Diagnostic Trouble Code (DTC) Information ECM-8300

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) indicating that the temperature of the generator (GEN) is above or certain value of indicating a mechanical fault (the engine speed (RPM) is above a certain value but the generator (GEN) is stationary).

The diagnostic trouble code (DTC) can be diagnosed when the engine speed (RPM) is 600 RPM or higher.

Substitute Value 

• None.

Possible Source 

• Defective auxiliaries belt and belt tensioner
• Damaged freewheel
• Damaged generator (GEN)
• The air ducts for the generator (GEN) are blocked.

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
• Noise from the generator (GEN)
• Noise from the belt transmission
• The engine judders under acceleration.