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A vacuum transducer module (VTM) contains two vacuum transducers. The VTM is
used for the Air Filter Restriction and Fuel Filter Restriction gauges. The VTM must
be mounted at port 5A/5B only.
The vacuum transducers are not identical. The Air Filter Restriction end must go to
port 5A, and the Fuel Filter Restriction end must go to port 5B as shown in Figure 3-
4.
Two types of combination modules are available. One type contains a pressure trans-
ducer and an Air Restriction transducer; the other type contains a pressure trans-
ducer and a Fuel Filter Restriction transducer. Combination modules are not
interchangeable and are mounted at port 5A/5B. If used, the Air Filter Restriction
end must go to port 5A, and the Fuel Filter Restriction end must go to port 5B as
shown in Figure 3-4.
The J1708 data bus is a public data bus consisting of a pair of twisted-wires. It allows
electronic devices and other equipment in the vehicle to send and receive data. The
two wires making up the J1708 data bus are part of the vehicle's wiring harness. Be-
cause it connects to many different components in widely separated locations, a
problem with the data bus or with one of the component's connected to it can some-
times be hard to isolate. For a complete description of the J1708 data bus and data
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