Operation Check
1. Remove the EGR valve.
2. Connect special tool MB991658 to the EGR valve.
3. Connect the battery positive (+) terminal to terminal No. 2.
4. caution | Connecting battery voltage to the EGR valve for a long time could damage the coil. |
Connect terminals 1 and 3 to the negative (-) terminal of the battery, in order to test whether the stepper motor vibrates (with a slight shudder), indicating that the stepper motor is operating.
5. Connect the battery positive (+) terminal to terminal No. 5.
6. caution | Connecting battery voltage to the EGR valve for a long time could damage the coil. |
Connect terminals 4 and 6 to the negative (-) terminal of the battery, in order to test whether the stepper motor vibrates (with a slight shudder), indicating that the stepper motor is operating.
7. If vibrations can be felt as a result of the test, the stepper motor is determined to be normal.