This tachograph speed sensor accurately measures the vehicle's speed, transmitting this data to the tachograph unit for recording and display. It is essential for regulatory compliance and monitoring driver behavior, differing from a worn sensor by providing a consistent and reliable speed signal. Operators may notice inaccurate speed readings on the tachograph, a speed sensor warning light, or issues with cruise control functionality when this part fails.
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Disconnect main battery before working on electrical components. Use dielectric grease on all connector pins. Check ground connections — most electrical faults trace to poor grounds. Test with multimeter before installing new parts.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The first indication of a faulty tachograph speed sensor is often inaccurate or fluctuating speed readings displayed on the tachograph. If ignored, this can lead to inconsistent logging of driving time and distance, potentially causing compliance issues. The risk is non-compliance with regulations and unreliable data for fleet management.
Ensure the mounting surface where the sensor engages with the transmission or driveshaft is clean and free of metal shavings. Avoid forcing the sensor into its mounting hole, as this can damage the sensor or its internal components.
When replacing the speed sensor, inspect the transmission output shaft for wear or damage and check the condition of the wiring harness.