TM-5-2350-378-24-P
HYDRAULIC DIAGNOSTIC CENTER (HDC) SUPPORTING ARMORED COMBAT EARTHMOVER (ACE), M9
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
TM-5-2350-378-24-P - Page 525 of 790
TM 5--2350--378--24&P
0022 00--42
APPARENT HDC SYSTEM PROBLEM -- Continued
0022 00
YES
YES
from block 74
76
Disconnect the applicable W2 or W3 cable assembly electrical
lead going to the electrical connector of the pressure transducer
identified in the “CIRCUIT FAULT” message.
Reference the individual cable assembly wiring schematic
diagrams (for cable assemblies W2 through W4) in FP--23
through FP--28, and the HDC control box connectors pin number
signal names information in WP 0005 00, and trace the signal
path for the “CIRCUIT FAULT” pressure transducer reference
voltage (15 VDC) from a connector on the HDC control box (J2 or
J3) to a connector on the umbilical disconnect bracket (W2J1 or
W3J1), through the applicable umbilical cable connector W4P5 or
W4P6, respectively.
Disconnect umbilical cable connector W4P5 or W4P6 (as
applicable) associated with “CIRCUIT FAULT” pressure
transducer from cable assembly W2J1 or cable assembly W3J1
(as applicable) connector on umbilical disconnect bracket.
Perform continuity test and check for short circuit to cable ground
(connector case/shell) for the two pins/wires in the embedded
cable assembly (W2J1 or W3J1, as applicable) that route the 15
VDC reference voltage from the HDC control box to the pressure
transducer associated with the “CIRCUIT FAULT” message. (15
VDC reference voltage is applied between pins 1 and 2 on the
5--pin hydraulic pressure transducer electrical connector J1 on all
pressure transducers. The DC voltage representing the hydraulic
pressure measured by the pressure transducer is returned to the
HDC control box between pins 4 and 5 on the transducer
electrical connector J1).
Does an open circuit or short circuit exist in the cable assembly
W2 or W3 wiring circuit (”CIRCUIT FAULT” pressure transducer
15 VDC reference circuit) being checked? (Refer to FP--23
through FP--26, for wiring schematic diagrams of electrical cable
assemblies W2 and W3.
To block 78
NO
NO
77
Replace embedded cable assembly (W2 or W3, as
applicable) associated with designated “CIRCUIT
FAULT” pressure transducer 15 VDC reference
voltage circuit wiring.
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