EXHAUST GAS RECIRCULATION VALVE (DC MOTOR) CHECK


CHECK ON OPERATING SOUND
note Carry out this check after checking that the diagnosis code is not stored. If the diagnosis code is stored, the exhaust gas recirculation valve (DC motor) could possibly not be checked correctly.

1.Start up the engine and run on at idle speed to allow the engine coolant temperature to reach at least 70°C.
2.When turning the ignition switch to the LOCK (OFF) position and stopping the engine, check that the operating sound "clicking noise" is heard from the exhaust gas recirculation valve three times.
3.If the operating sound is not heard, check the drive circuit of the DC motor.
note If the circuit is normal and the operating sound is not heard, it could possibly be caused by the failed exhaust gas recirculation valve.

OPERATION CHECK

1.Remove the exhaust gas recirculation valve.

2.
caution Be very careful when connecting, or incorrect connection can damage the exhaust gas recirculation valve position sensor.
Connect the terminal (+) of the sensor power supply (5 V) with the terminal No. 3 of the exhaust gas recirculation valve connector, and connect the terminal (-) of the sensor power supply (5 V) with the terminal No. 2.
3.A tester is to be connected between the terminal No.1 and No. 2.
4.Connect the terminal (+) of the power supply with the terminal No. 6 of the exhaust gas recirculation valve connector, and connect the terminal (-) of the power supply with the terminal No. 4. Confirm the exhaust gas recirculation valve is opened.
note At this time, the power supply voltage is to be 5 V. When the valve is not opened, increase the voltage 1 V by 1 V. For each voltage, current is to be applied within 5 seconds. Once the valve is opened, the voltage is not to be increased any more.
If the exhaust gas recirculation valve is not opened although the voltage applied to the motor is increased to 9V, clean the exhaust gas recirculation valve and carry out the operation check again. Despite this, replace the exhaust gas recirculation valve if it does not operate.

5.Confirm the voltage is changed between the terminal No. 1 and No. 2 together with the exhaust gas recirculation valve opening movement.
6.By the voltage changed, the DC is recognized as being normal.
7.Use a new gasket and tighten the installation bolt to the tightening torque.
Tightening torque: 48 ± 6 N·m

CLEANING THE EXHAUST GAS RECIRCULATION VALVE
1.
caution Do not use a solvent or detergent, which could enter the motor and cause it to malfunction.
Remove the exhaust gas recirculation valve and check that the exhaust gas recirculation valve is not stuck or clogged with carbon deposits. Use a wire brush to clean the valve if necessary.
2.Using a new gasket, install the exhaust gas recirculation valve by tightening its mounting bolts to the specified torque.
Tightening torque: 48 ± 6 N·m