Emission control system Toyota RAV4 1 (XA10)

General information about the emission control system
To prevent environmental pollution from incompletely burned and evaporating gases, to maintain the dynamic characteristics of the car, with economical fuel consumption, a variety of exhaust gas toxicity reduction...

Technical characteristics of the toxicity control system
Technical characteristics of the sensors of the system for monitoring and reducing the toxicity of exhaust gases are given in table. 7.1, 7.2, 7.3, 7.4.

On-Board Diagnostic System (OBD)
Portable scanners are used to analyze engine management systems. All models are equipped with an OBD-II on-board diagnostic system. This system consists of an on-board computer called the engine control unit (PCM), and...

Information sensors
oxygen sensors (O2S — Oxidant Sensor) - are a solid electrolyte of ZrO - ceramics. At high temperatures, this electrolyte becomes electrically conductive and generates a characteristic galvanic charge, which is an...

Executive devices
EFI main relay electronic fuel injection system (EFI — Electronic Fuel Injection) supplies voltage to the fuel pump. The relay is controlled by two electrical circuits. On the first circuit, control is carried out from...

OBD-II System Fault Codes
If the CHECK ENDINE warning lamp comes on, this indicates a malfunction during the last two trips. Pic. 7.3. Location of the 16-pin data link electrical connector (DLC) OBD-II system diagnostic codes can be retrieved...

The engine control unit (PCM)
Attention! Cars are equipped with security systems (SRS), including airbags and seat belt tensioners. Before carrying out work near the shock sensors, the instrument panel and the steering column, first disconnect the...

Throttle position sensor replacement (TPS)
Throttle position sensor (TPS) located at the end of the throttle valve axis on the throttle assembly. By monitoring the output voltage from the TPS, the PCM regulates fuel delivery based on throttle opening angle...

Replacing the intake manifold absolute pressure sensor on models from 2001
The intake manifold absolute pressure (MAP) sensor measures the intake manifold air pressure, which fluctuates with engine load and vehicle speed, and converts the information into a voltage output. Output voltage...

Replacing the air flow meter sensor (MAF) on models since 2001
The air flow meter sensor is located on the air intake pipe. The air flow enters the motor through a heated wire meter forming part of the bridge circuit. The current passing through this wire element maintains its...

Replacing the engine air temperature sensor (IAT) on models up to 2001
On models from 2001, the engine intake air temperature sensor is built into the air flow meter sensor (MAF). The temperature sensor of the air entering the engine is a thermistor, i.e. a resistor whose resistance...

Replacing the coolant temperature sensor (ECT)
The coolant temperature sensor is a thermistor, i.e. a resistor whose resistance changes with temperature. As the temperature decreases, the resistance of the sensor increases and vice versa (see technical data)....

Replacing the crank angle sensor (CKP)
Crank angle sensor (CKP) determines the timing of fuel injection and ignition for each cylinder. On models up to 2001 The sensor is located under the timing belt cover, next to the crankshaft pulley. Replacing the crank...

Replacing the camshaft position sensor (CMP) on models since 1998
Pic. 7.14. Camshaft position sensor (CMP) on models up to 2001: 1 - electrical connector; 2 - camshaft position sensor (CMP) Pic. 7.15. Camshaft position sensor (CMP) on models since 2001: 1 - sealing ring; 2 - camshaft...

Replacing oxygen sensors (O2S) and air-fuel mixture (A/F Sensor)
The vehicles are equipped with an OBD-II on-board diagnostic system in the engine management system, which has feedback between the oxygen sensor and the engine control unit (PCM). This is achieved by installing a...

Replacing Knock Sensors
Knock sensors must be replaced with a cold engine. The engine can be damaged as a result of detonation that occurs when the fuel mixture is burned. High compression ratios, which improve the fuel efficiency of the...

Vehicle Speed Sensor Replacement (VSS)
Pic. 7.21. Vehicle speed sensor location (VSS) at the top of the gearbox housing on models up to 2001 Pic. 7.22. Vehicle speed sensor location (VSS) at the top of the gearbox housing on models from 2001 Vehicle speed...

Idle Speed Control Valve Replacement (IAC)
The idle speed is set at the factory and does not require adjustment during vehicle operation. However, when replacing the throttle assembly, if the idle speed adjustment screw was rotated, it is necessary to check and...

Forced crankcase ventilation system (PCV)
Pic. 7.25. Scheme of forced crankcase ventilation: 1 - PCV valve; 2 - crankcase gases; 3 - fresh air The forced crankcase ventilation system ensures the suction of crankcase gases and fuel vapors from the crankcase into...

Exhaust gas recirculation system (EGR) on models since 2001
To reduce the content of nitrogen oxide in the exhaust gases, part of the gases are directed by the exhaust gas recirculation system to the intake manifold, resulting in a lower combustion temperature. The exhaust gas...

Evaporative Emission System (EVAP)
Evaporative Emission System (EVAP) accumulates fuel vapors in a special container with activated carbon - an absorber, and when the engine is running, mixes them with fresh air and supplies them to the engine cylinders,...

Catalytic Converter — Replacement
On models since 2001, the catalytic converter is integrated with the exhaust manifold. All cars are equipped with catalytic converters to reduce the amount of harmful substances emitted into the atmosphere with exhaust...