Table 2-15. Transducer ID Numbers

TM 9-2320-279-20-1

Instructions (Cent)

operating Modes. The two basic modes in which the

system is operated are the

mode, and the Transducer Kit (TK) mode. The DCA and TK can also

Diagnostic Connector Assembly

be operated together in a combined mode.

Mode. In the DCA mode, the VTM is connected to a diagnostic connector assembly installed

in the vehicle. The diagnostic connector, which is located in the cab, terminates a wiring harness routed

throughout the vehicle. The wires in the harness connect to test points on the vehicle and also to the

vehicle's battery system. The connector and harness are a permanent part of the vehicle.

In the TK mode, the VTM is connected to the vehicle using adapters, transducers, and

cable assemblies contained in the Transducer Kit. The transducers are installed in place to make the tests

and are removed when testing is completed. One or more cables are required to connect the required

points and supply power to the VTM.

Combined Mode. The DCA and the TK can be used at the same time. This maybe necessary when

the diagnostic connector assembly has a missing transducer. If a transducer is missing, a no sensor

is displayed when a measurement is made. If this happens, the TK mode can be used to

indication

make the measurement.

The

system was developed as a tool for the mechanic to use in testing

both electrical and mechanical components on vehicles.

At the beginning of testing it is necessary for the operator to enter vehicle

Card will tell what data is required. The reason for entering

information into the VTM. The Vehicle

13, 14, and 15

data is that certain tests require vehicle or cylinder information to be done properly.

require VID information. If the VID is entered, the number of cylinders is automatically entered.

Cylinder

58). In this test, the number of cylinders or number of cylinder parts is

entered. If the operator does not know what number to enter, it can be found on the VTC or the flip card

on the VTM. The VTM's response to test 58 is display CYL. This is the signal to dial the number of cylinders

into the TEST SELECT switches and press the TEST button. The VTM will not try to perform a test, it just

remembers the number of cylinders. If there is a problem with the number that was entered, one of the

These messages are described in

following error messages will be displayed: EO07, EO1O,

2-13.

Vehicle

In this test the Vehicle identification number is entered. This number

is given on the VTC and, for the M977 series vehicles, is number 18. The VTM's response to test 60 is to

display UEE. This is the signal to dial the VID number (18) into the TEST SELECT switches and press the

TEST button. The VTM will not try to perform a test, it just remembers the VID. If there is a problem with

the number entered, error message EO07 or EO1O will be displayed. These messages are described in

2-14.

(2) Data Display

59, 61-64). These tests are used to read out data previously stored in the

VTM.

59 displays currently stored cylinder information when the TEST button is pressed.

62 displays the

displays the currently stored Vehicle ID number when the TEST button is pressed.

currently attached DCA ID number when the TEST button is pressed (06 for M977 series vehicles).

64 displays the ID of the

displays the ID of the currently attached transducer on connector J2.

2-15 for transducer ID numbers.

currently attached transducer on connector J3. Refer to

Table 2-15. Transducer ID Numbers

Transducer attached to J2 or J3

ID number displayed by test 63 or 64

Pressure transducer -15 to +25 PSIG (red stripe)

Pressure transducer 0-1000 PSIG (blue stripe)

Pulse tachometer

Current Probe