STEP 3. Check the EGR valve operation using special tool MB991658.
(1) Remove the EGR valve.
(2) Connect special tool MB991658 to the EGR valve. (All terminals should be connected.)
(3) Use the jumper wires to connect terminal power supply line of the EGR valve connector to the positive battery terminal.
(4) Check to ensure that the motor operates when the terminal EGRA line and EGRB line of the EGR valve connector are respectively connected to the negative battery terminal using a jumper wire.- Vibration should be present at each application of voltage to test clip combination.
(5) Then, use jumper wires to connect the terminal power supply line of the EGR valve connector to the positive battery terminal.
(6) Check to ensure that the motor operates when terminal EGRC line and EGRD line of the EGR valve connector are respectively connected to the negative battery terminal using a jumper wire.- Vibration should be present at each application of voltage to test clip combination.
(7) Reinstall the EGR valve, using a new gasket, and tighten to the specified torque.Tighten torque: 23 ± 6 N·m [17 ± 4 ft·Ib]
Is the EGR valve operating properly?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 4. Replace the EGR valve. Then go to Step 4.