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Home >> Mercury >> 2011 >> Milan FWD L4-2.5L Hybrid >> Repair and Diagnosis >> Starting and Charging >> Power and Ground Distribution >> Auxiliary Power Outlet >> Testing and Inspection >> Pinpoint Tests >> Pinpoint Test D: DTC P0AFA:13

Pinpoint Test D: DTC P0AFA:13




High-Voltage Converter/Inverter

Pinpoint Test D: DTC P0AFA:13

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

WARNING: Never install the service disconnect plug with the high-voltage bussed electrical center (BEC) cover removed. Always install the cover prior to connecting the service disconnect plug. The high-voltage BEC cover prevents inadvertent contact with the high voltage which is present at several points under the cover. Failure to follow these instructions may result in serious personal injury or death.

- Ignition OFF.
- Depower the HVTB. Refer to High Voltage Traction Battery High-Voltage Traction Battery Systems Depowering.
- Remove the high-voltage BEC cover. Refer to the High-Voltage Low-Current Fuse procedure in High Voltage Traction Battery Service and Repair.
- Inspect and measure the resistance of the high-voltage low-current fuse.




- Is the fuse undamaged and the resistance less than 5 ohms?

Yes
GO to D2.

No
INSTALL a new high-voltage, low-current fuse. INSPECT the high-voltage BEC for signs of an obvious short condition. INSTALL a new high-voltage BEC as needed. If an obvious short condition is not identified, CARRY OUT self-test of the Battery Energy Control Module (BECM). REFER to High Voltage Traction Battery Testing and Inspection to diagnose BECM DTCs.

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D2 CARRY OUT TESTING OF THE HIGH-VOLTAGE CABLES

- Disconnect: DC/DC C1457A.
- Disconnect: High-Voltage BEC C4236A.
- Measure the resistance between DC/DC C1457A, harness side and high-voltage BEC C4236A, harness side as follows:









- Are the resistances less than 5 ohms?

Yes
GO to D3.

No
INSTALL new high-voltage cables. REFER to High Voltage Traction Battery Service and Repair. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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D3 CHECK HIGH VOLTAGE TO THE TCM USING PID BATTERY VOLTAGE (TCM) RECEIVED (HVBAT_V)

- Connect: DC/DC C1457A.
- Connect: High-Voltage BEC C4236A.
- Install the HVTB service disconnect. Refer to High Voltage Traction Battery High-Voltage Traction Battery.
- Ignition ON.
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: DataLogger - TCM.
- Monitor the TCM PID HVBAT_V.
- Does the PID read greater than 150 volts?

Yes
GO to D4.

No
GO to D5.

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D4 CHECK HIGH VOLTAGE TO THE DC/DC USING PID HEV HIGH VOLTAGE BUS-MEASURED (HEVHiVolt)

- Enter the following diagnostic mode on the scan tool: DataLogger - DC/DC.
- Monitor the DC/DC PID HEVHiVolt.
- Does the PID read greater than 150 volts?

Yes
GO to D5.

No
INSTALL a new DC/DC. REFER to Direct Current/Direct Current (DC/DC) Converter Service and Repair. REPEAT the self-test. TEST the system for normal operation.

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D5 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 P0AFA:13 reported?

Yes
INSTALL a new DC/DC. REFER to Direct Current/Direct Current (DC/DC) Converter Service and Repair. 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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