Milan FWD V6-3.0L (2010)
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Using the scan tool, clear the DC/DC DTCs.
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Enter the following diagnostic mode on the scan tool: Self Test - DC/DC.
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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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Pinpoint Test H: DTC U3003:16
High-Voltage Converter/Inverter
Pinpoint Tests
Pinpoint Test H: DTC U3003:16
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) monitors the 12-volt battery system voltage internally at the B+ terminal of the DC/DC. If the
voltage drops below 10.5 volts while the ignition is ON, the DC/DC sets DTC U3003:16 and requests CHECK CHARGING SYSTEM be displayed in
the message center. The DC/DC will be in standby mode (DC/DC disabled) and the 12-volt battery will eventually be drained. Reduced or no
functionality of 12-volt systems (headlamps, HVAC blower motor, etc.) may also be noticed.
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DTC U3003:16 (Battery Voltage: Circuit Voltage Below Threshold) - Sets if the 12-volt battery system voltage is less than 10.5 volts.
This pinpoint test is intended to diagnose the following:
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12-volt battery
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12-volt battery cables
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DC/DC
