E 450 V8-5.4L (2009)
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Connect the scan tool.
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Ignition OFF.
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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 E4.
No
GO to E3.
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E3 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 BOO PID while pressing and releasing the brake pedal.
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Does the PID agree with the brake pedal position?
Yes
REFER to Information Bus to diagnose the HS-CAN bus.
No
REFER to Brake Lamp to diagnose the stoplamp (BPP) switch. See: Lighting and Horns/Brake Lamp/Testing and Inspection
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E4 CHECK THE TBC MODULE OUTPUT
NOTE: Every 4 seconds a voltage pulse is applied as a trailer connectivity test.
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Ignition ON.
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Make sure the brake pedal is not pressed and the manual slider switch is not being applied.
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Measure the voltage between 7-pin trailer tow connector pin-3, circuit CAT19 (BU), harness side and ground.
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Is the voltage approximately 0.3-0.5 volt?
Yes
The TBC module and vehicle wiring are operating correctly. SEND the trailer to an authorized camper/trailer repair center.
No
GO to E5.
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E5 CHECK THE TBC MODULE PWM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
