Pinpoint Test L: DTC P0A1F - Battery Energy Control Module Has Internal Errors
High-Voltage Traction Battery
Pinpoint Tests
Pinpoint Test L: DTC P0A1F - Battery Energy Control Module has Internal Errors
Refer to Wiring Diagram Set 12 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Charging System for schematic and connector information. Diagrams By Number
Normal Operation
With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the key was cycled to ON), the Battery Control Module (BCM) monitors the current, voltage, temperature and leakage resistance of the 50 individual nickel metal hydride battery modules within the High Voltage Traction Battery (HVTB). The BCM also controls the contactors.
- DTC P0A1F Battery Energy Control Module Has Internal Errors - If there are any internal errors of the HVTB caused by sensor failure, control module failure or other serious related faults internal to the HVTB will cause the BCM to set this DTC.
This pinpoint test is intended to diagnose the following:
- Service disconnect plug
- HVTB
PINPOINT TEST L: DTC P0A1F - BATTERY ENERGY CONTROL MODULE
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L1 CHECK THE SERVICE DISCONNECT PLUG
WARNING: Wear high-voltage insulated safety gloves and a face shield when working with high-voltage batteries or cables. The high-voltage insulated safety gloves should be of the appropriate safety and protection rating. Inspect the gloves before use and always wear them with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high-voltage. Failure to follow these instructions may result in serious personal injury or death.
WARNING: Turn OFF the ignition switch for a minimum of 5 minutes before removing high-voltage cables. High-voltage cables and wiring are orange in color. The nominal high-voltage traction battery voltage (HVTB) is 330 V DC. Failure to follow these instructions may result in serious personal injury or death.
WARNING: Depower the high-voltage traction battery (HVTB) before carrying out any removal or installation procedures affecting the high-voltage battery system. Failure to follow this instruction may result in serious personal injury or death.
WARNING: When servicing the high-voltage system, establish a buffer zone per the specified procedure. Failure to follow this instruction may result in serious personal injury or death.
NOTE: Make sure the service disconnect plug is correctly inserted and locked into the lock position.
- Ignition OFF.
- Disconnect: Service Disconnect Plug.
- Inspect the service disconnect plug for physical or electrical damage. Make sure that the HV fuse resistance is one ohm or less. If the HV fuse is open, refer to DTC P0A95 for instructions. Diagnostic Trouble Code Tests and Associated Procedures
- Is the service disconnect plug free of any damage?
Yes
GO to L2.
No
REFER to DTC P0A95 action in the Battery Control Module (BCM) DTC Chart. Diagnostic Trouble Code Tests and Associated Procedures
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L2 CHECK THE BCM DTCs
- Check the recorded BCM DTCs from the continuous and on-demand self tests.
- Are any or all of the DTCs P0A8B, P0A8D, P0A8E also present?
Yes
Go To Pinpoint Test E. Pinpoint Test E: DTCs P0A8B, P0A8D And P0A8E - 14-Volt Power Module System Voltage
No
GO to L3.
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L3 CHECK FOR CORRECT BCM OPERATION
NOTE: This pinpoint test step only addresses the 6-pin and 40-pin connectors for the BCM. It is not necessary to disconnect the high-voltage connectors when following this pinpoint test step procedure.
- Disconnect BCM electrical connector C4227a.
- Check for:
- corrosion.
- pushed-out pins.
- Connect BCM electrical connector C4227a and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new HVTB. REFER to High-Voltage Traction Battery High-Voltage Traction Battery. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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