company news about ‌Working Principle of Automotive PM Sensor

1. ‌Core Function‌: The PM (Particulate Matter) sensor monitors the concentration of particulate matter in the exhaust system, providing critical data to the Engine Control Unit (ECU) for optimizing combustion efficiency and reducing emissions‌13.
2. ‌Detection Mechanism‌: Utilizing advanced electrochemical or optical principles, the sensor detects microscopic particles in exhaust gases. For example, some sensors measure changes in electrical conductivity caused by particle accumulation on a heated electrode‌34.
3. ‌Signal Output‌: The sensor generates voltage signals proportional to particulate levels. These signals enable the ECU to adjust fuel injection and manage regeneration cycles for diesel particulate filters (DPFs)‌13.

‌Maintenance and Replacement Guide‌

1. ‌Diagnostic Steps‌:
   • Use an OBD-II scanner to retrieve fault codes (e.g., P2463 for DPF blockage or PM sensor malfunction)‌7.
   • Analyze live data to verify abnormal particulate readings or sensor signal stability‌78.
2. ‌Replacement Procedure‌:
   • Disconnect the vehicle battery to prevent electrical hazards‌7.
   • Remove the sensor using specialized tools (e.g., anti-seize lubricant for corroded threads)‌7.
   • Install a new sensor, ensuring proper torque specifications (typically 30–50 N·m) to avoid damage‌7.
   • Reconnect the battery and perform an ECU reset or adaptation procedure‌78.
3. ‌Post-Installation Checks‌:
   • Clear fault codes and test-drive the vehicle to confirm normal sensor operation‌7.
   • Verify exhaust system integrity to prevent future contamination‌37.

‌Note‌: Always refer to manufacturer-specific service manuals for torque values and compatibility requirements‌78.