Pinpoint Test W: DTC P0AFD:00

High-Voltage Traction Battery

Pinpoint Test W: DTC P0AFD:00

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

With the ignition in the ON position and the engine ON or OFF, the Battery Pack Sensor Module (BPSM) monitors and maintains the High Voltage Traction Battery (HVTB) temperature in a specific range. A thermistor is mounted to the inlet air duct which monitors inlet air temperature along with thermistors inside the HVTB which monitor HVTB temperature. The ideal HVTB temperature is 25°C (77°F) with a desired range of 20°C (68°F) to 30°C (86°F). The HVTB is not designed to operate in temperatures below -40°C (-40°F). The Battery Energy Control Module (BECM) controls the temperature by adjusting the HVTB cooling fan speed. The BPSM communicates the HVTB and inlet air temperature to the BECM through a dedicated Controller Area Network (CAN).

- P0AFD:00 (Hybrid Battery Pack Temperature Too Low: No Sub Type Information) - Fault code sets if a thermistor within the battery senses temperature inside the battery was -40°C (-40°F).

This pinpoint test is intended to diagnose the following:

- BPSM
- HVTB


PINPOINT TEST W: DTC P0AFD:00

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.

WARNING: Always inspect gloves before each use to prevent high-voltage shock. High-voltage insulated safety gloves with a leather outer glove are required to service some components of this vehicle where specified in the service procedures. All high-voltage insulated safety gloves must meet or exceed ANSI/ASTM class 00. Refer to Rubber Insulating Gloves Testing Rubber Insulating Gloves Testing. Failure to follow these instructions may result in serious personal injury or death.

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

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W1 MEASURE THERMISTOR RESISTANCE FROM BPSM

WARNING: Always wear high-voltage insulated safety gloves with leather outer gloves and a face shield when servicing the battery pack sensor module (BPSM) and never remove the high-voltage BPSM connector unless directed by a service procedure. High voltage is present at the BPSM at all times, even with service disconnect plug removal. Depowering the system will not remove voltage from the BPSM connector with the orange harness. Follow all service instructions. Failure to follow these instructions may result in serious personal injury or death.

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 system. Refer to High-Voltage Traction Battery Systems Depowering High-Voltage Traction Battery Systems Depowering.
- Remove the high-voltage Bussed Electrical Center (BEC) cover. Refer to the exploded view in Battery Pack Sensor Module (BPSM) Service and Repair.
- Disconnect: BPSM C4238B.
- Measure the resistance of each of the thermistors located within the HVTB. Use the following charts to determine pin location and expected resistance values.

Connector Pins














- Are the resistance values correct for the temperature?

Yes
INSTALL a new BPSM. REFER to Battery Pack Sensor Module (BPSM) Service and Repair. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new HVTB (includes HVTB system wire harness). REFER to High-Voltage Traction Battery High-Voltage Traction Battery. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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