| Test the change-over valve for intake manifold flap -N239- |
| Only on engines with identification characters ATD |
| Special tools and workshop equipment required |
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| Hand vacuum pump (e.g. -V.A.G 1390 -) |
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| Hand multimeter (e.g. -V.A.G 1526 A-) |
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| Adapter cable set (e.g. -V.A.G 1594 C-) |
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| Test box -V.A.G 1598/31- |
Note | The functional testing of the change-over valve for intake manifold flap -N239- can also be undertaken using the actuator diagnosis → Chapter. |
| Check for proper operation |
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| Start engine and run in idle. |
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| Observe the vacuum setting element for intake manifold flap (2nd person required). |
| After the ignition is switched off the intake manifold flap must shut for approx. 3 seconds and then move back to its original position. |
| If the change-over with the intake manifold flap does not occur, perform the following tests: |
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| Check the change-over mechanics on the intake manifold flap for ease of movement. To this end activate the linkage by hand. The intake manifold flap must move easily. |
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| Check the functionality of the vacuum setting element using the hand vacuum pump. |
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| Check the vacuum line to ensure that it is attached properly and tightly. |
| If no fault is found on the mechanical components: |
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| Test the change-over valve for intake manifold flap -N239-. |
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| Disconnect plug from change-over valve for intake manifold flap -N239-. |
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| Specified value: 25....45 Ω |
| If the specified value is not reached: |
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| Replace the change-over valve for intake manifold flap -N239-. |
| If the specified value is reached: |
| If the lines are not found to be faulty: |
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| Replacing engine control unit -J248- → Chapter. |
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