INTAKE AIR CONTROL VALVE
Note. Intake Air Control (IAC) valve is used on Acoustic Control Induction System (ACIS).
INTAKE AIR CONTROL VALVE VACUUM SWITCHING VALVE
Note. Intake air control valve VSV may also be referred to as Acoustic Control Induction System (ACIS) vacuum switching valve.
ENGINE CONTROL MODULE (ECM)
| CAUTION | If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - LEXUS article in GENERAL INFORMATION. |
Ensure ignition is off. Remove ECM. See ECM LOCATION table. To install, reverse removal procedure.
| Application | Location |
|---|---|
| ES300, LX470 & RX300 | Behind Glove Box |
| GS300, IS300, GS430, LS430 & SC430 | Left Front Of Engine Compartment |
ECM LOCATION
AIR/FUEL RATIO (A/F) SENSOR
Note. Air/Fuel Ratio (A/F) sensor may also be referred to as Air/Fuel (A/F) sensor.
HEATED OXYGEN SENSOR
Note. Bank 1 refers to bank that includes cylinder No. 1. Bank 2 refers to bank without cylinder No. 1. Sensor 1 refers to sensor closest to engine block. Sensor 2 refers to sensor farthest away from engine block.
PARK/NEUTRAL POSITION (PNP) SWITCH
Note. ES300 and IS300 use a shift interlock system on automatic transmission. See appropriate SHIFT INTERLOCK SYSTEMS article.
CAMSHAFT POSITION (CMP) SENSOR
Note. On ES300 and RX300, Camshaft Position (CMP) sensor is also known as Variable Valve Timing (VVT) sensor. For VVT sensor removal and installation, see VARIABLE VALVE TIMING (VVT) SENSOR under VARIABLE VALVE TIMING (VVT) SYSTEM.
FUEL SYSTEM
| WARNING | Always relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. See FUEL SYSTEM PRESSURE RELEASE . |
FUEL FILTER (IN-TANK)
Note. LX470 is not equipped with an in-tank fuel filter. Fuel filter is located on fuel pump. See REMOVAL (LX470) under FUEL PUMP.
GS300, GS430, IS300, LX470 & SC430
- Ensure fuel line connector is clean. Disconnect fuel line quick connector as illustrated. (Scheme 78) If connector and line are stuck, pinch retainer, push and pull connector to free. DO NOT use tools to disconnect connector. After disconnecting, ensure seal surface is clean. Cover connector with plastic to prevent damage.
- When removing retainer from fuel line, replace with new one. Apply small amount of engine oil to fuel line tip for easier installation. Push connector and retainer together until a click sound is heard. Ensure connection is secure by pulling on connector. Start engine and check for leaks.
Scheme 78
FUEL PRESSURE PULSATION DAMPER
Note. For ES300, See Removal (ES300) under FUEL RAILS & INJECTORS. For RX300, see FUEL PRESSURE REGULATOR .
FUEL PRESSURE REGULATOR
Note. All models except LX470 use a returnless fuel system. Fuel pressure regulator is mounted to fuel pump assembly and is located in fuel tank. LX470 uses a fuel return system with fuel pressure regulator mounted on fuel rail.
FUEL PUMP SWITCH
Note. Fuel pump switch may also be referred to as fuel pump inertia switch or fuel pump control switch.
RX300
If IAC valve replacement is necessary, remove throttle body. See THROTTLE BODY .
CHARCOAL CANISTER
Note. Charcoal canister is also referred to as EVAP canister.
VARIABLE VALVE TIMING (VVT) INTAKE CAMSHAFT PULLEY
For removal and installation procedure of variable valve timing intake camshaft pulley, see appropriate article in ENGINES.
VARIABLE VALVE TIMING (VVT) SENSOR
Note. GS300 and IS300 models are equipped with variable valve timing but use the camshaft position sensor instead of Variable Valve Timing (VVT) sensors to determine camshaft position. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEM.
ES300 & RX300
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Air/Fuel Ratio Sensor | 32 (43) | |
| Air Intake Chamber Bolts | 32 (43) | |
| Engine Coolant Temperature Sensor | 14 (19) | |
| Fuel Line-To-Intake Manifold Bolt | 14 (19) | |
| Heated Oxygen Sensor | 32 (43) | |
| IAC Valve No. 1 Bolts & Nut (ES300) | 15 (21) | |
| Intake Manifold Bolts/Nuts | (1) 11 (15) | |
| Intake Air Control Valve Nuts (RX300) | 10 (14) | |
| Knock Sensor | 29 (39) | |
| No. 1 Engine Hanger Bolt | 29 (39) | |
| Shift Cable-To-Control Lever Nut | 11 (15) | |
| Spark Plug | 13 (18) | |
| Throttle Body Bracket Bolt | 14 (19) | |
| Vapor Canister | 29 (39) | |
| Windshield Wiper Arm Nut (RX300) | 18 (24) | |
| INCH Lbs. (N.m) | ||
| Crankshaft Position Sensor Bolt | 71 (8.0) | |
