【汽车技术】雷克萨斯LX470维修技术培训—LEXUS技术资料(188PPT).ppt

This CD-ROM presentation is addressed to sales and service personnel and contains basic technical information about the features of the LEXUS LX470. This CD-ROM is STRICTLY for IN-DISTRIBUTOR and DEALER USE.,The letters displayed in the upper right-hand corner represent destination codes of models which include the features described in that particular slide. Please include in your presentation all of the relevant slides or explanations whose destination codes correspond to those in your market.,This CD-ROM presentation contains photos for the prototype version of the vehicle. As such, some of the photos shown here may vary from the model in your market.,LX470,LX470,Contents,Model Outline Engine Chassis Body Body Electrical,Model Outline,Line-up Line-off August, 2002 Model Line-up,Model Outline,Model Code,UZJ100 L G N A G K A,1,2,3,4,5,6,7,8,Model Outline,Equipment LEXUS Night View System This system may assist the driver for front field of view at night This is optional equipment for U.S.A.,Night View Display,Drivers View,Model Outline,Mechanism Cranking Hold Function Once the ignition switch is turned to the START position, this control continues to operate starter until engine starts,Starter,Ignition Switch,Engine starts,“Start”,Operate,Operates Automatically,“ON”,Stop,Model Outline,Mechanism A750F Automatic Transmission A750F 5-speed automatic transmission (Super ECT ) is newly added,Model Outline,Mechanism VGRS (Variable Gear Ratio Steering) System The steering gear ratio will be changed in accordance with the vehicle speed,Low Ratio (Quick),High Ratio (Slow),Vehicle speed low,Vehicle speed high,a,a,a + ,Model Outline,Passive Safety SRS Airbag System Roll sensing of curtain shield airbags control (RSCA) is adopted,Both sides curtain sealed airbags,Both sides front seat belt pretensioners,RSCA Control,Engine,Cooling System Intake & Exhaust System Fuel System Charging System Engine Control System,Engine,Radiator Core,03 LX470,02 LX470,3.0 mm (0.12 in.),3.5 mm (0.14 in.),Cooling System Radiator Core The fin pitch of the radiator core is reduced to improve cooling performance,Engine,Intake & Exhaust System TWC Tandem type TWCs are used to comply the SFTP regulation,Tandem type TWCs,Reference,Intake & Exhaust System TWC Specification,Engine,Fuel System Charcoal Canister The capacity of charcoal canister is increased to reduce evaporative emission,*: Saudi Arabia,Engine,Charging System Alternator Compact and lightweight Segment Conductor type alternator is used,Segment Conductor,Twisted,Joined Segment Conductor System,Joined,A Cross Section Diagram,A,Stator,Engine,Engine Control System Oxygen Sensor ETCS-i Fuel Pump Control Evaporative Emission Control System Cranking Hold Function Engine Control Module Diagnosis System,Engine,Engine Control System Oxygen Sensor Ultra-high temperature resistant oxygen sensor is used to comply with the SFTP regulations,Element,Element Covers,Bushing,Heater Brazing,: Ultra-high temperature resistant materials,Engine,Engine Control System ETCS-i The accelerator cable and magnetic clutch is discontinued,Accelerator Pedal Position Sensor,Throttle Position Sensor,Throttle Control Motor,Accelerator Cable,02 LX470,Accelerator Pedal Position Sensor,Throttle Position Sensor,Throttle Control Motor,03 LX470,Magnetic Clutch,Engine ECU (ECM),Engine ECU (ECM),Throttle Position Sensor,Engine,Engine Control System ETCS-i A No-contact type throttle position sensor is used,Throttle Control Motor,Reduction Gears,Throttle Valve,Hall ICs,Magnets,Reference,Engine Control System ETCS-i Two Hall ICs and