Pinpoint Test D: DTCs P0A81 And P0A96 - Hybrid Battery Pack Cooling Fans 1 And 2 Control Circuits
High-Voltage Traction Battery
Pinpoint Tests
Pinpoint Test D: DTCs P0A81 and P0A96 - Hybrid Battery Pack Cooling Fans 1 and 2 Control Circuits
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 started at least once after the key was cycled to ON), 2 internal fans in the High Voltage Traction Battery (HVTB) circulate air to maintain a specific temperature range. A failure of the cooling fan(s) or their associated circuits causes one (or both) of the DTCs to be set.
- P0A81 Hybrid Battery Pack Cooling Fan 1 Control Circuit - An open in Battery Junction Box (BJB) fuse 15 (50A), an HVTB cooling fan 1 fault or circuit SBB15 (WH/RD) feedback status does not match Battery Control Module (BCM) commands or an open or high resistance on HVTB ground circuit GD149 (BK/GY) causes the BCM to set this DTC.
- P0A96 Hybrid Battery Pack Cooling Fan 2 Control Circuit - An open in BJB fuse 15 (50A), an HVTB cooling fan 2 fault or circuit SBB15 (WH/RD) feedback status does not match BCM commands or an open or high resistance on HVTB ground circuit GD149 (BK/GY) causes the BCM to set this DTC.
This pinpoint test is intended to diagnose the following:
- Fuse
- Circuitry
- Cooling fan 1 or 2 (part of HVTB)
- HVTB
PINPOINT TEST D: DTC P0A81 AND P0A96 - HYBRID BATTERY PACK COOLING FANS 1 AND 2 CONTROL CIRCUITS
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D1 VERIFY THE HVTB INTERNAL FANS ARE OPERATIONAL
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.
- Enter the following diagnostic mode on the scan tool: BCM Self Test/Retrieve and Record On-Demand and Continuous Memory DTCs.
- NOTE: Use a stethoscope or equivalent listening device to probe the HVTB area.
- NOTE: The cooling fans may cycle on or off with the key ON, engine ON or OFF.
- 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), verify the HVTB internal fans are operating correctly.
- Are the HVTB internal fans operating correctly?
Yes
INSTALL a new HVTB. REFER to High-Voltage Traction Battery High-Voltage Traction Battery. TEST the system for normal operation.
No
TURN the ignition OFF, then GO to D2 .
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D2 CHECK CIRCUIT SBB15 (WH/RD) FOR VOLTAGE
- Ignition OFF.
- Disconnect: BCM C4227a.
- Measure the voltage between BCM C4227a pins, harness side and ground as follows:
- Is the voltage greater than 10 volts?
Yes
GO to D3.
No
VERIFY that the BJB fuse 15 (50A) is OK; if OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D3 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN
- Measure the resistance between BCM C4227a pins, harness side and ground as follows:
- Is the resistance less than 5 ohms?
Yes
GO to D4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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D4 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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