F 250 4WD Super Duty V8-6.4L DSL Turbo (2008)
Information Bus: Initial Inspection and Diagnostic Overview
Inspection and Verification
INSPECTION AND VERIFICATION
1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
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Battery junction box (BJB) fuse(s)
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5 (30A) (trailer brake control [TBC] module)
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37 (10A) (transmission control module [TCM])
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72 (15A) (TCM)
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71 (5A) (PCM)
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76 (20A) (PCM)
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77 (10A) (anti-lock brake system (ABS) module)
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SJB fuse(s)
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5 (10A) (SJB)
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12 (7.5A) (driver seat module [DSM])
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15 (10A) (electronic automatic temperature control [EATC] module)
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20 (15A) (data link connector [DLC])
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26 (10A) (instrument cluster)
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32 (10A) (restraints control module [RCM])
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33 (10A) (TBC module)
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35 (10A) (parking aid module [PAM])
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36 (5A) (instrument cluster)
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37 (10A) (EATC/EMTC module, supplemental heater control module)
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39 (20A) (audio control module [ACM])
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40 (20A) (DVD player, satellite digital audio receiver system [SDARS] module, 4WD control module)
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43 (10A) (4WD control module)
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DLC
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Wiring, terminals or connectors
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the DLC.
NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
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Check the VCM connection to the vehicle.
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Check the scan tool connection to the VCM.
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GO to Pinpoint Test U, to diagnose no power to the scan tool. See: Pinpoint Tests/Test U: No Power To The Scan Tool
5. NOTE: During the network test, the scan tool will first attempt to communicate with the PCM, after establishing communication with the PCM,
the scan tool will then attempt to communicate with all other modules on the vehicle.
Carry out the network test.
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If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
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If the network test fails, GO to Symptom Chart to identify the module not communicating. See: Symptom Related Diagnostic Procedures
6. If the DTCs retrieved are related to the concern, go to DTC Charts. Follow the non-network DTC diagnostics (B-codes, C-codes, P-codes) prior to
the network DTC diagnostics (U-codes). For all other DTCs, refer to Body Control Systems (Multifunction Electronic Control Module). See:
Diagnostic Trouble Code Descriptions/Module Communications Network
7. If no DTCs related to the concern are retrieved, verify the symptom, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
Principles of Operation
PRINCIPLES OF OPERATION
