EGR Control Solenoid: Testing and Inspection

5M-GE, 1986-88 7M-GE & 7M-GTE Engines

1. Connect terminals of vacuum switching valve to battery voltage.
2. Blow air into either pipe and ensure air flows from other pipe.
3. Disconnect battery voltage.
4. Blow air into either pipe and ensure air does not flow from other pipe.
5. If air flow is not as described, replace valve.
6. Using ohmmeter, check continuity between terminals and valve body.
7. If there is continuity, replace valve.
8. Using ohmmeter, measure resistance between terminals.
9. If resistance is not 38 to 44 ohms at 68°F, replace valve.