| 1. Turn a key in the ignition lock position of ON and connect the voltmeter to the plug 1 of the C150 socket |
| 2. The assistant has to rotate a car wheel, checking other wheel. At the same time the speed sensor will also rotate. |
| 3. Indications of the voltmeter have to change from 1 to 10 Century. |
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4. Otherwise replace the speed sensor.
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