500SEL (126.037) V8-5.0L (117.963) (1984)
Speedometer Head: Testing and Inspection
Testing electronic speedometer
A. Sensor test with multimeter
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Remove instrument cluster. See: Instrument Cluster/Service and Repair
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Remove lid (a) from coupling housing.
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Test resistor between jack 3 (ground) and jack 5 (sensor wire) 2 kohms ± 200 ohms.
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Check voltage between jack 3 (ground) and jack 7 (terminal 15).
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Turn key to position 2 (battery voltage).
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Connect multimeter (see figure):
Red test wire to white sensor wire (jack 5).
Black test wire to brown ground wire (jack 3).
Use electric connection set 201 589 00 99 00
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Switch multimeter to (volt:range).
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Test vehicle on roller test stand or on the road. The voltage must continuously rise with increasing speed at approx. 40 km/h > (greater) 1V
B. Sensor and speedometer test with function generator
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Remove instrument cluster. See: Instrument Cluster/Service and Repair
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Remove lid (a) from coupling housing.
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Test resistor between jack 3 (ground) and jack 5 (sensor wire 2 kohms ± 200 ohms).
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Test voltage between jack 3 (ground) and jack 7 (terminal 15).