EGR Control Solenoid: Testing and Inspection

Fig. 34 Vacuum switching valve test connections.:

4A-GE, 4A-GEC, 4A-GEL & 4A-GELC Engines

1. Apply battery voltage to vacuum switching valve terminals, Fig. 34.
2. Blow air into pipe ``E,'' Fig. 34, and ensure air flows from pipe ``F.''
3. Disconnect voltage from valve, then blow air into pipe ``E,'' and ensure air flows from air filter at bottom of valve.
4. If air flow is not as described, replace valve.
5. Check for continuity between terminals and valve body and replace valve if continuity exists.
6. Measure resistance between valve terminals and replace valve if resistance does not measure 33-39 ohms at 68°F.