E 450 V8-5.4L (2009)
TBC module, the TBC module will enter a limited operating mode. The TBC module receives fused battery voltage from Battery Junction Box (BJB)
fuse 18 (30A) along circuit SBB18 (YE/RD) and fused ignition voltage from Smart Junction Box (SJB) fuse 33 (10A) along circuit CBP33 (WH/BN).
The ground path for the TBC module is along circuit GD116 (BK/VT).
This pinpoint test is intended to diagnose the following:
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Fuse(s)
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Wiring, terminals or connectors
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ABS module
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TBC module
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Customer trailer
PINPOINT TEST D: WHEN THE IGNITION KEY IS TURNED TO THE RUN POSITION, THE TBC MODULE DISPLAY DOES LIGHT
UP/PROVE OUT BUT THE TRAILER BRAKES ARE INOPERATIVE
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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. See: Antilock Brakes / Traction Control Systems/Testing and Inspection
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 BOO PID while pressing and releasing the brake pedal.
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Does the PID agree with the brake pedal position?
Yes
