EGR1 - Check EGR Control Solenoid
^ Key OFF.
^ Disconnect the Exhaust Gas Recirculation Control (EGRC) solenoid.
^ Disconnect the vacuum hoses.
EGR Control and Vent Solenoids:
^ Attach a hose to port A and blow into it to verify that air does not flow through port B.
^ Apply 12 volts and ground to the EGRC solenoid as shown.
^ Attach a hose to port A and blow into it to verify that air flows through port B.
^ Does the EGRC solenoid function properly?
YES -- Go to EGR2. EGR 2 - Check EGR Vent Solenoid
NO -- Replace the EGRC solenoid.