What does it mean when the SVS light is on in a JMC Shunda?
2 Answers
Introduction to the reasons for the SVS light being on in a JMC Shunda: 1. Poor engine combustion state; 2. Engine knocking; 3. Poor fuel quality; 4. Dirty engine cylinder interior with accumulated carbon deposits; 5. The electronic control unit cannot obtain engine data. Below is an introduction to electronic fault types: 1. Interference caused by improper grounding: In a single-power circuit, the opposite electrode is usually used as its potential reference point, i.e., when powered by a positive power supply, the negative terminal of the power supply serves as the potential reference point. If powered by a negative power supply, the positive terminal is the reference point. For a bipolar power supply, the reference point is the node where the positive and negative terminals are connected in series. To prevent interference in electronic circuits, grounding components are typically connected to the power supply's reference point. Additionally, to avoid interference from digital signals on analog signals, digital signal ground and analog signal ground should be set separately. Improper grounding or excessive grounding resistance can create ground potential difference noise, affecting the circuit's normal operation. 2. Poor DC power supply filtering: The ripple voltage used during electronic equipment operation is usually converted from 50 Hz AC power after filtering, rectification, and voltage stabilization. If the ripple voltage suddenly increases during electronic circuit operation, it can cause interference, which typically follows a pattern. To avoid such interference, circuits can opt for power supplies with low noise and low output impedance, and increase the power filter capacity in amplifiers. 3. Inductive interference: Interference sources couple interference signals into the circuit through inductance, distributed capacitance, etc. To avoid such interference, shielding measures can be taken, such as connecting the shielding shell to the ground to suppress electromagnetic interference propagation in space and cut off the transmission path of interference signals.
When the SVS light on the Jiangling Shunda's dashboard comes on, it usually indicates an engine problem. I've been in the transportation business for over a decade and have used the Shunda the most. When the SVS light comes on, it's mostly due to a fuel system issue, such as a clogged diesel filter causing fuel supply problems or a faulty sensor like an oxygen sensor malfunctioning. Last time my truck had this light come on while on the highway, the power immediately dropped, fuel consumption skyrocketed, and it had to be towed to the shop where replacing a sensor fixed the issue. I advise you not to keep driving with it on, as it can damage the engine and waste fuel. When you have time, check the OBD diagnostic codes to identify the root cause. For regular maintenance, pay attention to changing filters and inspecting the electrical system—prevention is better than repair, and safe driving is more important than anything else.
