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 article in GENERAL INFORMATION. |
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 No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block. Sensor No. 2 refers to sensor farthest away from engine block.
FUEL SYSTEM
| WARNING | Always relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. |
Scheme 59
- On ES300, GS300 and GS400, remove rear seat cushion and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Go to step 5.
- On LS400, SC300 and SC400, remove trunk floor mat. Remove trunk trim cover from behind rear seat in the trunk for access to the fuel tank. Disconnect 2-pin electrical connector for fuel pump. Electrical connector for fuel pump is located near the rear speaker and fuel pump is located on front of fuel tank, behind rear seat. Go to step 5.
- On LX470, disconnect electrical connector for fuel pump. (Scheme 59) This is electrical connector for fuel pump and fuel gauge sending unit. Go to step 5.
- On RX300, remove driver's side rear seat. Remove carpet and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit, and is located on top of fuel tank, near fuel pump. Go to next step.
- On all models, start engine and allow engine to idle until engine stalls. Turn ignition off. Reinstall electrical connector for fuel pump and any removed components.
- Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen fuel line connection, allowing any fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced.
GS300, GS400 & LX470
- Ensure fuel line connector is clean. Disconnect fuel line connector as illustrated. (Scheme 60) 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 60
FUEL PUMP SWITCH
Note. Fuel pump switch may also be referred to as fuel pump inertia switch or fuel pump control switch.
ES300 & RX300
If IAC valve replacement is necessary, remove throttle body. See THROTTLE BODY .
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.
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 ENGINE article.
VARIABLE VALVE TIMING (VVT) SENSOR
Note. GS300 and SC300 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.