TM-5-2350-378-23-P
ARMORED COMBAT EARTHMOVER (ACE), M9; HYDRAULIC DIAGNOSTIC CENTER
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JUNE 2012
TM-5-2350-378-23-P - Page 322 of 644
APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
STEP
11.
Check cable W4P1-A and W4P4-A pins for short circuit to cable W4 connector pin B or to W4 connector shell
(Figures 12 and 13).
CONTROL BOX
CONNECTOR J3
UMBILICAL CABLE
CONNECTOR W4P1
UMBILICAL CABLE
CONNECTOR W4P2
HDC
CONTROL BOX
T01912HDC
CONTROL BOX
CONNECTOR J1
UMBILICAL CABLE
CONNECTOR W4P3
CONTROL BOX
CONNECTOR J2
Figure 12.
Umbilical Cable Assembly W4 Connections to Hydraulic Diagnostic Center (HDC) Control Box.
W2J1
UMBILICAL CABLE
ASSEMBLY W4
W4P6
W3J1
T01913HDC
W1J1
UMBILICAL CABLE
DISCONNECT
PANEL
W4P4
W4P5
Figure 13.
Umbilical Cable Assembly W4 Connection to Umbilical Cable Disconnect Bracket.
CONDITION/INDICATION
Does a short circuit exist in umbilical cable W4 at W4P1-A or W4P4-A?
DECISION
YES - Replace umbilical cable W4.
NO - Reconnect umbilical cable W4, tighten all HDC system connectors securely, and check vehicle 28 VDC
power circuits.
TM 5-2350-378-23&P
0021
0021-10
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