E 320 Wagon (124.092) L6-3.2L (104.992) (1994)
Static test
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Remove instrument cluster. See: Instrument Cluster/Service and Repair
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Open cover (a) on connector housing.
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Check voltage with multimeter (003) between socket 4 (brown wire, ground) and socket 2 (black/violet wire with red dots, terminal 15). For this
check turn ignition/starter switch to position 2.
Specified value: Battery voltage: Use electrical connection set 201 589 00 99 00 for testing.
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Measure resistance with multimeter (003) between socket 4 (brown wire, ground) and socket 3 (white wire, sensor wire).
Specified value: 2 k ohms +/- 200 ohms. Use electrical connection set 201 589 00 99 00 for testing.
Dynamic test with frequency generator
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Connect frequency generator (032): Red test wire to socket 3 (white wire, sensor wire). Black test wire to socket 4 (brown wire, ground) Use
electrical connection set 201 589 00 99 00 for testing.
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Test sensor with (frequency generator in counter mode).
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Drive vehicle on dynamometer or on road. The frequency should increase continuously at increasing speed.
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Turn ignition/starter switch to position 2 (battery voltage).
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Test speedometer with (frequency generator in alternator mode, sine wave function). The speed reading should increase at increasing frequency.
Special Tool