C006164 - IPB 0x223 Message Ay Signal Status Bit Error

DTC C006164 Fault Depth Definition

DTC C006164 represents a specific diagnostic trouble code within the Intelligent Power Brake System (IPB), specifically pointing to an anomaly in the status bit of the Ay signal contained within the IPB $0x223$ message. Within the vehicle network communication architecture, this fault code pertains to data integrity verification and functional safety logic on the Controller Area Network (CAN) bus. The "IPB 0x223 Message" refers to a critical data stream identifier transmitted by the Intelligent Power Brake Control Unit over the internal bus, used for real-time feedback on physical position, rotation speed of braking actuation motors, and system status. The Ay signal represents a specific signal bit (Signal Bit) within this message; an error in its status bit typically indicates a logical discrepancy between received commands and feedback states, or an abnormal judgment by the underlying hardware processing unit. This fault code serves to monitor internal health for the braking system, ensuring accurate response to braking request signals and preventing failure of braking strategies due to communication misjudgment.

Common Fault Symptoms

When the system detects DTC C006164 and has not entered a safe mode, observable vehicle behaviors may include:

• System Function Degradation: Partial functionality failure of the Intelligent Power Brake System, such as reduced electronic boost gain or malfunction of the electric vacuum pump.
• Instrument Panel Feedback: Warning indicators on the dashboard may illuminate, including brake system warning lights, yellow exclamation marks, or specific IPB warning icons.
• Performance Limit Mode: The vehicle may automatically limit maximum braking force output or disable advanced driver assistance functions (such as Automatic Emergency Braking) from intervention.
• Communication Status Indication: The On-Board Diagnostic (OBD) interface reads an error flag regarding the message status bit, indicating a mismatch in internal logic validation for the control unit.

Core Fault Cause Analysis

Based on raw data, the core cause of this fault is explicitly directed towards internal hardware or software logic issues within the Intelligent Power Brake Controller, which can be technically refined into the following dimensions:

• Internal Hardware Component Anomaly: The microprocessor (MCU) or memory units inside the IPB controller may experience errors, leading to logical confusion regarding the judgment of the Ay signal status, and an inability to correctly parse data frames within the $0x223$ message.
• Controller Logic Computation Error: The controller's firmware algorithm may encounter deadlock or calculation deviations when processing braking motor feedback loops, causing the Status Bit flip to deviate from expected design specifications.
• Internal Communication Line Anomaly: Although the fault is localized within the controller, internal circuit connections on the controller board may lead to signal voltage drift or pulse interference, triggering status bit error alarms.

Technical Monitoring & Trigger Logic

The diagnostic logic for this fault code relies on monitoring the status of specific bus messages; the specific trigger flow is as follows:

• Monitoring Target: The system prioritizes monitoring the status bit (Status Bit) of the Ay signal within the IPB $0x223$ message. This status bit provides real-time feedback on whether the internal operation logic of the braking control unit is correct.
• Monitoring Value & Range: When the actual state value of the Ay signal deviates from the preset normal logic range (e.g., expected as $Active$ but displayed as $Inactive$), the system will judge it as an error. At a binary level, this typically manifests as the status bit abruptly changing to an abnormal logic level, such as transitioning from $1$ to $0$ in non-compliance with self-check protocols.
• Trigger Condition: The fault is activated and logged only when the Ignition Switch is positioned to the ON position. The system must parse the message after the ignition cycle; if a persistent error flag exists for the message Ay signal status bit during dynamic monitoring, this fault code is generated.