TROUBLESHOOTING THE HMMWV - OD1616 - LESSON 2/TASK 1
When the cables are connected, a large key on the
cable connector mates with a keyway on the transducer connector or
the VTM connector for proper installation.
If the mechanic
experiences any difficulty during testing and suspects that a cable
is bad, he will refer to TM 9-4910-571-12&P for checking cable
(5) Transducer Kit.
The transducer kit contains a pulse
tachometer transducer, a pressure and a vacuum transducer, and the
necessary adapters (bushing, plugs, tees, etc.).
Also included in
the kit is a current probe for measuring current and a test probe
Before installing any transducer kit item on the vehicle, be sure
that the mounting surfaces are clean. This is particularly important
if the mechanic is going to open fuel lines or tap into manifolds.
Dirt particles entering the engine can cause damage to both the
engine and the transducer kit item.
The transducers should be kept
clean, free of dirt and grease, and handled with reasonable care.
Figure 11 (on the following page) illustrates the transducer kit.
(a) Pressure Transducers.
The pressure transducers have a
small breather hole on the side of the housing which should be kept
unplugged. Do not use high pressure.
(b) Pulse Tachometer.
Make sure that the slotted hole in the
engine tachometer drive shaft is clear and not hard packed before
installing the pulse tachometer.
(c) Threaded Adapters.
Observe threaded fittings carefully to
avoid engaging straight threads with pipe threads. Each measurement
device (transducer) in the transducer kit has its own identification
The VTM uses this identification resistor to check that
the correct transducer is connected for the measurement being made.
If the correct transducer is not connected, error code E002 will be