Pinpoint Test G: DTC U0300:00

High-Voltage Converter/Inverter

Pinpoint Tests






Pinpoint Test G: DTC U0300:00

Refer to Wiring Diagram Set 12 (Fusion/Milan/MKZ, Fusion Hybrid/Milan Hybrid), Charging System for schematic and connector information. Diagrams By Number

Normal Operation

The DC to DC Converter Control Module (DC/DC) communicates with various modules over the High Speed Controller Area Network (HS-CAN). If the DC/DC determines a software incompatibility fault is present, it sets DTC U0300:00 and operates in offline mode (low-voltage set point and current limits at default settings). Periodic or constant heavy electrical loads of the 12-volt system may cause the 12-volt battery to become drained. Reduced functionality of 12-volt systems (headlamps, HVAC blower motor, etc.) may also be noticed.

- DTC U0300:00 (Internal Control Module Software Incompatibility: No Sub Type Information) - Sets due to a HS-CAN configuration error.

This pinpoint test is intended to diagnose the following:
- HS-CAN fault
- DC/DC



PINPOINT TEST G: DTC U0300:00

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G1 CARRY OUT NETWORK TEST


- Ignition ON.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Were any concerns identified by the Network Test?

Yes
REFER to Information Bus to diagnose the network concern.

No
GO to G2.

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G2 CLEAR DTCs AND CARRY OUT SELF-TEST OF THE DC/DC


- Using the scan tool, clear the DC/DC DTCs.
- Enter the following diagnostic mode on the scan tool: Self Test - DC/DC.
- Is DTC U0300:00 reported?

Yes
INSTALL a new DC/DC. REFER to Direct Current/Direct Current (DC/DC) Converter . CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.

No
Concern is not present at this time. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.

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