Ranger 2WD V6-3.0L (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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9 (40A) (no communication with the smart junction box [SJB])
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21 (10A) (no communication with the PCM)
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39 (15A) (no communication with the PCM)
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SJB fuse(s):
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8 (10A) (no communication with the restraints control module [RCM], occupant classification system module [OCSM])
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9 (5A) (no communication with the instrument cluster [IC])
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10 (10A) (no communication with the IC, 4X4 control module)
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11 (10A) (no communication with the SJB)
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20 (10A) (no communication with the ABS module)
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28 (15A) (no power to the 4X4 control module)
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29 (20A) (no power to the scan tool)
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33 (5A) (no communication with the IC)
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Data link connector (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 I, to diagnose No Power To The Scan Tool. See: Pinpoint Tests/Test I: 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. 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, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
Principles of Operation
PRINCIPLES OF OPERATION
NOTE: The smart junction box (SJB) is also known as the generic electronic module (GEM).
Vehicle communication utilizes both International Standards Organization (ISO) 9141 and controller area network (CAN) communications. ISO 9141 is
used for diagnostic use only, and CAN is a method for transferring data among distributed electronic modules via a serial data bus.
The vehicle is equipped with 2 communication networks:
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ISO 9141
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High speed (HS) CAN