two magnets are used for throttle position sensor,Throttle Valve,Hall ICs,Magnets,Engine,Engine Control System ETCS-i Throttle position sensor converts into electric signals the magnetic flux density,Throttle Valve Opening Angle,Full Open,Full Close,VTA,VTA2,Output Voltage (V),0,5,Engine ECU (ECM),VTA,VTA2,E2,VC,Hall IC,Magnet,Service Point,Engine Control System ETCS-i Parts inspection of the throttle position sensor is discontinued,02 LX470 (Contact type),03 LX470 (No-contact type),Throttle Control Motor M+ M- : 0.3 100 at 20C (68 F) Magnetic Clutch CL+ CL- : 4.2 5.2 at 20C (68 F) Throttle Position Sensor VC E2 : 1.25 2.35 k at 20C (68 F),Inspection,Throttle Control Motor M+ M- : 0.3 100 at 20C (68 F),Inspection, The magnetic clutch is discontinued The throttle position sensor can not be inspected,Engine,Engine Control System ETCS-i The accelerator pedal position sensor is mounted on the accelerator pedal,Accelerator Pedal Position Sensor (Contact Type),VPA1,VPA2,Engine,Engine Control System Fuel Pump Control Fuel pump speed is controlled as 2-step by using fuel pump resistor,Engine ECU (ECM),FC,+B,FPR,Fuel Pump Resistor,Fuel Pump Relay,Circuit Opening Relay,Fuel Pump Motor,Hi,Low,Reference,Engine Control System Fuel Pump Control Location of fuel pump resistor,Fuel Pump Resistor,Engine,Engine Control System Evaporative Emission Control System The vacuum type leakage detection function is used to comply with the OBD-II regulations,Leaks from a hole of ø 0.5 mm or more can be detected,Canister Close Valve,Vapor Pressure Sensor,Charcoal Canister,To Intake Manifold,From Air Connector Pipe,Purge Valve,ORVR Valve,Pressure Switching Valve,Engine,Engine Control System Cranking Hold Function Once the ignition switch is turned to the START position, this control continues to operate starter until engine starts,Starter,Ignition Switch,Engine starts,“Start”,Operate,Operates Automatically,“ON”,Stop,Engine,Engine Control System Cranking Hold Function System Diagram,ST,ACC,NE,THW,Park/Neutral Position Switch,Audio & Illumination,Starter Relay,Starter,Engine Coolant Temp. Sensor,Crankshaft Position Sensor,ACC Cut Relay,Ignition Switch,Engine ECU (ECM),ST,ACC,NE,THW,Park/Neutral Position Switch,Audio & Illumination,Starter Relay,Starter,Engine Coolant Temp. Sensor,Crankshaft Position Sensor,ACC Cut Relay,Ignition Switch,Engine ECU (ECM),Engine,Engine Control System Cranking Hold Function The ACC cut relay cuts off the ACC circuit while engine is cranking to prevent the accessory illumination from operating intermittently,Engine,Engine Control System Cranking Hold Function (Operation),Ignition Switch,Starter Relay,ACC Cut Relay,NE Signal,Time,Start,Automatically Controlled,Judgment,0.2 sec. or more,ON,Reference,Engine Control System Cranking Hold Function Judgment of the engine starting,Engine Coolant Temp. (C),Judgment Level (rpm),500,900,0,Reference Value!,Confidential,Engine,Engine Control System Cranking Hold Function The maximum cranking time will be changed with engine coolant temp.,Reference Value!,Engine Coolant Temp. (C),Max. Cranking Time (sec.),When engine coolant temp. is lower, the time limit is longer,5,0,Confidential,Engine,Engine Control System Cranking Hold Function If the engine is already running, the engine ECU (ECM) will not energize to the starter relay,Start,Ignition Switch,ON,OFF,Engine is already running,700 rpm,Starter Relay,NE Signal,Engine,Engine Control System Cranking Hold Function If the engine speed becomes 1200 rpm or more while cranking, the engine ECU (ECM) turns off a starter relay to prevent starter overrun,Time,1200 rpm,Driver operates