E 450 V8-5.4L (2009)
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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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 SBB18 (YE/RD), harness side.
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TBC module C2142-12, circuit CBP33 (WH/BN), harness side.
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Are the voltages greater than 10 volts?
Yes
GO to D5.
No
VERIFY BJB fuse 18 (30A) is OK. If OK, REPAIR circuit SBB18 (YE/RD).
VERIFY SJB fuse 33 (10A) is OK. If OK, REPAIR circuit CBP33 (WH/BN).
If either fuse is not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short.
CLEAR the DTCs. REPEAT the self-test.
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D5 CHECK THE TBC MODULE GROUND CIRCUIT FOR AN OPEN
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Ignition OFF.
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Measure the resistance between TBC module C2142-11, circuit GD116 (BK/VT), harness side and ground.
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Is the resistance less than 5 ohms?
Yes
GO to D6.
No
REPAIR circuit GD116 (BK/VT). CLEAR the DTCs. REPEAT the self-test.
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