B110F09 - B110F09 PM2.5 Rapid Measurement Device Solenoid Valve Failure

Fault Definition Details

Fault Code B110F09 indicates that a failure of the PM2.5 Monitor solenoid valve has been detected in the vehicle Body Control Network. As an actuator, this solenoid is responsible for physically controlling the opening and closing of the air sampling path, serving as a critical component ensuring normal operation of the PM2.5 Monitor. The control unit sends pulse signals to the solenoid valve via the drive circuit and monitors its feedback loop. When there is a mismatch between the instruction output and the physical response, the system determines that the air path control logic has been interrupted, thereby storing this fault code.

Common Fault Symptoms

When B110F09 fault code is activated, drivers or passengers may perceive the following system anomalies:

• PM2.5 Monitor function failure, unable to display indoor air quality index in real-time.
• The automatic climate control system's air purification mode cannot enter working status.
• The vehicle information entertainment system or instrument cluster may display warning icons related to air quality sensors.
• The interior air circulation system may remain in a fixed mode by default, unable to switch automatically based on air quality.

Core Fault Cause Analysis

Based on system logic, potential factors leading to PM2.5 Monitor solenoid valve failure can be categorized into the following three technical dimensions:

• Hardware Components: PM2.5 Monitor failure, specifically manifested as abnormal internal impedance of the solenoid valve coil or physical sticking of the mechanical valve core due to dust accumulation.
• Wiring/Connectors: The wiring harness between the control unit and the monitor may have open circuits, short circuits, or signal attenuation caused by excessive contact resistance at electrical connector terminals.
• Controller: The drive chip of the upstream control module may detect overcurrent or overload protection, thereby logically cutting off power supply to the PM2.5 Monitor solenoid valve.

Technical Monitoring and Trigger Logic

The system determines whether the fault is valid through specific electrical logic and operating conditions:

• Monitoring Target: Current load characteristics of the solenoid valve drive circuit and feedback signal status.
• Fault Trigger Condition: Ignition switch placed in $ON$ position.
• Judgment Logic: When the vehicle power mode switches to $ON$ position, the control unit executes a power-on self-check program. If valid electrical feedback is not received within the preset time window after sending a drive command to the PM2.5 Monitor solenoid valve during this period, the fault condition is set as PM2.5 Monitor solenoid valve failure, and relevant fault indicators are lit.