APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
Perform HDC system functional check-out (WP 0025).
Can HDC system functional check-out be performed successfully?
YES - HDC system appears to be functioning properly and ready to aid in troubleshooting the M9 ACE hydraulic
system. If this functional checkout was performed as part of weekly HDC system PMCS (WP 0023), power off
HDC system, disconnect it from vehicle, and stow HDC control box and umbilical cable W4. If this functional
checkout was performed prior to troubleshooting a problem in vehicle hydraulic system using HDC system, refer
to applicable problem symptom work package as applicable and proceed as indicated (WP 0005).
NO - Go to Step (2).
Check installation of HDC control box and umbilical cable W4. Check for clean and secure HDC system ground
connection in vehicle (Figures 1, 2, and 3).
Umbilical Cable Assembly W4 Connection to Umbilical Cable Disconnect Bracket.