What are the reasons for the engine fault light in Shandeka trucks?
3 Answers
The reasons for the engine fault light in Shandeka trucks may include turbocharging issues, unqualified exhaust emissions, clogged fuel injectors, throttle position sensor problems, and in some vehicles, transmission system faults are also indicated through the engine fault light. The specific reasons are as follows: Sensor issues: Sensors include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the vehicle's ECU cannot accurately obtain engine data, which will cause the engine fault light to illuminate. Turbocharging issues: Intake turbocharging pipelines and turbochargers can also cause the engine fault light to illuminate. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metal noises, and blue or black smoke from the exhaust pipe. Exhaust issues: Rear oxygen sensors, catalytic converters, exhaust camshafts, and bearings. The most common issue is catalytic converter failure causing the engine fault light to illuminate. Factors such as using leaded gasoline, lead or silicon-based lubricant additives, physical damage to the catalytic converter, and engine fuel system faults can easily lead to catalytic converter failure. Anti-theft system: If the vehicle's electronic anti-theft system malfunctions or the anti-theft controller does not match the engine electronic controller, the anti-theft system can also cause the engine to malfunction, along with the engine fault light illuminating. Solutions: If this fault occurs, the vehicle should not be driven: Check if the vehicle's coolant is low, if the engine oil needs to be replaced or is low, clean the throttle, clean the intake tract, check if the spark plugs are functioning properly, and if the ignition coils are normal. The vehicle should not be driven with this fault.
I've driven a Sinotruk for over a decade, and the most common reason for the engine warning light coming on is an issue with the emission system. For example, the urea nozzle might be clogged, or the DPF (Diesel Particulate Filter) may require regeneration. In such cases, the vehicle might experience limited torque and reduced power, and the dashboard may display a regeneration prompt. Another frequent cause is fuel-related problems. Last time I filled up with substandard diesel from a private gas station, the light came on the very next day, and both the fuel pump and injectors were prone to damage. Thirdly, various sensors can cause trouble—precision components like the exhaust temperature sensor or oxygen sensor might malfunction and trigger false alarms. Fourth, it could be due to an air intake system leak or a clogged air filter. Lastly, don’t overlook minor issues like loose electrical connectors. My advice is to pull over immediately when the light comes on and use a diagnostic tool to read the fault codes for the most accurate diagnosis.
As someone who studies trucks all day, the reasons for the engine warning light coming on must be examined from the core systems. On the emissions side, substandard urea concentration is the most common trigger for alerts, and SCR system abnormalities can limit power. In the fuel system, wear on the high-pressure fuel pump or carbon buildup in the injectors are frequent issues. Among the sensors, the common rail pressure sensor and intake air temperature sensor are particularly delicate. Mechanical issues like turbocharger pressure leaks can also cause it. I always keep an OBD scanner handy to read data streams and check real-time exhaust temperature values. Last month, I helped a friend fix a warning light issue caused by a worn-out crankshaft position sensor wiring harness. During repairs, it's crucial to carefully inspect the wiring harness routing.
