Crown Victoria V8-281 4.6L SFI (1998)
instrument panel and select the vehicle to be tested from NGS Tester menu. If NGS Tester does not communicate with the vehicle:
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Check that the program card is properly installed.
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Check the connections to the vehicle.
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Check the ignition switch position.
If NGS Tester still does not communicate with the vehicle, go to Pinpoint Test M. See: Pinpoint Tests/M: No Module/Network
Communication
Diagnostic Communication Network
The diagnostic communication network:
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consists of a single wire, Circuit 70 (LB/W).
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provides a common link for communication to an off-board tester through the Data Link Connector (DLC) located under the instrument panel to
the right of the steering column.
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does not allow module-to-module communications.
The micro-processor based subsystems included on this network are:
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supplemental air bag system
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keyless entry
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power locks and windows
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interior lighting control
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warning indicator control
Fault Tolerance
The diagnostic communication network will fail if any of the following occur:
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Circuit 70 (LB/W) shorted to ground.
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Circuit 70 (LB/W) shorted to battery positive voltage (B+).
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the module loses power or ground supply.
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a module failure shorts the communication network internally.
Purpose
The information is designed to diagnose any diagnostic communication network concerns. These concerns may:
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affect normal functional operations of the vehicle.
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be directly related to customer concerns.
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be undetectable except during diagnostics.
To properly diagnose a network concern, follow the diagnostic procedure in the order presented.
