Exhaust Gas Recirculation: Testing and Inspection

Fig. 156 EGR Test:

EXHAUST GAS RECIRCULATION VALVE
Apply vacuum to fitting on valve.
^If the diaphragm does not hold vacuum or valve spring does not lift replace valve.

Fig. 46 Solenoid Test:

EGR SOLENOID FUNCTION TEST
Apply voltage to the solenoid terminals as shown above and check air passages for continuity.
CAUTION: Reversing polarity will damage the solenoid.
^Replace solenoid if it fails above test.