Milan FWD V6-3.0L (2010)
Pinpoint Tests
Pinpoint Test D: DTC P0AFA:13
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 high voltage available from the High Voltage Traction Battery (HVTB). The DC/DC
compares that high-voltage reading with the high voltage available to the Transmission Control Module (TCM), which is communicated via a High
Speed Controller Area Network (HS-CAN) message. When the DC/DC compares its available high voltage to that available to the TCM and determines
the difference to be 150 volts or more, it will set DTC P0AFA:13 and request the CHECK CHARGING SYSTEM message be displayed in the message
center. The DC/DC will attempt to maintain operation. An open high-voltage, low-current fuse (located in the high-voltage Bussed Electrical Center
(BEC)) may cause the DC/DC and Air Conditioning Compressor Module (ACCM) to be non-functional, resulting in the 12-volt battery eventually
becoming drained. Reduced or no functionality of 12-volt systems (headlamps, HVAC blower motor, etc.) may also be noticed.
-
DTC P0AFA:13 (Hybrid Battery System Voltage Low: Circuit Open) - Sets when the difference in high voltage between the TCM and DC/DC is
greater than 150 volts.
This pinpoint test is intended to diagnose the following:
-
High-voltage BEC
-
High-voltage low-current fuse
-
High-voltage cables
-
DC/DC
PINPOINT TEST D: DTC P0AFA:13
WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to
depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its
components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage
components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious
personal injury or death.
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D1 CHECK THE HIGH-VOLTAGE BEC HIGH-VOLTAGE LOW-CURRENT FUSE
