Diagnostic Trouble Code (DTC) Information ECM-520D

Condition 

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

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal from the air conditioning (A/C) pressure sensor is lower than the normal operating range.

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

Substitute Value 

• None.

Possible Source 

• Open-circuit in the power supply
• Open-circuit in the ground lead
• Damaged A/C pressure sensor.

Fault symptom[s] 

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