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Home >> Ford >> 2012 >> Econoline Base, Van Cargo >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 51 (Auxiliary Brake System) >> Diagnosis And Testing >> Auxiliary Brake System - Trailer Brake Control (TBC) Module >> Inspection and Verification

Inspection and Verification

WARNING: This page is about a different variant/trim than selected.
NOTE: A trailer brake emulator tool is available to verify that the Trailer Brake Control (TBC) module and vehicle wiring are functioning correctly.
  1. Verify the customer concern.
    2. NOTE: The TBC system does not function with electric-over-hydraulic or surge trailer brake types.
  2. Verify that the trailer brakes are electric-actuated drum type brakes.
  3. Verify that the yellow ABS warning indicator shuts off after prove out. If the warning indicator operates correctly, proceed to the next step. If the warning indicator remains illuminated, GO to ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL to diagnose the warning indicator.
  4. Verify the vehicle stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position and the trailer disconnected. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING . If the vehicle stoplamps operate correctly, proceed to the next step.
  5. Visually inspect for obvious signs of mechanical or electrical damage.
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Base brake system
    • Brake Pedal Position (BPP) switch
    • Brake pressure transducer (vehicles equipped with a TorqShift transmission)
    • Hydraulic Control Unit (HCU)
    • Trailer
    • Battery Junction Box (BJB) fuse 18 (30A)
    • Smart Junction Box (SJB) fuse 33 (10A)
    • Trailer Brake Control (TBC) module
    • Wiring, terminals or connectors
  6. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    7. NOTE: Make sure to use the latest scan tool software release.
  7. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    8. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  8. If the scan tool does not communicate with the VCM:
    • check the VCM connection to the vehicle.
    • check the scan tool connection to the VCM.
    • refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no power to the scan tool.
  9. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the PCM.
  10. Carry out the network test.
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
    • If the network test passes, retrieve and record Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  11. Clear the CMDTCs and carry out the self-test diagnostics for the TBC module.
  12. If the DTCs retrieved are related to the concern, go to the Trailer Brake Control (TBC) Module DTC Chart . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
  13. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART .
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