| Fuel Filter (In Tank) | 18 (2.0) | |
| Fuel Pressure Regulator Screw (In Tank) | 18 (2.0) | |
| Fuel Pump Protector (ES300) | 35 (3.9) | |
| Fuel Pump-To-Tank Bolts | 35 (3.9) | |
| Fuel Rail Mounting Bolts | 89 (10.0) | |
| Ignition Coil/Ignitor Bolt | 71 (8.0) | |
| IAC Valve No. 2 Bolts & Nut (ES300) | 89 (10) | |
| Park/Neutral Position Switch Bolt | 48 (5.4) | |
| Throttle Body Screws | ||
| ES300 | 97 (11) | |
| RX300 | 61 (6.9) | |
| Variable Valve Timing Sensor (2) | 71 (8.0) | |
| (1) see scheme 21(2) Variable valve timing sensor is also known as camshaft position sensor. | ||
| (1) | See scheme 21 |
| (2) | Variable valve timing sensor is also known as camshaft position sensor. |
TORQUE SPECIFICATIONS (ES300 & RX300)
GS300, GS430, IS300, LS430, LX470 & SC430
| Application | Ft. Lbs. (N.m) | |
|---|---|---|
| Air Intake Chamber Bolts/Nuts | ||
| GS300 & IS300 | 21 (28) | |
| Delivery Pipes To Lower Intake Manifold | 15 (21) | |
| Engine Coolant Temperature Sensor | 14 (19) | |
| Exhaust Pipe Bolts (SC430) | 33 (44) | |
| Front Floor Brace Center (SC430) | 15 (20) | |
| Fuel Pressure Pulsation Damper | 29 (39) | |
| Fuel Rail Mounting Bolts | ||
| GS300 & IS300 | 15 (20) | |
| Fuel Rail Mounting Nuts | ||
| GS430, LS430, LX470 & SC430 | 13 (18) | |
| Fuel Tank Strap Bolts | 29 (39) | |
| Generator Mounting Bolt/Nut | ||
| GS300 & IS300 | 30 (40) | |
| Heated Oxygen Sensor | ||
| Except LX470 | 33 (44) | |
| LX470 | 32 (44) | |
| Heated Oxygen Sensor Bolts (LX470) | 15 (20) | |
| Intake Manifold Bolts/Nuts | ||
| GS300 & IS300 | (1) 21 (28) | |
| Knock Sensor | 33 (45) | |
| Lower Intake Manifold Bolts | ||
| GS430, LS430, LX470 & SC430 | (1) 13 (18) | |
| Power Steering Pump Rear Stay (GS300 & IS300) | 29 (39) | |
| Spark Plugs | 13 (18) | |
| Starter Bolts | ||
| GS300 & IS300 | 27 (37) | |
| Suspension Member Brace Bolts (SC430) | 17 (23) | |
| Throttle Body Nuts/Bolts | ||
| GS300 & IS300 | 15 (20) | |
| GS430, LS430, LX470 & SC430 | 13 (18) | |
| Transmission Control Shaft Lever Nut | 12 (16) | |
| Upper-To-Lower Intake Manifold Bolts/Nuts | ||
| GS430, LS430 & SC430 | (1) 13 (18) | |
| Vehicle Speed Sensor Bolt (LX470) | 12 (16) | |
| INCH Lbs. (N.m) | ||
| Accelerator Pedal Position Sensor Screws (2) | ||
| GS300 & IS300 | 33 (3.7) | |
| LX470 | 44 (5) | |
| Camshaft Position Sensor Bolt | ||
| GS300 & IS300 | 80 (9.0) | |
| GS430, LS430, LX470 & SC430 | 66 (7.5) | |
| Camshaft Timing Oil Control Valve Bolt | ||
| GS300 & IS300 | 71 (8.0) | |
| GS430 & LS430 | 66 (7.5) | |
| SC430 | 75 (8.5) | |
| Crankshaft Position Sensor Bolt | ||
| GS300 & IS300 | 80 (9.0) | |
| GS430, LS430, LX470 & SC430 | 58 (6.5) | |
| Front Floor Heat Insulator Bolts (SC430) | 48 (5.4) | |
| Fuel Pressure Regulator Bolts (LX470) | 66 (7.5) | |
| Fuel Tank Vent Tube Set Plate Bolts | 31 (3.5) | |
| Ignition Coil Bolt | ||
| GS300 & IS300 | 71 (8.0) | |
| GS430, LS430, LX470 & SC430 | 66 (7.5) | |
| Intake Air Control Valve Bolt | ||
| GS430 & LS430 | 75 (8.5) | |
| Park/Neutral Position Switch | ||
| Bolt | (3) 115 (13) | |
| Nut | 115 (13) | |
| Shift Lever Nut | 115 (13) | |
| Throttle Control Motor Cover Screws (4) | ||
| GS300 & IS300 | 15 (1.7) | |
| Throttle Control Motor Screws (4) | ||
| GS300 & IS300 | 33 (3.7) | |
| Throttle Position Sensor Screws | ||
| GS300 | 15 (1.7) | |
| GS430, LS430 & SC430 | 18 (2.0) | |
| Upper Timing Belt Cover Bolts (2) | ||
| GS300 & IS300 | 71 (8.0) | |
| LX470 | 66 (7.5) | |
| Variable Valve Timing Sensor | ||
| GS430 & LS430 | 58 (6.5) | |
| Vehicle Speed Sensor Bolt (Except LX470) | 48 (5.4) | |
| (1) Uniformly tighten in several passes. (2) On GS430, LS430 and SC430, information is not available from manufacturer. (3) On IS300, tighten park/neutral position switch bolt to 48 INCH lbs. (5.4 N.m). (4) On GS430, LS430, LX470 and SC430, Throttle Motor and Throttle Body are replaced as a unit. | ||
| (1) | Uniformly tighten in several passes. |
| (2) | On GS430, LS430 and SC430, information is not available from manufacturer. |
| (3) | On IS300, tighten park/neutral position switch bolt to 48 INCH lbs. (5.4 N.m). |
| (4) | On GS430, LS430, LX470 and SC430, Throttle Motor and Throttle Body are replaced as a unit. |
TORQUE SPECIFICATIONS (GS300, GS430, IS300, LS430, LX470 & SC430)