Expedition 2WD V8-5.4L (2009)
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Normal Operation
The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable, circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide
the network connection to all modules on the network.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Audio Control Module (ACM)
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Accessory Protocol Interface Module (APIM)
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Audio Digital Signal Processing (DSP) module (if equipped)
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Audio Rear Control Unit (RCU) (if equipped)
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Dual Climate Controlled Seat Module (DCSM) (if equipped)
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Driver Seat Module (DSM) (if equipped)
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HVAC module (if equipped)
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Instrument Cluster (IC)
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Liftgate/Trunk Module (LTM) (if equipped)
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Parking Aid Module (PAM) (if equipped)
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Power Running Board (PRB) module (if equipped)
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Rear Entertainment Module (RETM) (if equipped)
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Satellite Digital Audio Receiver System (SDARS) module (if equipped)
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Smart Junction Box (SJB)
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Data Link Connector (DLC)
PINPOINT TEST V: NO MS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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V1 CHECK THE DLC PINS FOR DAMAGE
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint
Test. See: Initial Inspection and Diagnostic Overview/Communications Network/Inspection And Verification
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Ignition OFF.
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Disconnect the scan tool cable from the Data Link Connector (DLC).
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Inspect DLC pins 3 and 11 for damage.
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Are DLC pins 3 and 11 OK?
Yes
GO to V2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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V2 CHECK THE MS-CAN TERMINATION RESISTANCE
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Disconnect: Negative Battery Cable.
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Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness
