F 150 4WD V8-4.6L VIN 8 (2010)
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Is the resistance less than 5 ohms?
Yes
GO to D7.
No
REPAIR circuit CAT19 (BU). CLEAR the DTCs. REPEAT the self-test.
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D7 CHECK THE TBC MODULE FOR MAXIMUM OUTPUT
NOTE: Battery voltage must be greater than 10 volts.
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Ignition OFF.
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Connect: TBC Module C2142.
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Ignition ON.
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Set a gain of 10 in the TBC module.
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NOTE: If the manual slider switch is held to the full left position for more than 5 minutes, the TBC module will automatically shut down.
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Have an assistant press the manual slider switch fully to the left with a gain of 10 on the TBC module.
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Measure the voltage between trailer tow 7-pin trailer tow connector pin-3, circuit CAT19 (BU), harness side and ground.
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Is the voltage greater than 10-12 volts?
Yes
The TBC module is operating correctly. SEND the trailer to an authorized camper/trailer repair center for an overload condition.
No
GO to D8.
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D8 CHECK FOR CORRECT TBC MODULE OPERATION
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Disconnect the TBC module connector.
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Check the connector for:
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corrosion.
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pushed-out pins.