intentionally,OFF,Starter Relay,NE Signal,Start,Ignition Switch,ON,Engine,Engine Control System Cranking Hold Function When a starter is intentionally operated by driver, the engine ECU (ECM) turns off a starter relay after 30 sec. in order to prevent starter overheating,Starter Relay,NE Signal,30 sec.,Driver operates intentionally,OFF,Engine does not start (Problem),Start,Ignition Switch,ON,Time,Engine,Engine Control System Engine Control Module 32-bit CPU of the engine ECU has been changed from the 16-bit CPU to increase the speed for processing the signals,Engine,Engine Control System Diagnosis System To comply with the OBD-II regulations, all the DTC have been made to correspond to SAE controlled codes. Some of the DTC have been further divided into smaller detection area than in the past, and new DTC have been assigned to them.,Example,Old DTC,New DTC,Chassis,Automatic Transmission Brake Control System Steering VGRS (Variable Gear Ratio Steering) System Tire and Wheel,Chassis,Automatic Transmission A750F Automatic Transmission A750F 5-speed automatic transmission (Super ECT ) is newly added,Chassis,Automatic Transmission A750F Automatic Transmission Fuel economy and dynamic performance have been improved,: 2.804,Wide Gear Ratio,A343F,A750F,Total Gear Ratio (Differential Included),Acceleration Performance,Fuel Economy,: 3.520,: 0.716,: 0.754,(14),(3),Chassis,Automatic Transmission Specification,Chassis,Automatic Transmission A750F Automatic Transmission Gate type shift lever is newly used,Shift Indicator Light,Chassis,Automatic Transmission Oil Pump The crescent has been discontinued. As a result oil pump has made more compact and the driving torque has been reduced,Drive Gear,Driven Gear,Pump Body: Made of aluminum to reduce the weight,Stator Shaft Assembly,Crescent discontinued,Chassis,Automatic Transmission Planetary Gear Unit The 5-speed configuration has been achieved without increasing the number of planetary gear,: Brake,: Clutch,: One-way Clutch,A750,A650,Input,Input,Output,Output,3 Planetary Gears,Chassis,Automatic Transmission Various Control A750F are performing the following controls,Centrifugal Fluid Pressure canceling,Line Pressure Optimal Control,Clutch Pressure Control,Flex Lock-up Clutch Control,AI (Artificial Intelligence) -shift Control,Chassis,Brake System Specification Front caliper type has been changed for A and W models,Chassis,Brake Control System ABS with EBD, Brake Assist, A-TRAC & VSC System The deceleration sensor and solenoid valves are changed,Switching and Control Solenoid Valves,Combination Meter,Warning Light Signal,Hydraulic Brake Booster,Various Sensors,Chassis,Brake Control System Yaw Rate and Deceleration Sensor Deceleration sensor has been integrated in the yaw rate sensor,Deceleration Sensor (G Sensor),Yaw Rate Sensor,Chassis,Brake Control System Switching and Control Solenoid Valves The resistance value of the coil of the solenoid valve was changed for continuation operation time extension of the system,NOTE When the voltage is 13 V: New Model: 7.2 x 7.2 x 1.81 A = 23.58 W Previous Model: 5 x 5 x 2.60 A = 33.8 W,Chassis,Steering Overall Internal-external tube bushings and low friction rack guide have been adopted to facilitate a natural steering feeling,Internal-external Tube Bushing,Low-friction Rack Guide,Chassis,Steering Reverse Variable Gear Ratio Type Rack Bar Gear ratio near the end position of the rack bar is shorter than near the neutral steering position,Neutral Position,End Position,Hollow Type Steering Rack Bar,Steering Stroke Ratio,Chassis,Steering Specification,*: The gear ratio and the number of