F 150 4WD V8-4.6L VIN 8 (2010)
PINPOINT TEST AE: THE TRAILER ELECTRIC BRAKES ARE INOPERATIVE/ALWAYS APPLIED
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Before beginning diagnostics, visually inspect the trailer tow connector for signs of corrosion or damage. Repair or install a new trailer tow
connector as required.
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AE1 CHECK THE TRAILER ELECTRIC BRAKE CONTROLLER FOR A SHORTED OUTPUT
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Ignition ON.
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With the brake pedal released, measure the voltage between the trailer tow connector pin 3, circuit CAT19 (BU), component side and ground.
-
Is any voltage present?
Yes
GO to AE2.
No
GO to AE3.
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AE2 CHECK THE TBC MODULE OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE
-
Disconnect: TBC Module C2142.
-
Measure the voltage between the trailer tow connector pin 3, circuit CAT19 (BU), component side and ground.
-
Is any voltage present?
Yes
REPAIR circuit CAT19 (BU) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new TBC module. TEST the system for normal operation.
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AE3 CHECK THE TBC MODULE OUTPUT
