Fusion FWD L4-2.5L Hybrid (2010)
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. See:
Diagrams/Electrical Diagrams/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.
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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:
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HS-CAN fault
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DC/DC
PINPOINT TEST G: DTC U0300:00
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G1 CARRY OUT NETWORK TEST
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Ignition ON.
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Connect the scan tool.
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Enter the following diagnostic mode on the scan tool: Network Test.
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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
