EGR VALVE (DC MOTOR) CHECK


EGR VALVE OPERATING NOISE CHECK
note Carry out this check after confirming that the diagnosis code is not stored. If the diagnosis code is stored, the check on the EGR valve (DC motor) would not possibly be carried out correctly.
1.Start the engine and warm up. Allow the engine coolant temperature to reach above 70°C.

2.Turn the ignition switch to "LOCK" (OFF) position. Confirm that the operating noise of the EGR valve, such as the clicking noise, can be heard three times when the engine is stopped.
3.If the operating noise cannot be heard, check the driving circuit of the DC motor.
note If the operating noise cannot be heard although the circuit is normal, There can possibly be something wrong with the EGR valve.

EGR VALVE OPERATIONAL CHECK
1.Prepare the power supply (5 - 9 V) for the check.

2.Remove the EGR pipe "A".
3.Disconnect the EGR valve connector.

4.
caution At this time, the power supply voltage is to be 5 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. The supply voltage to the motor must be a maximum of 9 V.
Connect the terminal No. 6 of the EGR valve connector with the positive terminal of the power supply of the check (5 V). Connect the terminal No. 4 of the EGR valve connector with the negative terminal of the power supply of the check.
5.Apply the power supply of 5 V to the EGR valve. Confirm that the EGR valve is opened. If the valve is not opened, increase the voltage of the power supply for the check by 1 V each time.
note If the EGR valve is not opened although the voltage applied to the motor is increased to 9 V, clean the EGR valve and carry out the operation check again. Despite this, replace the EGR valve if it does not operate.
6.Install the EGR pipe "A" (Refer to ).

EGR VALVE VACUUM ACTUATOR CHECK

1.Remove the EGR pipe "B".

2.Connect the hand vacuum pump with the nipple of the vacuum actuator of the EGR valve.
3.Gradually applying the vacuum pressure, confirm through the hole produced by removing the EGR pipe "B" that the bypass valve shaft is normally operated. When the vacuum pressure reaches 70 kPa, confirm that the vacuum pressure is maintained.
4.If the bypass valve shaft is not operated, replace the EGR valve.
5.Install the EGR pipe "B" (Refer to GROUP 15 - Inlet Manifold - Removal and Installation <4N1>).

EGR VALVE CLEANING
caution
  • Do not use the solvent or cleaner because it enters to the motor and causes the operational malfunction.
  • The cleaned portion must be the valve only at the DC motor driven side from where all the circumference of the valve can be seen. The valve at the vacuum actuator driven side from where all the circumstance of the valve cannot be seen results in the non-uniform cleaning. Do not clean the valve at the vacuum actuator driven side because malfunctions can possibly happen such as the leak at the seat or foreign materials caught.
1.Remove the EGR valve.

2.Confirm that there is not the carbon stuck or accumulated on the EGR valve (at the DC motor driven side). If the carbon is stuck or accumulated on the valve (at the DC motor driven side), use the wire brush and so on to clean the valve.
3.Install the EGR valve (Refer to ).