Saiou 3 still has fault light after EGR valve replacement

[LeCamila]

Saiou 3 experiencing this situation indicates an engine fault warning light, reminding the driver to visit a repair shop as soon as possible. Minor issues may include failing emission standards and unstable idling, while severe cases could affect vehicle performance. More details are as follows: 1. Sensor signal: The PCM monitors the input from the EGR valve pivot position sensor signal to ensure the valve responds correctly to PCM commands. When the EGR valve feedback signal voltage exceeds 0.2V for more than 20 seconds, the PCM will store fault information and illuminate the engine fault warning light. 2. Sticking or open circuit: Carbon deposits between the valve and valve port alter the pivot position, causing changes in the pivot position sensor's resistance value. When the PCM detects a discrepancy between the actual pivot position signal voltage and the set value, it will illuminate the fault warning light.