A6 Quattro Wagon V6-3.0L (AVK) (2002)
involving deployment of the passenger-side airbag.
If a malfunction of the RPM display at tachometer is detected, signal at the tachometer must be checked.
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Read measuring value block display group 001.
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Perform a road test.
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Check indication in display field -1-.
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Specification: The current speed must be indicated (compare with speedometer)
If the speed is being indicated, but not at instrument cluster:
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Replace instrument cluster.
If the speed is not indicated:
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Remove instrument cluster.
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Connect VAG1598A test box to blue 32-pin multi-pin harness connector using VAG 1598/25 adapter.
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Raise vehicle -via lift if possible-, until the front left wheel is free.
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Connect multimeter between terminal 28 and 9 for continuity test:
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Turn left front wheel.
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The multimeter must deliver short whistling signals.
If test is not OK:
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Check wire connection between instrument cluster and speed sensor according to wiring diagram.
If no malfunctions are found in wire:
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Replace speed sensor.