steering DERATING STAT ONOFF Protect overload status Engine running Steering wheel Steer- 4 ON ing over the stop Engine stopped STOP Engine speed Less than 400 rpm ENGINE STATUS RUNSTOP Engine status Engine running RUN Engine speed 400 rpm or more 1 In the front of the value L is displayed at steering left and R is displayed at steering right 2 Almost in accordance with the value of MOTOR SIG It is not a malfunction though these values are not accorded when steering quickly 3 It is not a malfunction though it might not be corresponding just after ignition switch is turned ON 4 It turns to OFF after waiting for a short period of time EPS Terminal and Reference Value INFOID0000000004307295 EPS HARNESS CONNECTOR TERMINAL LAYOUT SGIA1624E TERMINALS AND REFERENCE VALUES FOR EPS CONTROL UNIT STC-10 TROUBLE DIAGNOSIS [EPS] Data are reference values and are measured between each terminal and ground Wire A Terminal Item Condition Data Approx color Steering wheel Not steering 25 V There in no steering force B 4 V Torque sensor sub Engine running 17 V – 33 V Steering wheel Steering The value is changed accord- ing to steering left or right C Ignition switch ON 8 V 5 BR Torque sensor power supply Ignition switch OFF 0 V Steering wheel Not steering D 25 V There is no steering force 6 G Torque sensor main Engine running 17 V – 33 V Steering wheel Steering The value is changed accord- E ing to steering left or right 7 R Torque sensor ground Always 0 V 9 L CAN-H F Ignition switch ON Battery voltage 10 O Power supply Ignition switch OFF 0 V STC 16 P CAN-L Ignition switch ON Battery voltage 17 R Power supply Memory back-up Ignition switch OFF Battery voltage H 18 B Ground Always 0 V 19 Motor 20 Motor –