Diagnostic trouble code (DTC) information ECM-520B

Condition 

Fig 1: Identifying Air Conditioning (A/C) Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that there is no signal from the air conditioning (A/C) pressure sensor.

The diagnostic trouble code (DTC) can be diagnosed while the engine is running and while air conditioning (A/C) control is active.

Substitute Value 

• Predefined value for the air conditioning pressure.

Possible Source 

• Open-circuit in the signal cable
• Damaged A/C pressure sensor.

Fault symptom[s] 

• The air conditioning (A/C) system does not operate.