Diagnostic Trouble Code (DTC) Information ECM-951C

Condition 

Fig 1: Identifying Internal Atmospheric Pressure Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the actual idle speed deviates from the predefined parameters.

Substitute Value 

• None.

Possible Source 

• Search the fault cause in the air supply and fuel system (air leakage, blockages, etc.).

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit
• High idling speed.