Exhaust gas recirculation system [Toyota Camry XV20]

The system is designed to reduce the content of nitrogen oxides in exhaust gases. This is achieved by reducing the combustion temperature by redirecting part of the gases into the combustion chamber. The set of system devices and the testing procedure for 4- and 6-cylinder engines are slightly different.

Examination

4-cylinder engines

Location of the EGR valves to be tested on a 4-cylinder engine

Recirculation valve

1. Start the engine, disconnect the hose from the valve and connect a vacuum pump in its place.



2. When creating a vacuum in the valve, the engine operation should become unstable, and the vacuum gauge reading should not fluctuate. Otherwise, check the cleanliness of the intake manifold or replace the valve.

Control valve filter

1. Remove the valve cap.



2. Remove the control valve and take out the filters. The rough surface of the outer filter should be facing outward. Blow out the filters and put them back in place.

Recirculation system

1. Disconnect the hose from the recirculation valve and install a vacuum gauge between the valve and the pneumatic distributor.





2. Start the engine and connect terminals TE1 and E1 on the diagnostic connector.

At an engine temperature of 55°C and 2500 rpm there should be no vacuum.

On a warm engine at 2500 rpm there should be a slight vacuum.

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3. Connect the R connection to the intake manifold with a piece of hose. At 2500 rpm there should be a significant vacuum.

4. Check the resistance of the pneumatic distributor, which should be 33–39 Ohms (see fig. Location of the tested valves of the recirculation system on a 4-cylinder engine). Otherwise, replace the pneumatic distributor.

6-cylinder engines

Recirculation valve

The testing procedure is similar to that described above for a 4-cylinder engine.

Temperature sensor

Disconnect the connector (the recirculation system temperature sensor is screwed into the intake pipe) and check the resistance of the sensor at different temperatures (see subsection 7.2.2.).

EGR valve position sensor

Disconnect the connector and check the resistance of the sensor (see subsection 7.2.2.). To check the resistance of the recirculation valve position sensor, connect an ohmmeter to terminals E2 and VC.

Pneumatic distributor

Location of the air distribution valve on a V6 engine

Replacement

Recirculation valve

Disconnect the hose and tube from the valve (on V6 engines). See the picture on the left. Unscrew the bolts (indicated by arrows in the figure on the right) and remove the valve.

Installation of the recirculation valve

Control valve

Label and disconnect the hoses. Remove the control valve from the bracket.