Hombre XS Space Cab 2WD V6-4.3L (1998)
Information Bus: Component Tests and General Diagnostics
Data Link Connector Diagnosis
Circuit Description
The Class II Serial Data circuit to the DLC allows bi-directional communication between the VCM and the scan tool. This is accomplished
through pin 2 of the DLC. If communication between the scan tool and the VCM cannot be established, the procedure in the DLC Diagnosis table
should be used to diagnose the condition.
Diagnostic Aids
Check for the following items:
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For the VCM to establish communication with the scan tool, system voltage must be between 9.0 and 16.0 volts. If the system voltage is not
within this range, refer to Charging System for diagnosis.
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Ensure that the correct application (model year, truckline, VIN code) has been selected on the scan tool.
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An intermittent may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation. Check for a poor
connections or a damaged harness. Inspect the VCM harness and the connectors for improper mating, broken locks, improperly formed or
damaged terminals, poor terminal to wire connection, and damaged harness.
Test Description