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This section describes how to use the HDT to see gauge data on the private bus. This
is useful while troubleshooting by determining if the Interface Module is broadcast-
ing data for a particular gauge. If no gauge data is being broadcast for a particular
gauge, the Interface Module may be defective or incorrectly programmed. The HDT
can also be used to compare data from the Interface Module to individual gauge
readings in the instrument system to help determine if the gauge or the Interface
Module is defective.
1. With the ignition off, connect the HDT to the rear of any 2-inch gauge using the
adapter cable as shown in Figure 6-3. Usually the last gauge in the daisy chain
has an unused connector.
2. Turn the ignition on. The HDT will look for the Interface Module and try to es-
tablish communications with it while displaying:
Typically, this process takes less than 30 seconds.
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