Exhaust Gas Recirculation: Testing and Inspection

Fig. 37 Placeing Finger Against Diaphragm.:

1. Start the engine and run at idle.
2. Place a finger against the EGR valve diaphragm Fig. 37.
3. Increase engine speed to about 2,000 rpm.
4. Check whether the diaphragm moves.

Cold engine: Diaphragm does not move
Warm engine (Coolant temperature above 55°C (133°F): Diaphragm moves.