2-42. DCA TROUBLESHOOTING
These DCA tests can be run anytime you think there is a problem with the vehicles DCA or its
on board transducers. Do not use this paragraph to test the STE/lCE-R and its cables and
transducers. Refer to TM 9-4910-571-12&P to test the STE/ICE-R. This paragraph will also
supply instructions on how to use the STE/lCE-R in the TK mode to substitute for tests run
through the DCA.
The HMMWV is equipped with three transducers - the pulse tachometer, the fuel pressure
transducer, and the current shunt. A power test (12, 13) or RPM test (10) uses the pulse
tachometer. The fuel pressure test (24) uses the pressure transducer. All of the starting circuit
tests and battery tests done through the DCA use the shunt. Check to see that the wires are
connected to the transducer for the test youre trying to run. There is a four wire connector for
the fuel pressure transducer, a two wire connector for the pulse tachometer, and there are four
wires connected to the shunt in addition to the battery cables.
The fold-out page FO-16 gives a cross reference between DCA tests and TK tests. Use this
cross reference to find out how to substitute TK tests for DCA tests if you have a bad DCA. The
Location of Parts page has a schematic of the HMMWV DCA.