B110913 - B110913 PM2.5 Sensor Open Circuit

Fault Depth Definition

Fault Code B110913 indicates that an open circuit anomaly has been detected in the signal link of the PM2.5 sensor within the vehicle's body electronic control system. This sensor serves as a critical node in the air quality monitoring network, responsible for collecting environmental particulate concentration data in real-time and converting it into electrical signals transmitted to the central control unit. When the control unit detects a physical disconnection in the sensor power circuit or signal feedback loop via internal diagnostic routines, resulting in an inability to close the data loop, the system will record this fault code. This state indicates that electrical continuity between the control unit and the PM2.5 sensor has been lost.

Common Fault Symptoms

When Fault Code B110913 is stored, the driver or passengers may observe the following anomalies related to the air quality management system:

• Air quality display area data missing, showing zero, or displaying fixed constant values in the In-Vehicle Infotainment System or Instrument Panel.
• The automatic switching function of internal/external circulation in the Automatic Air Conditioning System no longer automatically adjusts based on real-time air quality data.
• The vehicle may be unable to execute pollution-based protection strategies, such as automatically closing the exterior air intake.
• PM2.5 sensor function failure.

Core Fault Cause Analysis

Based on system architecture and electrical principles, potential causes for setting this fault code can be categorized into the following three technical dimensions:

• Hardware Components: PM2.5 sensor failure, including internal integrated circuit damage, aging of sensing elements, or failure of power management modules, resulting in inability to output valid signals.
• Wiring/Connectors: Physical breaks or wear on the harness between the sensor and control unit, or oxidation, corrosion, or backing off of connector pins, causing signal loop interruption.
• Controller: Internal drive circuit abnormalities at the relevant signal input ports of the Body Control Module (BCM) or Air Conditioning Control Unit, resulting in inability to correctly identify sensor status (rare).

Technical Monitoring and Trigger Logic

The control unit monitors the sensor status via specific diagnostic strategies for real-time monitoring; specific monitoring targets and judgment logic are as follows:

• Monitoring Target: System continuously monitors voltage level state and loop impedance characteristics of the PM2.5 sensor signal line to confirm the integrity of the communication link.
• Trigger Fault Condition: Ignition switch set to ON position. Under this operating condition, the control unit powers up and initializes the sensor diagnostic program.
• Fault Setting Condition: PM2.5 sensor open circuit. When detected signal voltage or impedance values match open circuit characteristics (e.g., signal voltage pulled to limit value or loop impedance tends toward infinity), and duration exceeds calibration threshold, the control unit determines an open circuit fault and stores the code.