Corrado V6-2792cc 2.8L DOHC (1992)
Fig. 10 Checking Frequency Valve Duty Cycle
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Using a test harness that allows the frequency valve to remain connected while testing (VAG 1594 or equivalent) connect VAG 1367 tester (or a
suitable duty cycle meter) to the connectors as shown.
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START engine and raise RPM to about 2000.
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Duty cycle should be 32° ± 10% at 2000 RPM.
NOTE: The duty cycle is first triggered at 1000 RPM. Therefore, duty cycle will not register below 1000 RPM.
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If the frequency valve duty cycle is not within specifications:
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Check pre-test requirements
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Check the wiring, refer to VAG 1598 Pin Out Box/ Electrical Checks, repair as necessary.
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Turn ignition switch OFF, disconnect tester and test harness.
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Re-connect frequency valve harness connector.
