EGR solenoid valve - check. Vehicles with TDI engine and manual transmission until the end of 1993
Checking the hose connections of the solenoid valve
1. Make sure the hoses on the solenoid valve are connected correctly (see illustration).
Checking the internal resistance of the solenoid valve
2. Disconnect the EGR valve plug.
3. Connect a highly sensitive and accurate ohmmeter to both contacts of the valve plug. The resistance should be 4-8 ohms. Otherwise, the valve is defective and must be replaced.
Solenoid valve power check
4. Connect a voltmeter to pin 2 on the connector and to «mass» (-) (see illustration).
5. Turn on the ignition. The voltmeter should show battery voltage. Otherwise, there is a break in the power wire.
EGR solenoid valve - check. Vehicles with TDI engine and manual transmission from the end of 1993 and vehicles with automatic transmission
The EGR solenoid valve is located on the front side of the air filter housing for vehicles with a TDI engine and manual transmission from the end of 1993 and for vehicles with automatic transmission (see illustration 5.0b).
Checking the internal resistance of the solenoid valve
6. Disconnect the EGR valve plug.
7. Connect a highly sensitive and accurate ohmmeter to both contacts of the valve plug. The resistance should be 14-10 P. Otherwise, the valve is defective and must be replaced.
Solenoid valve power check
8. Connect a voltmeter to pin 2 on the connector and to «mass» (-).
9. Turn on the ignition. The voltmeter should show battery voltage. Otherwise, there is a break in the power wire.
The procedure for testing the mechanical EGR valve is exactly the same as the procedure for testing this valve on TD engines.
Considering that the functioning of the EGR system of vehicles with TDI engines is largely determined by the control unit, the sensors of the power supply system can also be the cause of a defect in the EGR system. For this reason, it is recommended to print out the trouble codes and then check the corresponding sensor.
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