TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 821 of 890
TM 9-2320-280-20-1 2-42. DCA TROUBLESHOOTING These DCA tests can be run anytime you think there is a problem with the vehicle’s 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 you’re 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. 2-723