Engine management system Toyota Highlander 1 (XU20)

Emission Control and Engine Management System Specifications
Tightening torques for threaded connections, Nm (unless otherwise stated) Knock sensor Models with four-cylinder engine (with nut) - 20 Models with V6 engine 1999-2003. (screw-in type) — 39 Since 2004 (with nut) - 20...

General information about engine management
To prevent pollution of the atmosphere by exhaust gases containing particles of unburned fuel and fuel vapors from the tank and to maintain good overall vehicle handling and fuel economy, the vehicle is equipped with...

Information about On-Board Diagnostic System (OBD)Testers
1. Handheld testers are used to test engine management systems used on later model year vehicles. Because reading diagnostic trouble codes (DTCs) from the engine management system is only the first step in...

On-Board Diagnostic (OBD) Sensors
Note: The following is a brief description of the purpose, operation, and location of each important information sensor. The sensor names use the standard terminology recommended by the Society of Automotive Engineers...

On-Board Diagnostics (OBD) — Output Actuators
Powertrain Control Module (PCM) 19. Based on the information it receives from the sensors described above, the PCM controls the pulse width of the fuel injectors (cyclic feed), idle speed, ignition timing, primary...

Accelerator Pedal Position Sensor (APP) — Replacement
Note: On 2004 and later models, the APP sensor is located on the top edge of the accelerator pedal assembly. The APP sensor and accelerator pedal are removed as a single unit. 1. Disconnect the ground cable from the...

Camshaft Position Sensor (CMP) — Replacement
Models with four-cylinder engine Note: The CMP sensor is located on the left end of the cylinder head. 1. Disconnect the ground cable from the battery ( see paragraph 1 of chapter 5 ). 2. If necessary, remove the air...

Crankshaft Position Sensor (CPS) — Replacement
Models with four-cylinder engine Application: The CKP sensor is located on the front side of the engine - on the timing chain cover next to the crankshaft pulley/damper. 1. Disconnect the ground cable from the battery (...

Engine Coolant Temperature (ECT) Sensor — Replacement
Caution: Wait until the engine has cooled down completely before starting this procedure. Models with four-cylinder engine Caution: Handle the ECT sensor with care. Damage to the ECT sensor will adversely affect the...

Knock Sensor — Replacement
Caution: Wait until the engine has cooled down completely before starting this procedure. Models with four-cylinder engine Note: The knock sensor is located on the underside of the cylinder block and must be accessed by...

Mass Air Flow/Intake Air Temperature (MAF/IAT) Sensor — Replacement
Note: The MAF/IAT sensor is located on the top of the air cleaner housing. 1. Disconnect the ground cable from the battery ( see paragraph 1 of chapter 5 ). 2. Disconnect the MAF sensor electrical connector (Fig. 8.2)....

Oxygen sensors — replacement
General information 1. When servicing the oxygen sensor, take special precautions: Oxygen sensors have a permanently attached flexible wire and electrical connector that cannot be removed from the sensor. Damaging or...

Power Steering Pressure (PSP) Sensor — Replacement
Caution: Allow the power steering fluid to cool completely before starting this procedure. 1. Disconnect the ground cable from the battery ( see paragraph 1 of chapter 5 ). 2. Raise the front of the vehicle and place...

Throttle Position Sensor (TP) — Replacement
Note: On 1999-2003 models, the TP sensor is located on the throttle body (On 2004 and later models, this sensor is an integral part of the electronic throttle body and cannot be removed.) 1. Disconnect the ground wire...

Transmission Range (TR) Sensor — Replacement
Removal Note: The TR sensor is located on the front of the transmission. 1. Disconnect the ground cable from the battery ( see paragraph 1 of chapter 5 ). 2. Raise the vehicle and place secure supports underneath it. 3....

Gearbox Speed Sensors — Replacement
Note: The speed sensors are located on top of the transmission in the block with the drive axle. The turbine input speed sensor is located on the left end of the transmission (on the driver's side); the intermediate...

Powertrain Control Module (PCM) — Replacement
Warning! The models covered by this manual are equipped with a Supplemental Restraint System (SRS), commonly known as the air bag system. To prevent accidental air bag deployment, which could result in injury, be sure...

Variable Geometry Intake System (ACIS) — Design Description and Replacement of Elements
Description of the design Application: ACIS is only available on V6 models. It is not available on four-cylinder engines. 1. When the intake valve is closed, incoming air flowing through the intake port hits the closed...

Air Intake Control System — Design Description
Note: This system is not used in Lexus PX330 models 2004 and later. At the time of going to press, information on the availability of spare parts for this system was not available. 1. The air intake control system...

Idle Air Control Valve (IAC) — Replacement
Models with four-cylinder engine Notes: The IAC valve is located on the underside of the throttle body. 1. Disconnect the ground cable from the battery ( see paragraph 1 of chapter 5 ). 2. Remove the throttle body ( see...

Catalytic converters — design description, testing and replacement of elements
Note: Since emission control system components such as the catalytic converter are covered by warranty, contact your dealer's service department before attempting to replace the catalytic converter yourself. Note: The...

Fuel Evaporative Absorption (EVAP) System — Design Description
1. The evaporative emission (EVAP) system absorbs fuel vapors (mottled hydrocarbons) and when the engine is running, it releases them into the intake manifold, from where they are drawn into the intake ports, where they...

Fuel Evaporative Emissions (EVAP) System — Replacement of Elements
Warning! Gasoline is highly flammable. Therefore, when working on any part of the fuel system or EVAP system, extra precautions should be taken. Do not smoke or allow open flames or unshielded lights near the work area....

Positive Crankcase Ventilation (PCV) System — Description and Replacement of Elements
1. Positive crankcase ventilation system (PCV) (fig. 20.1, a-c) reduces hydrocarbon emissions by directing blow-by gases and vapors into the intake manifold where they mix with the intake air before the latter enters...

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