F 150 4WD V8-4.6L VIN 8 (2010)
NOTE: Make sure the trailer brakes are electric-magnet actuated drum-type brakes before proceeding with this pinpoint test.
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D1 CHECK FOR ANY ABS MODULE DTCs
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Connect the scan tool.
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Ignition ON.
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Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
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Retrieve and record any ABS module DTCs.
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Are any ABS module DTCs retrieved?
Yes
REFER to Antilock Brakes / Traction Control Systems.
No
GO to D2.
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D2 CHECK THE TBC BRAKE ON/OFF (BOO_TBC) PID
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Enter the following diagnostic mode on the scan tool: DataLogger - TBC Module.
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Monitor the BOO_TBC PID while pressing and releasing the brake pedal.
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Does the PID agree with the brake pedal position?
Yes
GO to D4.
No
GO to D3.
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D3 CHECK THE PCM BOO PID
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Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
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Monitor the BOO1 and BOO2 PIDs while pressing and releasing the brake pedal.
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Do the PIDs agree with the brake pedal position?
Yes
REFER to Information Bus to diagnose the HS-CAN bus.
No
REFER to Lighting and Horns to diagnose the stoplamp (BPP) switch.
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D4 CHECK THE VOLTAGE TO THE TBC MODULE
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Ignition OFF.
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Disconnect: TBC Module C2142.
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Ignition ON.
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Measure the voltage between ground and:
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TBC module C2142-8, circuit SBB17 (RD), harness side.
