Diagnostic Trouble Code (DTC) Information ECM-A10B (2005)

Condition 

Fig 1: Cooling Fans

Courtesy of VOLVO CARS OF NORTH AMERICA.

The engine control module (ECM) communicates with the alternator control module (ACM) via a standardized serial communication method, Local Interconnect Network (LIN).

The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects interference in communication with the alternator control module (ACM).

The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute Value 

• The alternator control module (ACM) charges at a fixed voltage of 13.8 V.

Possible Source 

• Contact resistance and oxidation in the terminals
• Short-circuit between the LIN wiring
• Open-circuit in the LIN wiring
• Internal fault in another control module in the same part of the LIN network
• Damaged alternator control module (ACM)
• Generator with a charge regulator not intended for LIN communication installed.

Fault symptom[s] 

• The "Generator not charging" warning lamp is lit when the engine is running.