lock-to-lock turns are made variable for the VGRS system,Chassis,VGRS (Variable Gear Ratio Steering) System General The steering gear ratio will be changed in accordance with the vehicle speed,Low Ratio (Quick),High Ratio (Slow),Vehicle speed low,Vehicle speed high,a,a,a + ,Chassis,VGRS System System Diagram (Main Signal),VGRS ECU,VGRS Actuator,Skid Control ECU,VGRS Warning Light,Suspension Control ECU,Steering Angle Sensor,DLC3,Steering Angle,Steering Wheel Neutral Position Vehicle Speed Engine Speed Etc.,VGRS Actuator Operating Angle,Engine Speed,Wheel Angle (Steering Angle + VGRS Actuator Operating Angle),Control Signal,Temp. Sensor,Rotational Angle Sensor,Lock Mechanism,Engine ECU (ECM),VGRS Actuator Actual Operating Angle,Chassis,VGRS System Location,VGRS ECU,VGRS Actuator,Steering Angle Sensor,VGRS Warning Light,Combination Meter,Chassis,VGRS System Steering Gear Ratio,Vehicle Speed,Steering Gear Ratio,: 02 Model,Comparison of the gear ratio,Gear Ratio : 12.4 Lock to Lock : 2.4,Gear Ratio : 18.0 Lock to Lock : 3.5,Slow,Gear Ratio : 17.3 Lock to Lock : 3.3,Quick,Gear Ratio : 19.8 Lock to Lock : 3.8,VGRS system not operates,Chassis,VGRS System Normal Operation,VGRS Actuator,VGRS ECU,Steering Angle Sensor,Vehicle Speed,Skid Control ECU,Steering Angle,Vehicle Speed,Actuator Operating Angle,Map,Calculate actuator target operating angle,Control Signal (Target Operating Angle),Motor,Gear,Reference,VGRS System Control The VGRS ECU adds the supplemental assist with steering speed to reduce delay of vehicle response,VGRS + Assist,Actuator Output,Normal Operation,Slippery Surface,Chassis,VGRS System Cooperative Control of Brake Control System For example, in order to enable quicker steering when braking suddenly (VSC active),Drives steering effort,Braking,Effectiveness of Cooperative Control of Brake Control System,Reference,VGRS System Cooperative Control of Brake Control System This control operates by signal from skid control ECU,VGRS ECU,VGRS Actuator,Skid Control ECU,Request the cooperative control,Most low gear ratio assist,Chassis,VGRS System VGRS Actuator,Reduction Mechanism,Lock Mechanism,DC Motor,Spiral Cable,VGRS Actuator,Steering Wheel,Rack & Pinion,Rubber Coupling,Service Point,VGRS System VGRS Actuator Exchange VGRS actuator assembly (overhaul is impossible),Remove Assembly,New VGRS Actuator,Install Assembly,Broken VGRS Actuator,VGRS Actuator,Parts Number: 45220-60180,Chassis,VGRS System Spiral Cable Flexible flat cable is used,VGRS ECU,Power Source,Control Signal,Rotational angle and rotational direction of the DC motor,Motor,Service Point,VGRS System Spiral Cable Secure the neutral position of this cable before installing VGRS actuator (same as spiral cable for drivers airbag),Turn the cable clockwise until it becomes harder to turn Then turn the cable counterclockwise about 2.5 turns,2.5 rev.,Reference,VGRS System Spiral Cable System diagram (VGRS ECU VGRS actuator),VGRS Actuator,Lock Solenoid,MV,MSU,VGRS ECU,MSV,MSW,MG,BMU,BMV,BMW,LG,DC Brushless Motor,Spiral Cable,Hall ICs,Chassis,VGRS System Lock Mechanism This mechanism locks the motor shaft, so that if the system will be failure,Motor Shaft,A,A,A A Cross Section,Lock Holder (Motor Shaft),Solenoid,Lock Lever (Housing),Return Spring,Chassis,VGRS System Lock Mechanism,Lock,Unlock,Chassis,VGRS System Motor A compact high-output low-noise DC brush-less motor is controlled by duty signal,Magnet,Coil,Motor Shaft,Rotational Angle sensor (Three Hole ICs) is included in the motor,DC Motor,Reduction Mechanism,Driven Gear,Stator Gear,Flexible Gear,Wave Generator,Chassis,VGRS System Reduction Mechanis