Diagnostic Trouble Code (DTC) Information ECM-830D

Condition 

Fig 1: Cooling Fans

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) uses LIN communication to communicate with the alternator control module (ACM).

The diagnostic trouble code (DTC) is stored if the alternator control module (ACM) transmits information to the engine control module (ECM) about an electrical fault in the generator (GEN).

The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute Value 

• None.

Possible Source 

• A battery charger with too high charge voltage has been connected previously
• Worn brushes (carbon)
• Damaged alternator control module (ACM)
• Damaged generator (GEN).

Fault symptom[s] 

• The "Generator not charging" warning lamp is lit when the engine is running
• The battery discharges
• Low rotation speed in the starter motor
• The electrolyte in battery boils with the engine running
• The headlamp bulb blows.