03 LEXUS LX470 Engine.ppt

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,