What are the reasons for the JMC SVS light being on and diesel engine power loss?
3 Answers
Here are the specific reasons for the JMC SVS light being on and diesel engine power loss: 1. Poor engine combustion state. 2. Engine knocking. 3. Poor quality of vehicle fuel. 4. Dirty engine cylinder interior with accumulated carbon deposits. 5. The electronic control unit cannot obtain engine data. Here is extended information about the JMC SVS light: 1. Function: The car SVS light is similar to the engine fault light. When the SVS indicator is on, it indicates that the engine control unit has detected an error signal from a sensor or that it is beyond the usage standard. When the ignition switch is turned on, the car SVS indicator light will come on for an automatic check and will turn off automatically after a few seconds. 2. Working mode: When the vehicle's ignition key is turned on, the onboard computer will perform a self-check and this light will come on, and it will turn off after the vehicle is started; when the engine ECU detects a fault, the SVS light will come on; if this light comes on while the vehicle is in motion, it indicates that there is a fault with the vehicle's engine.
I've encountered this issue several times. The SVS light indicates that you need to stop and check the vehicle as soon as possible. The most common reason for a diesel engine lacking power is a problem with the fuel system, such as a clogged fuel filter or a malfunctioning fuel pump, which prevents fuel from reaching the engine, resulting in insufficient combustion. Another possibility is a leak in the air intake pipe or a blocked air filter, reducing air intake and lowering combustion efficiency, making the vehicle struggle even on slopes. A faulty turbocharger can also cause similar symptoms, as insufficient boost pressure leads to weaker power output. Sensors like the intake pressure sensor or fuel level sensor failing can cause the engine control unit to misjudge and limit power to protect the engine. I remember one time when the light came on and the car felt sluggish; it turned out the fuel filter was dirty, and replacing it solved the problem. Don't skimp on filter maintenance—replace them every six months to prevent such issues. If the engine gets damaged, the repair costs can be shockingly high. Safety comes first; if the light comes on, pull over safely and don't force the car to keep going. Trying to save a little money can lead to much bigger losses.
From years of repair experience, there are quite a few reasons why the SVS light comes on and the engine loses power in JMC diesel vehicles. The most common cause is a dirty or clogged fuel filter, which restricts diesel flow and leads to insufficient fuel supply, making the engine underpowered. A heavily soiled air filter affecting air intake can also result in incomplete combustion and reduced power output. Issues in the turbo system, such as an intercooler leak or a stuck turbocharger causing unstable pressure, are frequent culprits as well. Additionally, if the electronic control unit receives incorrect signals, like a failed crankshaft position sensor, the engine may enter a protective mode with limited power. I recommend against DIY attempts—use a diagnostic tool to read trouble codes and pinpoint the issue. For simple cases, replacing the filter is a low-cost fix, with filters costing just over ten yuan each. More serious problems, like faulty fuel injectors or high-pressure fuel pump issues, require professional repair, but addressing them early prevents bigger losses. Regular maintenance, including cleaning the diesel system and replacing filters on schedule, can prevent such issues. If this happens while driving, stop and turn off the engine for safety.
