TM 5-2350-378-23&P
0021
APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
STEP
36.
Substitute a spare (good) solenoid valve with "CIRCUIT FAULT" solenoid valve and repeat test.
CONDITION/INDICATION
ARE RESULTS SAME?
DECISION
YES - Replace HDC control box. Resume HDC system functional check-out (WP 0025) .
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).
STEP
37.
Check if CIRCUIT FAULT appears after faulty transducer is replaced with known good transducer.
a.
If here, "CIRCUIT FAULT" message is associated with a pressure transducer (upper LCD screen
display).
b.
Power off HDC system.
c.
Tag W2 or W3 cable assembly electrical lead to hydraulic pressure transducer identified in "CIRCUIT
FAULT" message and switch electrical leads with another (or spare) hydraulic pressure transducer. If a
spare of another pressure transducer is not nearby, temporarily exchange identified pressure transducer
with another pressure transducer from elsewhere in vehicle.
d.
Power up HDC system again.
e.
Power off HDC system.
f.
If a "good" pressure transducer was switched with another pressure transducer to check out first
transducer, make sure good transducer is returned to original location.
g.
Reconnect proper electrical leads and ensure all W2 or W3 electrical leads are mated with proper
pressure transducer.
0021-28
03/15/2011Rel(1.8)root(tswp)wpno(T00019)
