B110D09 - B110D09 PM2.5 Rapid Measuring Instrument Photoelectric Receiving Module Failure

Fault Code Detailed Definition

Fault code B110D09 points to the core sensing unit within the vehicle air quality monitoring system, specifically defined as PM2.5 Rapid Measurement Sensor optical receiving module failure. In modern onboard environmental control systems, the PM2.5 Rapid Measurement Sensor undertakes the critical task of real-time collection of particulate matter concentration inside and outside the cabin. Its internal optical receiving module operates based on the light scattering principle, responsible for converting scattered light signals generated after laser irradiation of particles into electrical signals and transmitting them to the Vehicle Body Control Unit for logic calculation. When the control unit detects that the photoelectric receiver circuit cannot establish an effective communication link, or when the received signal characteristics do not match the preset physical model, the system will determine module functional failure and store this diagnostic fault code.

Common Fault Symptoms

When the vehicle system records B110D09 fault code, the driver or passenger may perceive the following functional anomalies related to air quality monitoring:

• Data Display Abnormalities: Air Quality Index (AQI) and PM2.5 concentration values on the center control screen or instrument cluster display as blank, fixed values, or error prompts.
• Function Loss: PM2.5 Rapid Measurement Sensor function failure; system unable to perform real-time monitoring of current environment's particulate matter concentration.
• Linkage Strategy Interruption: Automated functions relying on air quality data (such as automatic switching to interior recirculation mode, air purification system automatic activation) may not operate according to expected logic.

Core Fault Cause Analysis

Based on the logical definition of the fault code, potential technical causes leading to B110D09 can be categorized into the following three dimensions:

• Hardware Components: The optical receiving module inside the PM2.5 Rapid Measurement Sensor exists physical damage, for example photodiode aging, laser emission source power decay, or optical lenses covered by dust/oil leading to light path obstruction, unable to complete effective photoelectric conversion.
• Wiring/Connectors: Wiring harnesses connecting the PM2.5 Rapid Measurement Sensor and Vehicle Controller may have open circuits, ground/power short circuits, or electrical connector pin oxidation/looseness, leading to physical interruption of signal transmission path.
• Controller: Although fault points mainly to sensor end, if control unit's signal processing circuit has logic calculation errors, unable to correctly parse data frames uploaded from photoelectric module, may also trigger this fault determination.

Technical Monitoring and Trigger Logic

System uses specific working condition monitoring and signal validation logic to determine if the fault is established, specific technical details as follows:

• Monitoring Target: Control unit continuously monitors signal feedback status of optical receiving module, communication integrity, and data frame validity.
• Fault Trigger Condition: Ignition switch placed in ON position. System only activates monitoring program after ignition switch is connected, to ensure vehicle electrical system is within working voltage range.
• Fault Setting Condition: PM2.5 Rapid Measurement Sensor optical receiving module failure. When control unit is under ignition switch ON state, unable to obtain valid pulse signals or data flow conforming to protocol standards from photoelectric receiver end for continuous multiple sampling cycles, fault code is formally set and stored.