Diagnostic Trouble Code (DTC) Information ECM-830B

Condition 

Fig 1: Cooling Fans

Courtesy of VOLVO CARS CORPORATION

The engine control module (ECM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network).

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) (charge regulator) 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) (charge regulator)
• A generator (GEN) and alternator control module (ACM) (charge regulator) are installed which are not suitable for LIN communication.

Fault symptom[s] 

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