C002192 Brake Booster Module Line Hydraulic Pressure Below Normal Value

Fault Depth Definition

DTC C002192 is a critical diagnostic identifier in the vehicle Intelligent Power Brake System (Intelligent Power Brake System, IPB), with its core role being the monitoring of the hydrodynamic state inside the brake booster module. The control unit continuously samples high-precision actual pressure values within the pipeline and compares them in real-time with the system's preset target pressure curve. When hydraulic levels are detected that cannot meet safety thresholds, the system determines "Below Normal". This fault code reflects abnormalities in mechanical executive components, sensor feedback, or physical loop integrity, directly threatening the stability of driver braking effectiveness and vehicle dynamics balance.

Common Fault Symptoms

Since the Intelligent Power Brake System adopts a partial function fail-safe strategy, when C002192 is recorded, owners may experience the following feedback at the driving experience level:

• Instrument Indication: The brake system warning light or IPB dedicated fault indicator light on the combination instrument panel lights up.
• Pedal Feel Impaired: During pedal operation, braking pedal travel may feel longer or return poor quality.
• Reduced Assist: Under emergency braking or continuous braking conditions, braking system response strength shows obvious attenuation.
• System Degradation: Vehicle enters restricted mode, enhanced functions of the Intelligent Power Brake System (such as Anti-lock Braking, Electronic Stability) may be temporarily disabled to ensure safety.

Core Fault Cause Analysis

According to the mapping logic of the diagnostic database, the generation mechanism of this fault can be summarized into the following three technical dimensions:

• Hardware Component Level: The pressure sensor integrated inside the Intelligent Power Brake Controller malfunctions, causing signal acquisition distortion or failure; or internal hydraulic pump/accumulator and other actuating elements within the module fail to establish normal pressure due to mechanical wear.

• Lines and Physical Connection Level: There are physical leakage points in the braking pipeline causing high-pressure hydraulic oil loss; or air is mixed into the pipeline during maintenance, repair (air lock phenomenon), causing changes in liquid medium density leading to distorted pressure transmission.

• Controller Logic Operation Level: When the Intelligent Power Brake Controller monitors hydraulic status, its internal algorithm determines that "Set Fault Condition" is met. That is, there is a non-linear deviation between the reference pressure model inside the control unit and the actual feedback values, exceeding the system's allowable safety tolerance range.

Technical Monitoring & Trigger Logic

The generation of this fault code follows strict ECU diagnostic timing and threshold comparison logic:

• Monitored Target Parameters: Hydraulic actual pressure value ($P_{actual}$) collected in real-time by the Intelligent Power Brake Controller and the system's preset target pressure curve ($P_{set}$).

• Numerical Determination Standard: The specific trigger condition for fault determination is when the deviation between the Intelligent Power Brake Controller hydraulic actual pressure value and set pressure exceeds the set range. If the following logical relationship is met, the system will record the fault code: $$|P_{actual} - P_{set}| > \Delta P_{threshold}$$ Where $\Delta P_{threshold}$ represents the unacceptable deviation threshold defined by the system.

• Operational Trigger Conditions: The diagnostic program activates monitoring mode only when the ignition switch is in the ON position (start switch placed in ON position). Once control logic confirms actual pressure remains below normal baseline and exceeds tolerance under these static or dynamic conditions, fault trigger determination is completed.