B110913 - B110913 PM2.5 Monitor Open Circuit

B110913 PM2.5 Rapid Measurement Instrument Open Circuit Fault Definition

Fault Code B110913 in the On-Board Diagnostics (OBD) system represents an abnormality judgment of a specific electrical connection status, specifically indicating an open circuit condition between the PM2.5 Rapid Measurement Instrument and its associated control unit. In the automotive electronic architecture, this control unit is responsible for collecting environmental particulate concentration data in real-time and sending feedback signals to the dashboard via communication buses. When this signal loop is detected to be in an "Open Circuit" state, it indicates a loss of physical connection or electrical integrity between the sensor and the control unit. The generation of this fault code means the system cannot receive valid PM2.5 Rapid Measurement Instrument data streams, causing relevant monitoring functions to enter a fail-safe mode.

Common Fault Symptoms

When B110913 fault code is activated, the vehicle dashboard and infotainment system may provide the following perceptible feedback to the driver:

• PM2.5 Rapid Measurement Instrument Function Failure: The air quality index (AQI) or PM2.5 value display area on the instrument screen fails to refresh, or displays error indicators such as "Fault" or "No Signal".
• Related Warning Indicators Light Up: Depending on the vehicle configuration, warning icons related to the air quality monitoring system may illuminate in the cockpit.
• Data Recording Interruption: The vehicle's onboard system stops digitizing real-time environmental particulate concentration data, leading to an inability to generate a history log of cabin air quality.

Core Fault Cause Analysis

Based on the technical characteristics of B110913 PM2.5 Rapid Measurement Instrument Open Circuit, the fault causes can be technically analyzed from three dimensions: hardware components, wiring connections, and controller logic:

• Hardware Component Level (PM2.5 Rapid Measurement Instrument itself): Permanent damage occurs to optical or electrochemical sensing elements inside the sensor, resulting in no signal voltage at the output terminal or abnormal resistance values, which are judged as open circuits by the control unit.
• Wiring and Connector Level (Physical Connection Integrity): The wire connecting the PM2.5 Rapid Measurement Instrument to the diagnostic controller breaks, short-circuits to ground due to worn insulation layers, or the harness interface loosens/retreats pins, causing an interruption in the electrical path.
• Controller Level (Logic Operation and Self-Check): An anomaly occurs in the input module responsible for signal reading inside the vehicle's main control unit; it cannot correctly parse feedback signals from the sensor, leading the system to erroneously judge a normal signal as an open circuit state.

Technical Monitoring and Trigger Logic

The setting of this fault code follows strict electrical logic control processes. The specific trigger mechanism is as follows:

• Monitoring Target: The system mainly monitors the communication line voltage level and impedance characteristics of the PM2.5 Rapid Measurement Instrument to judge the continuity of the signal path.
• Trigger Condition: The start condition for fault judgment is strictly limited after the ignition switch is placed in the ON position. At this time, the control unit executes power-on self-check programs, actively lowering or raising the measurement port level and waiting for sensor response.
• Judgment Logic: If during the above self-check process, the voltage signal of the detection line does not show an expected change within the specified range, or if the impedance value displays infinity (i.e., no current path), the system confirms a physical disconnection state in the line, immediately setting fault code B110913 PM2.5 Rapid Measurement Instrument Open Circuit and lighting up the relevant fault indicator lamp.