Description:

The error code ETC 000871.04 is triggered when the control unit measures 0 volts at the signal input for the refrigerant pressure sensor (B130, lead 2019). This indicates a possible open circuit or disconnection in the wiring, resulting in no voltage being detected at the sensor input.

Reaction:

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

Recommendations:

Inspect Electrical Connections:

• Check for Open Circuits: Examine the wiring and connectors for the B130 sensor for signs of disconnection or open circuits. Look for broken wires, loose connections, or corroded terminals.
• Measure Voltage: Use a multimeter to measure the voltage at the sensor input. Ensure there is a proper connection and voltage is present.

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 defective.
• Inspect the Circuit: Trace the circuit from the control unit to the sensor to identify any points where the wiring might be broken or disconnected.

Repair or Replace Components:

• Repair Broken Wires: Fix any identified open circuits or disconnected 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 causing the low voltage condition.

Note:

Ensuring the integrity of the electrical connections in the air conditioning system is crucial for reliable operation. Regular maintenance and inspection can help identify potential issues before they lead to faults and system downtime.