Electronic Speedometer
Testing electronic speedometerA. Sensor test with multimeter
- Remove instrument cluster. Service and Repair
- Remove lid (a) from coupling housing.
- Test resistor between jack 3 (ground) and jack 5 (sensor wire) 2 kohms ± 200 ohms.
- Check voltage between jack 3 (ground) and jack 7 (terminal 15).
- Turn key to position 2 (battery voltage).
- 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
- Switch multimeter to (volt:range).
- 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
- Remove instrument cluster. Service and Repair
- Remove lid (a) from coupling housing.
- Test resistor between jack 3 (ground) and jack 5 (sensor wire 2 kohms ± 200 ohms).
- Test voltage between jack 3 (ground) and jack 7 (terminal 15).
- Turn key to position 2 (battery voltage).
- Connect function generator (see figure)
Red test wire to white sensor wire (jack 5)
Black test wire to brown ground wire (jack 3).
- Test sensor (function generator in counter mode).
- Test vehicle on roller test stand or on the road. The frequency value must continuously rise with increasing speed.
- Check speedometer (function generator in sinus function mode). The speed indication must increase with rising frequency.
Special Tool:
Commercially Available Testers:
