Engine Cooling System Intake & Exhaust System Fuel System Charging System Engine Control System

Engine Radiator Core ’03 LX470 ’02 LX 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 -A

Engine Intake & Exhaust System TWC –Tandem type TWCs are used to comply the SFTP regulation Tandem type TWCs -A-W-Q-V

Reference Intake & Exhaust System TWC –Specification Cell Density: 62 cells / cm 2 Wall Thickness : 0.09 mm Volume : 875 cm 3 Material : Ceramic Cell Density: 62 cells / cm 2 Wall Thickness : mm Volume : 1083 cm 3 Material : Ceramic Noble Platinum Portion -A-W-Q-V

Engine Fuel System Charcoal Canister –The capacity of charcoal canister is increased to reduce evaporative emission ’03 LX470’02 LX470 Capacity -A 3.0 liters (3.17 US qts, 2.64 Imp. qts) 2.4 liters (2.54 US qts, 2.11 Imp. qts) -W2.4 liters (2.73 Imp. qts)- -Q2.4 liters (2.73 Imp. qts)1.4 liters (1.59 Imp. qts) -V 1.4 liters (1.59 Imp. qts) 2.4 liters (2.73 Imp. qts)* 1.4 liters (1.59 Imp. qts) -A-W-Q-V *: 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 -A

Engine Engine Control System Oxygen Sensor ETCS-i Fuel Pump Control Evaporative Emission Control System Cranking Hold Function Engine Control Module Diagnosis System -A-W-Q-V

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 -A-W-Q-V

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) -A-W-Q-V

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 -A-W-Q-V

Reference Engine Control System ETCS-i –Two Hall ICs and two magnets are used for throttle position sensor Throttle Valve Hall ICs Magnets -A-W-Q-V

Engine Engine Control System ETCS-i –Throttle position sensor converts into electric signals the magnetic flux density Throttle Valve Opening Angle Full OpenFull Close VTA VTA2 Output Voltage (V) 0 5 Engine ECU (ECM) VTA VTA2 E2 VC Hall IC Magnet -A-W-Q-V

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 20C (68 F) Magnetic Clutch CL+  CL- : 4.2 – 5.2  at 20C (68 F) Throttle Position Sensor VC  E2 : 1.25 – 2.35 k at 20C (68 F) Inspection Throttle Control Motor M+  M- : 0.3 – 100  at 20C (68 F) Inspection  The magnetic clutch is discontinued  The throttle position sensor can not be inspected -A-W-Q-V

Engine Engine Control System ETCS-i –The accelerator pedal position sensor is mounted on the accelerator pedal Accelerator Pedal Position Sensor (Contact Type) VPA1VPA2 -A-W-Q-V

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 M Fuel Pump Motor Hi Low -A-W-Q-V

Reference Engine Control System Fuel Pump Control –Location of fuel pump resistor Fuel Pump Resistor -A-W-Q-V

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 -A

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 -A-W-Q-V

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) -A-W-Q-V

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 -A-W-Q-V

Engine Engine Control System Cranking Hold Function (Operation) Ignition Switch Starter Relay ACC Cut Relay NE Signal Time Start : Without this system : With this system Automatically Controlled Judgment 0.2 sec. or more ON -A-W-Q-V

Reference Engine Control System Cranking Hold Function –Judgment of the engine starting Engine Coolant Temp. (C) Judgment Level (rpm) Engine Coolant Temp. Judgment Level Above 0 C (32 F) Approx. 500 rpm Below 0 C (32 F) Approx rpm Reference Value!! -A-W-Q-V 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 (°F)) Max. Cranking Time (sec.) 100 (212) Approx. 2 0 (32) Approx (-22) Approx. 25 Engine Coolant Temp. (C) Max. Cranking Time (sec.) When engine coolant temp. is lower, the time limit is longer 5 0 Confidential -A-W-Q-V

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 -A-W-Q-V

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 -A-W-Q-V

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 -A-W-Q-V

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 -W-Q-V

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. DTCDetection Item P0135 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1) DTCDetection Item P0031 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1) P0032 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1) Example Old DTC New DTC -A-W-Q-V