EGR Control Solenoid: Testing and Inspection

Three-way Solenoid Valve Test

1. Disconnect electrical connecters from water thermo switch and connect a jumper wire between the connectors.

2. Turn ignition switch to "On" position.

3. Disconnect vacuum hose from EGR valve and blow into the hose, Fig. 12. Check for air discharge at the three-way solenoid valve relief port. If air does not discharge, replace the three-way solenoid valve.

4. Turn ignition switch to "Off" position.

Fig. 12 - EGR Three-Way Solenoid Valve Test:

5. Remove jumper wire from the water thermo switch connectors and disconnect vacuum amplifier vacuum line from the three-way solenoid valve, Fig. 12.

6. Turn ignition switch to "On" position.

7. Blow into EGR valve hose. Check for air discharge at the vacuum amplifier port of the three-way control valve. If air does not discharge, replace the three-way solenoid valve.

8. If valve tests satisfactory, reconnect all vacuum hoses and electrical connections in original positions.