Description:

The error code ETC 000871.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input for the refrigerant pressure sensor (B130, lead 2019). This high voltage indicates a short to a supply lead somewhere in the circuit, which can disrupt the accurate reading of refrigerant pressure.

Reaction:

When this fault is detected, the control unit may disable the air conditioning system or reduce its efficiency to prevent damage to the refrigerant system and ensure safety.

Recommendations:

Inspect Electrical Connections:

• Check for Shorts: Examine the wiring and connectors for the B130 sensor for signs of shorts to the power supply. Look for damaged insulation, pinched wires, or loose connections.
• Measure Voltage: Use a multimeter to measure the voltage at the sensor input. Ensure it is within the normal operating range (typically below 5 volts).

Sensor and Circuit Testing:

• Test the Sensor: Verify the operation of the B130 refrigerant pressure sensor using diagnostic tools. Replace the sensor if it is found to be faulty.
• Inspect the Circuit: Trace the circuit from the control unit to the sensor to identify any points where the wiring might be exposed or damaged.

Repair or Replace Components:

• Repair Damaged Wires: Fix any identified shorts or damaged wiring. Ensure all connections are secure and properly insulated.
• Replace Faulty Components: Replace the B130 sensor or any other components if they are found to be contributing to the high voltage condition.

Note:

Regular inspection and maintenance of the air conditioning system’s electrical components can help prevent voltage-related issues. Ensuring proper routing and securing of wires can reduce the risk of shorts and enhance the reliability of the system.