Charging System

WARNING: This page is about a different car, the 2016 Ford Transit-350 HD, 2016 Ford Transit-350, 2016 Ford Transit-250, and 2016 Ford Transit-150. However, it is still accessible from the selected car via links, so may be relevant.

The PCM controlled Smart Charge charging system determines the optimal voltage setpoint for the charging system and communicates this information to the voltage regulator. The Smart Charge charging system is designed to set a DTC when a charging system fault is present. All of the Diagnostic Trouble Codes (DTCs) can set continuous faults, but not all Diagnostic Trouble Codes (DTCs) set as on-demand faults. Use the diagnostic scan tool to view all available Parameter Identifications (PIDs).

The PCM simultaneously controls and monitors generator output. When the current consumption is high or the battery is discharged, the PCM raises engine speed as needed to increase generator output. The generator charges the battery and at the same time supplies power for all of the electrical loads that are required. The battery is charged more effectively at a higher voltage when the battery is cold and at a lower voltage when the battery is warm.

The PCM turns off the generator during cranking to reduce the generator load and improve cranking speed. Once the engine starts, the PCM slowly increases generator output to the desired voltage.

The PCM reports any charging system faults and sends a message through the HS-CAN to the BCM. The BCM then sends a message over the MS-CAN to the IPC. Any charging system fault detected by the PCM results in 1 or more Diagnostic Trouble Codes (DTCs) being set and the PCM GENFIL PID having a status of ON. The IPC illuminates the charging system warning indicator and the message center may display a corresponding message to notify the driver of the condition.

Under certain circumstances, the charging system may have a concern but still charge the battery while the vehicle is running. The LIN is normally used to initiate charging, but with a fault on this circuit, the generator can self-excite, or begin charging on its own. The engine may need to operate at more than 2, 000 RPM momentarily for this to occur. The charging system warning indicator illuminates, the corresponding message is displayed and the generator operates in a default mode (approximately 13.5 volts).