2. Turn off the ignition.
3. Observe the intake manifold flap adjusting lever (assistant needed).
4. The intake manifold flap should close after the ignition is turned off and then open again after approximately 3 seconds.
5. If the valve does not set to the required position, check: the damper control mechanism by moving the rod by hand; operation of the vacuum element using a hand vacuum pump; vacuum tubes for correct connection.
6. If no mechanical damage is found, check the intake manifold switch valve.
7. Disconnect the wiring connector from the intake manifold switching valve and measure the resistance between the valve contacts (figure 4A.19).
Set value: 25-45 Ohm.
Figure 4A.19. Disconnect the wiring connector from the intake manifold changeover valve and measure the resistance between the valve contacts.
8. If the specified value is not achieved, replace the intake manifold switching valve.
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9. If the set value is reached, set the multimeter to measure voltage and connect it to contacts 1 and 2 of the valve connector (figure 4A.20).
Figure 4A.20. If the set value is reached, set the multimeter to measure voltage and connect it to contacts 1 and 2 of the valve connector.
10. Start the engine and let it idle. Set value: battery voltage.
11. Turn off the ignition.
12. The voltage should drop to 0 after about 3 seconds.
13. If the voltage does not change. connect the VAG 1598/30 tester to the engine control unit wiring harness. Check the wires between the tester and the socket for interruption of the circuit: contact 2 + socket 2/01, contact 2 + socket 2/01 (Fig. 4A.20).
Specified value: max 1.5 ohm.
14. Check the connector wires for short circuits, short circuits to the positive or negative battery terminals.
Set value: ∞ Ohm.
15. If there are no faults in the wires, replace the CDI injection system control unit.
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