300CE (124.050) L6-3.0L (103.983) (1989)
Speedometer Head: Testing and Inspection
Testing Electronic Speedometer model 124.034/036
A. Testing sensor with multimeter
Static test
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Remove instrument cluster. See: Instrument Cluster / Carrier/Service and Repair
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Remove 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 lead).
Specified value: 2 k ohms ± 200 ohms. Use electrical connection set 201 589 00 99 00 for testing.
Dynamic test with multimeter
Connect multimeter (003): Red test wire 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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Switch multimeter (003) on (range: volt)
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Drive vehicle on dynamometer or on road. The voltage should increase continuously at increasing speed up to approx. 40 km/h > 1 V.
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Close cover (a) on connector housing.
B. Testing sensor and speedometer with frequency generator