20706327
RPM/TDC Sensor
Volvo

Engine timing and speed information is captured by a sensing element that monitors the rotation and position of the crankshaft, delivering a pulse train to the engine control unit. This data is essential for precise fuel delivery, ignition timing, and synchronization across cylinders, directly affecting torque, idle stability, and cold-start performance. In heavy-duty operation, accurate position sensing improves response under load, preserves combustion efficiency, and reduces emissions by ensuring optimal valve overlap and piston travel timing. The sensor endures harsh thermal cycling, exposure to contaminants, and vibration, so robustness is key. Diagnostic trouble codes related to this input can cause limp modes or reduced power, highlighting the importance of a reliable, well-seated connection and clean electrical interface. Regular inspection helps ensure clean signal integrity, proper wiring harness routing, and secure attachment to its mounting point. By maintaining consistent sensing, the vehicle experiences smoother acceleration, predictable fuel economy, and longer service life for the propulsion and aftertreatment systems.