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A modern vehicle requires a vast array of sensors to keep things working smoothly. Some sensors let your vehicle know the kind of conditions it is operating under, while others focus on specific parts. The LLY mass air flow sensor has a simple but important job. It measures the amount of air going through the intake manifold. If your LLY MAF sensor is beginning to fail, you may have trouble starting your truck, or notice your engine hesitating or dragging when it is under heavy load. +Read more
The Duramax LLY boost sensor also monitors the intake manifold, gauging the boost pressure and relaying the information to the engine control module (ECM). This is one of the many pieces of information the ECM uses to judge fuel delivery, and the boost sensor is also vital to the turbocharger’s function.
Some sensors, like the LLY oil pressure sensor and the LLY fuel pressure sensor, can indicate problems in certain systems. If your oil or fuel pressure drops, it could indicate a leak in the system. Other sensors monitor solid parts. The LLY crank sensor collects information about the crankshaft’s rotational speed, which is then relayed to the ECM. The ECM can then use this information to set things like spark timing and fuel delivery.
Other parts have a more functional role. The LLY glow plug relay controls the flow of current to the engine’s glow plugs. The glow plugs themselves aren’t always active, but are often needed when trying to start the engine in a colder climate. The LLY intake heater is another vital part of a cold start system. These systems aren’t always vital, but large-capacity engines in colder climates are particularly reliant on cold start systems.
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