TM 5-2350-378-23&P
0021
APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
DECISION
YES - Go to Step (32).
NO - HDC system appears to have passed start-up BIT. Continue to perform HDC system functional check-
out (WP 0025) .
STEP
32.
Check what CIRCUIT FAULT message is associated with.
CONDITION/INDICATION
Is CIRCUIT FAULT message associated with a solenoid valve? (CIRCUIT FAULT message is displayed on
hydraulic valve status LCD screen (lower LCD display))?
DECISION
YES - Go to Step (33).
NO - Go to Step (38).
STEP
33.
If "CIRCUIT FAULT" message is associated with a solenoid valve (lower LCD screen display).
a.
Power off HDC system.
b.
Tag W2 or W3 cable assembly electrical lead to HDC system solenoid valve (on HDC system primary
manifold, right forward manifold, left forward manifold, or aft manifold, as applicable) identified in
"CIRCUIT FAULT" message and switch electrical leads with another (identical type) solenoid valve on
same manifold assembly.
c.
Power up HDC system again.
d.
Power off HDC system.
e.
If a "good" solenoid valve was switched with another valve to check out first valve, make sure good valve
is returned to original location.
f.
Reconnect proper electrical leads and ensure all W2 or W3 electrical leads are mated with proper
solenoid valves.
CONDITION/INDICATION
Does lower LCD screen display same CIRCUIT FAULT message (identifying same solenoid valve as previous
CIRCUIT FAULT message)?
DECISION
YES - Go to Step (34).
NO - Replace applicable HDC system solenoid valve identified in first "CIRCUIT FAULT" message on forward
left manifold (WP 0036).
NO - Replace applicable HDC system solenoid valve identified in first "CIRCUIT FAULT" message on forward
right manifold (WP 0037).
NO - Replace applicable HDC system solenoid valve identified in first "CIRCUIT FAULT" message on HDC aft
manifold (WP 0038).
NO - Replace applicable HDC system solenoid valve identified in first "CIRCUIT FAULT" message on HDC
primary manifold (WP 0034).
0021-23
03/15/2011Rel(1.8)root(tswp)wpno(T00019)
